CN107328906A - The assay method of total organic content in a kind of water - Google Patents
The assay method of total organic content in a kind of water Download PDFInfo
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- CN107328906A CN107328906A CN201710735253.7A CN201710735253A CN107328906A CN 107328906 A CN107328906 A CN 107328906A CN 201710735253 A CN201710735253 A CN 201710735253A CN 107328906 A CN107328906 A CN 107328906A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 140
- 238000003556 assay Methods 0.000 title claims abstract description 15
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 34
- 239000005416 organic matter Substances 0.000 claims abstract description 29
- 238000001764 infiltration Methods 0.000 claims abstract description 20
- 238000005245 sintering Methods 0.000 claims abstract description 14
- 238000005516 engineering process Methods 0.000 claims abstract description 7
- 239000000284 extract Substances 0.000 claims abstract description 4
- 239000012528 membrane Substances 0.000 claims description 18
- 238000001354 calcination Methods 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 7
- 230000008595 infiltration Effects 0.000 claims description 6
- 238000004108 freeze drying Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000007710 freezing Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 239000002352 surface water Substances 0.000 claims description 4
- 239000012498 ultrapure water Substances 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 230000008014 freezing Effects 0.000 claims description 3
- 239000004760 aramid Substances 0.000 claims description 2
- 229920003235 aromatic polyamide Polymers 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 238000010612 desalination reaction Methods 0.000 claims description 2
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 2
- 229910052573 porcelain Inorganic materials 0.000 claims description 2
- 238000000859 sublimation Methods 0.000 claims description 2
- 230000008022 sublimation Effects 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 239000003651 drinking water Substances 0.000 abstract description 4
- 235000020188 drinking water Nutrition 0.000 abstract description 4
- 239000002574 poison Substances 0.000 abstract description 2
- 231100000614 poison Toxicity 0.000 abstract description 2
- 238000004445 quantitative analysis Methods 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 11
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 10
- 238000005303 weighing Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 description 1
- 238000000944 Soxhlet extraction Methods 0.000 description 1
- 208000031320 Teratogenesis Diseases 0.000 description 1
- BJNXJPYKYOKYOR-UHFFFAOYSA-N [C].ClC(Cl)Cl Chemical class [C].ClC(Cl)Cl BJNXJPYKYOKYOR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 238000009298 carbon filtering Methods 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000002026 chloroform extract Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000004021 humic acid Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 238000001819 mass spectrum Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002703 mutagenesis Methods 0.000 description 1
- 231100000350 mutagenesis Toxicity 0.000 description 1
- 235000019645 odor Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000008542 thermal sensitivity Effects 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000009777 vacuum freeze-drying Methods 0.000 description 1
- 238000004457 water analysis Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/1826—Organic contamination in water
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a kind of assay method of total organic content in water, including：Water sample is handled using reverse osmosis technology, then water extracts are freeze-dried, high temperature sintering, the total organic content in water sample is determined.The present invention is freeze-dried high temperature sintering method using counter-infiltration and determines total organic content in water, can carry out accurate macroanalysis to the organic matter in water, solve in water total organic content can not directly, carry out quantitative problem exactly.The high and low poison of this method degree of accuracy is pollution-free, efficiency high, time-consuming few, can be to total organic matter pollution situation accurate quantitative analysis in water, be conducive to lifting water supply safety and drinking water safety supportability, to ensure people's quality of drinking water safety, offer safety guarantee of building a harmonious society.
Description
Technical field
The present invention relates to a kind of assay method of total organic content in water, and in particular to one kind uses counter-infiltration-freezing
The method of total organic content in drying-high temperature sintering method Accurate Determining water.
Background technology
Drinking water quality is national public safety system important component safely, with people's health and social stability
It is closely bound up.Organic Pollution in water is primarily referred to as humic acid, polycarboxylate compound, animal and plant fiber, grease, carbohydrate, life
Organic matter of living and industrial water discharge etc..Water quality deterioration can be made after these Organic Pollution water bodys, they carry out biological oxidation
Need to consume the oxygen in water during decomposition, while can also ferment, to making bacterial growth, in addition many organic matters belong to " teratogenesis ",
The three of " mutagenesis " and " carcinogenic " cause material, can produce heavy damage to water source.Therefore people are frequently with various technologies and means
Water quality is evaluated, to successfully manage Human Health Risk caused by water pollution.
