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All Journal LIMNOTEK - Perairan Darat Tropis di Indonesia LIMNOTEK
Budi Santoso, Arianto
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Engineering Environmental Science

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KARAKTERISTIK DANAU ASAL VULKANIK STUDI KASUS: DANAU TOLIRE, PULAU TERNATE Setiawan, Fajar; Wibowo, Hendro; Budi Santoso, Arianto; Nomosatryo, Sulung; Yuniarti, Ivana
LIMNOTEK - Perairan Darat Tropis di Indonesia Vol 21, No 2 (2014)
Publisher : Research Center for Limnology

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Abstract

Ternate merupakan sebuah pulau vulkanik di Maluku Utara, didalamnya terdapat gunung api aktif (G. Gamalama) berketinggian 1.715 m dpl. Di pulau ini terdapat tiga danau (Tolire Besar, Ngade dan Tolire Kecil) yang berdasarkan proses terbentuknya digolongkan sebagai danau vulkanik dengan type Maar. Pengukuran yang dilakukan di Danau Tolire Besar pada tahun 2011 menghasilkan informasi kondisi fisik danau dan daerah tangkapannya. Danau Tolire dikelilingi oleh tebing curam setinggi 60-80 m, tidak mempunyai outlet dan inlet hanya berupa alur air dari puncak Gunung. Luas DTA danau adalah 244,2 Ha dengan tanah ber-ordo Inceptisols dan Ultisols, dengan Iklim termasuk tipe iklim B (Basah). Kedalaman maksimum danau 43,1 m, diameter 600 m, luas badan air 26,5 Ha, kecerahan danau hanya 4 m, salinitas, DO serta profil pH dan ORP mempunyai pola yang hampir sama, yang mengindikasikan bahwa pada kedalaman antara 8 dan 9 m adalah lapisan chemocline atau oxycline. Lapisan permukaan cenderung bersifat oksidatif dan lapisan dasar reduktif. Tidak dijumpai adanya stratifikasi lapisan danau oleh perbedaan suhu, dengan suhu permukaan 30°C. Daya dukung danau terhadap biota ikan sangat rendah, karena faktor tingginya kandungan sulfida dan lingkungan yang terisolir.
Characteristics of Phosphate Sorption on Surface Sediments: A Study in Kendari Bay Aisyah, Siti; Rohaeti, Eti; Budi Santoso, Arianto; Rafi, Mohamad
LIMNOTEK Perairan Darat Tropis di Indonesia Vol. 30 No. 1 (2024)
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/limnotek.2024.2019

Abstract

Phosphate adsorption and desorption are significant processes that influence the presence of phosphate in aquatic ecosystems and regulate the concentration of phosphate at the water-sediment interface. This research aims to investigate the characteristics of phosphate adsorption and desorption in Kendari Bay sediments, study the relationship between adsorption capacity and sediment characteristics and its phosphorus fraction, and evaluate its potential contribution to the overlying water column. Physicochemical measurements of the water and sediments were performed in the sampling location and the laboratory. Two types of adsorption-desorption kinetics models and two types of isothermal adsorption models were used to estimate the adsorption rate and capacity of the surface sediments. Adsorption kinetics and desorption kinetics experiments produced pseudo-second-order kinetic model equations with regression coefficients (R2) of 0.865–0.936 and 0.886–0.947, respectively. The isothermal adsorption experiment follows the Langmuir equation model with R2 = 0.964. The maximum adsorption capacity (Qmax) value was 156.3–227.3 mg/kg, and the phosphate concentration value at zero equilibrium (EPC0) was 0.0026–0.0047 mgP/L. Notably, the EPC0 value was higher than the SRP concentration, indicating that the resuspension of phosphate ions from sediment into the water column could occur. Furthermore, there was a correlation between Qmax values with OP, Al-P, Fe-P, clay particles, and organic materials. Potential practical applications may include integrating sediment adsorption capacity data into ecosystem models to inform nutrient management strategies and promote sustainable coastal development in Kendari Bay and beyond.
Co-Authors Eti Rohaeti FAJAR SETIAWAN Hendro Wibowo M. Rafi Siti Aisyah Sulung Nomosatryo Yuniarti, Ivana