Evaluation to total organic matter in water, in water analysis it is general using total organic carbon (TOC), COD (COD),
The indexs such as biochemical oxygen demand (BOD) (BOD) are measured.But these evaluation indexes are only indirectly to reflect water quality by organic matter
The degree of pollution, total organic content that can not be in Accurate Determining water.Chromatogram, mass spectrum class large-scale instrument determine organic in water
Thing is only the content for determining a kind of, several or a certain type organic, and it is accurate that the total organic content in water can not be carried out
Determine.Though macroreticular resin separating and purifying technology can be enriched with to Organic substance in water, it is longer that it isolates and purifies the time, pollution
It is heavier, and different types of resin can only be directed to the organic matter of certain characteristic, and all types organic matter in water can not be entered
Row purifying.In water activated carbon chloroform extract thing (CCE) method determine water in total organic content (the flat water sources foreign odors of Xie Zhi and
To Anhui branch of water deodoring [M] Chinese urban water supply associations, 1989.), used by countries in the world when carrying out water-quality determination, be
Refer to water by activated carbon filtering layer, adsorbed with activated carbon after underwater micro- organic matter, solvent is done with chloroform, using soxhlet extraction
Mode extracts organic matter in solvent out, these extracts is surveyed by the organic matter dissolution being tightly held by activated carbon, then by evaporation
Fixed and analysis.But the active carbon adsorption technology used in this method can not adsorb whole organic matters in water, and be only applicable to containing molten
Solve the measure of form organic matter；Belong to three cause reagents as the chloroform of solvent, toxicity is larger, there is potential danger to health
Evil；Surname extraction required time is longer, and the organic matter of absorption on the activated carbon can not all be parsed by chloroform, less efficient；
During chloroform evaporated, the organic matter of a large amount of volatilizations and half volatile can also be volatilized, and larger error is caused to measurement.Therefore, more than
The total organic content that methods described is determined in water certainly will make result produce relatively large deviation.Inventor's total organic matter in water-filling is entered
Found in the experiment of measure, the method that TOC, COD, BOD, large-scale instrument, CCE etc. determine total organic matter in water is numerous in the presence of operating
Trivial, data are inaccurate, heavy contamination, it is less efficient the shortcomings of.In summary reason, invents a kind of simplicity, time-saving and efficiency, without dirt
The high method for determining total organic content in water of dye, the degree of accuracy is imperative.
The content of the invention
There is provided a kind of new Accurate Determining for the deficiency of the invention for being directed to total organic content assay method in above-mentioned water
The method of total organic content in water, i.e. counter-infiltration-freeze-drying-high temperature sintering method.This method is anti-by being carried out to water sample
After infiltration processing, then vacuum freeze drying, high temperature sintering are carried out, so as to total in more accurate, easy, efficient measure water
Content of organics.
Its concrete technical scheme is as follows：
The assay method of total organic content, is handled water sample using reverse osmosis technology in a kind of water, then to dense
Shrink sample is freeze-dried, high temperature sintering, determines the total organic content in water sample；Comprise the following steps that：
(1) reverse-osmosis treated：Water sample is subjected to reverse-osmosis treated by reverse osmosis membrane, reverse osmosis concentrated water is collected, calculates water
The enrichment times of sample counter-infiltration；
(2) it is freeze-dried：By the concentrated water after counter-infiltration it is well mixed after, sampling 100mL is in porcelain crucible and is put into refrigerator
It is middle to be freezed；Then it is freeze-dried using vacuum freeze drier, then takes out and be placed in drier, it is to be restored
To room temperature, the quality of weigh with scale sample and container obtains quality m1；
(3) high temperature sintering：The freeze-drying residue for taking above-mentioned steps (2) to obtain is put into calcination in Muffle furnace, after calcination
Taking-up is placed in drier and is cooled to after room temperature, the quality of weigh with scale sample and container, obtains quality m2；
(4) difference of the quality drawn by above-mentioned steps (2) and (3)：m1-m2, as step (2) taken in concentrated water water sample
Organic matter quality, according to the cycles of concentration of counter-infiltration by calculating the content of total organic matter in step (1) institute water sampling,
Calculation formula is：
In formula：The concentration of ρ-Organic substance in water, mg/L；
m1The quality of sample and container, g after-freeze-drying；
m2The quality of sample and container, g after-high temperature sintering；
1000-g and mg conversion multiple；
10-100mL and 1L conversion multiple；
The enrichment times of N-water sample counter-infiltration.
In the above method, the reverse-osmosis treated flow described in step (1) is：At reverse osmosis membrane cleaning-water sample counter-infiltration
Reason-reverse osmosis concentrated Water Sproading, is comprised the following steps that：
1. reverse osmosis membrane is cleaned：High purity water is squeezed into water tank, reverse-osmosis circulating pump is opened and is rinsed, after the completion of circulation,
By the concentrated water emptying containing protection liquid and impurity；Above procedure is repeated, protection liquid and other impurities cleaning into reverse osmosis membrane
Totally；
The consumption of the high purity water is 15-20L, electrical conductivity<1us/cm；Flow velocity during flushing is 6-15LPM, every time cleaning
Time be 10min, repeated washing 3-4 times.
2. water sample reverse-osmosis treated：Water sample is squeezed into water tank, reverse-osmosis circulating pump is opened, to water sample enrichment method；
3. reverse osmosis concentrated Water Sproading：The concentrated water of enrichment method is reclaimed completely and quantified with graduated cylinder, water sample enrichment times is calculated
Number.
In the above method, the reverse osmosis membrane described in step (1) is for running water or reaches national surface water environment mark
The ultralow pressure aromatic polyamide composite membrane of accurate raw water desalination.
In the above method, the amount of water sample described in step (1) is 100L, and the flow velocity of water sample is 8L/ during reverse-osmosis treated
Min, obtains the concentrated water 3-4L after counter-infiltration.
In the above method, the temperature of refrigerator freezing described in step (2) is -18 DEG C, and cooling time is 12-16h.
In the above method, the temperature of vacuum freeze drier is less than -40 DEG C in step (2), and vacuum is 10-40Pa,
Sublimation drying is 36-40h.
In the above method, the temperature of calcination is 450 DEG C in step (3) described Muffle furnace, and the time is 2h.
In the above method, the balance described in step (2) or (3) is a ten thousandth electronic balance.
Counter-infiltration-freeze-drying-high temperature sintering method that the present invention is used can accurately determine total organic matter in water and contain
The reason for amount is：Reverse-osmosis treated is carried out to water sample, the efficiency that reverse osmosis membrane not only retains Organic substance in water is higher, and to water
Sample is measured again after being concentrated makes measurement result deviation smaller；Water sample is made in (- 40 DEG C of low temperature using vacuum freeze drier
Below), it is dehydrated, is particularly suitable for use in thermal sensitivity, effumability, easy oxygen after being freeze-dried under the conditions of vacuum (10-40Pa)
Change the drying of the organic matter decomposed, organic matter present in water is remained to greatest extent, and drying efficiency is higher, can exclude
More than 95%-99% moisture；Sample after freeze-drying 450 DEG C of high temperature sintering 2h in Muffle furnace, are removed to greatest extent
Organic matter present in sample, so as to improve the accuracy for determining total organic content in water, solves conventional method not
The problem of total organic content in energy accurate evaluation water.Reverse osmosis concentration is first carried out to water sample, then water sample after concentration is carried out cold
Dry, high temperature sintering is freezed, can more accurate, easy, the efficient total organic content determined in water.This method degree of accuracy
High and low poison is pollution-free, efficiency high, time-consuming few, lifting can be conducive to feed water total organic matter pollution situation accurate quantitative analysis in water
Safety and drinking water safety supportability.
Embodiment
Below by specific embodiment, the present invention will be further elaborated, and the description below is merely to explain this hair
It is bright, its content is not defined.
Embodiment 1
By taking certain reservoir source water as an example, the method for relatively more traditional CCE methods and the present invention determine the situation of its total organic matter：
(1) total organic matter in source water is determined using the method for the present invention：Reverse osmosis membrane is carried out instead with high purity water first
Multiple circulation flushing, after rinsing well, takes source water 100L, carries out reverse-osmosis treated with reverse osmosis membrane with 8L/min speed, obtain
To reverse osmosis concentrated water 3.3L；The enrichment concentrated water 100mL after infiltration is negated, is put into -18 DEG C of deep freezers to freeze and is taken out after 14h,
It is put into vacuum freeze drier and is freeze-dried 38h, to be restored to being weighed after room temperature in drier, quality is put into after taking-up
For 140.1240g (m1)；Sample after weighing is put into Muffle furnace, takes out and is put into drier after 450 DEG C of calcination 2h, treat cold
But to being weighed after room temperature, quality is 139.8664g (m2).The quality of the taken dense Organic substance in water of 100mL is m1-m2=
140.1240g-139.8664g=0.2576g, it is 85.02mg/L according to the content that formula scales are water source Organic substance in water.
(2) traditional CCE methods are used to determine the content of total organic matter in same source water for 0.27mg/L.However,
The TOC in the total organic carbon analyzer practical measurement source water is used for 2.1mg/L, be far longer than that CCE methods measure always has
The content of machine thing.It can be seen that, traditional CCE methods have that charcoal absorption is incomplete, cable-styled carry in total organic matter in determining water
The shortcomings of losing larger when taking inefficient, chloroform to evaporate.
As can be seen here, it is more accurate, reliable through the total organic content in the source water of the invention determined.
Embodiment 2
This specific embodiment uses following steps：
(1) certain pipe network water 100L is taken, reverse-osmosis treated is carried out using reverse osmosis membrane with 8L/min speed, counter-infiltration is obtained
Concentrated water 3.3L；
(2) the enrichment concentrated water 100mL after infiltration is negated, is put into -18 DEG C of deep freezers to freeze and is taken out after 14h, is put into true
Be freeze-dried in vacuum freecing-dry machine after 38h, taking-up be put into it is to be restored to being weighed after room temperature in drier；
(3) sample after weighing is put into Muffle furnace, takes out and be put into drier after 450 DEG C of calcination 2h, is cooled to
Weighed after room temperature；
(4) pipe network water set 5 it is parallel, it is respectively 10.6mg/L, 10.1 mg/L, 9.8mg/ to measure its total organic content
L, 10.4mg/L, 10.2mg/L, total organic matter average content are 10.2mg/L, and relative standard deviation is 3.0%.
As can be seen here, the total organic content stability that method of the invention is determined in pipe network water is preferable.
Embodiment 3
This specific embodiment uses following steps：
(1) certain source water 100L is taken, reverse-osmosis treated is carried out using reverse osmosis membrane with 8L/min speed, counter-infiltration is obtained
Concentrated water 3.3L；
(2) the enrichment concentrated water 100mL after infiltration is negated, is put into -18 DEG C of deep freezers to freeze and is taken out after 14h, is put into cold
Be freeze-dried in lyophilizer after 38h, taking-up be put into it is to be restored to being weighed after room temperature in drier；
(3) sample after weighing is put into Muffle furnace, takes out and be put into drier after 450 DEG C of calcination 2h, is cooled to
Weighed after room temperature；
(4) source water set 5 it is parallel, it is respectively 90.5mg/L, 86.7 mg/L, 88.9mg/ to measure its total organic content
L, 85.4mg/L, 87.8mg/L, total organic matter average content are 87.9mg/L, and relative standard deviation is 2.2%.
Embodiment 4
This specific embodiment uses following steps：
(1) certain surface water, each 100L of certain pipe network water are taken, is carried out with 8L/min speed using reverse osmosis membrane at counter-infiltration
Reason, obtains reverse osmosis concentrated water 3.3L；
(2) the enrichment concentrated water 100mL after infiltration is negated, is put into -18 DEG C of deep freezers to freeze and is taken out after 14h, is put into cold
Be freeze-dried in lyophilizer after 38h, taking-up be put into it is to be restored to being weighed after room temperature in drier；
(3) sample after weighing is put into Muffle furnace, takes out and be put into drier after 450 DEG C of calcination 2h, is cooled to
Weighed after room temperature；
(4) it is that the total organic content in 84.2mg/L, this pipe network water is to measure the total organic content in this surface water
9.4mg/L。
Claims (9)
1. the assay method of total organic content in a kind of water, it is characterised in that handled using reverse osmosis technology water sample,
Then water extracts are freeze-dried, high temperature sintering, determine water sample in total organic content；Comprise the following steps that：
(1) reverse-osmosis treated：Water sample is subjected to reverse-osmosis treated by reverse osmosis membrane, reverse osmosis concentrated water is collected, calculates water sample anti-
The enrichment times of infiltration；
(2) it is freeze-dried：After concentrated water after counter-infiltration is well mixed, 100mL is in porcelain crucible and is put into refrigerator for sampling
Row freezing；Then it is freeze-dried using vacuum freeze drier, then takes out and be placed in drier, it is to be restored to room
Wen Hou, the quality of weigh with scale sample and container, obtains quality m1；
(3) high temperature sintering：The freeze-drying residue for taking above-mentioned steps (2) to obtain is put into calcination in Muffle furnace, is taken out after calcination
It is placed in drier and is cooled to after room temperature, the quality of weigh with scale sample and container obtains quality m2；
(4) difference of the quality drawn by above-mentioned steps (2) and (3)：m1-m2, as step (2) takes organic in concentrated water water sample
Amount of substance, according to the cycles of concentration of counter-infiltration by calculating the content of total organic matter in step (1) institute water sampling, calculates public
Formula is：
<mrow>
<mi>&rho;</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mo>(</mo>
<msub>
<mi>m</mi>
<mn>1</mn>
</msub>
<mo>-</mo>
<msub>
<mi>m</mi>
<mn>2</mn>
</msub>
<mo>)</mo>
<mo>&times;</mo>
<mn>1000</mn>
<mo>&times;</mo>
<mn>10</mn>
</mrow>
<mi>N</mi>
</mfrac>
</mrow>
In formula：The concentration of ρ-Organic substance in water, mg/L；
m1The quality of sample and container, g after-freeze-drying；
m2The quality of sample and container, g after-high temperature sintering；
1000-g and mg conversion multiple；
10-100mL and 1L conversion multiple；
The enrichment times of N-water sample counter-infiltration.
2. the assay method of total organic content in water according to claim 1, it is characterised in that described in step (1)
Reverse-osmosis treated flow is：Reverse osmosis membrane cleaning-water sample reverse-osmosis treated-reverse osmosis concentrated Water Sproading, is comprised the following steps that：
1. reverse osmosis membrane is cleaned：High purity water is squeezed into water tank, reverse-osmosis circulating pump is opened and is rinsed, after the completion of circulation, will contain
There is the concentrated water emptying of protection liquid and impurity；Above procedure is repeated, protection liquid and other impurities into reverse osmosis membrane are cleaned up；
2. water sample reverse-osmosis treated：Water sample is squeezed into water tank, reverse-osmosis circulating pump is opened, to water sample enrichment method；
3. reverse osmosis concentrated Water Sproading：The concentrated water of enrichment method is reclaimed completely and quantified with graduated cylinder, water sample enrichment times are calculated.
3. the assay method of total organic content in water according to claim 2, it is characterised in that step 1. described in it is high
The consumption of pure water is 15-20L, electrical conductivity<1us/cm；Flow velocity during flushing is 6-15LPM, and the time cleaned every time is 10min,
Repeated washing 3-4 times.
4. the assay method of total organic content in water according to claim 1 or 2, it is characterised in that described reverse osmosis
Permeable membrane is the ultralow pressure aromatic polyamide composite membrane for running water or the raw water desalination for reaching national surface water environment standard.
5. the assay method of total organic content in water according to claim 1, it is characterised in that described in step (1)
The amount of water sample is 100L, and the flow velocity of water sample is 8L/min during reverse-osmosis treated, obtains the concentrated water 3-4L after counter-infiltration.
6. the assay method of total organic content in water according to claim 1, it is characterised in that described in step (2)
The temperature of refrigerator freezing is -18 DEG C, and cooling time is 12-16h.
7. the assay method of total organic content in water according to claim 1, it is characterised in that vacuum in step (2)
The temperature of freeze drier is less than -40 DEG C, and vacuum is 10-40Pa, and sublimation drying is 36-40h.
8. the assay method of total organic content in water according to claim 1, it is characterised in that step (3) described horse
Not the temperature of calcination is 450 DEG C in stove, and the time is 2h.
9. the assay method of total organic content in water according to claim 1, it is characterised in that in step (2) or (3)
Described balance is a ten thousandth electronic balance.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110927003A (en) * | 2019-11-14 | 2020-03-27 | 徐州伟天化工有限公司 | Method for detecting total sulfur in water |
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|---|---|---|---|---|
| US5425919A (en) * | 1992-03-26 | 1995-06-20 | Shimadzu Corporation | Total organic carbon analyzer |
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