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All Journal VALENSI GRADIEN Dharma Raflesia : Jurnal Ilmiah Pengembangan dan Penerapan IPTEKS Jurnal Pharmacopoeia Bencoolen Journal of Pharmacy Rafflesia Journal of Natural and Applied Sciences (RJNAS) Jurnal Sains & Kesehatan Darussalam
Dwita Oktiarni
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Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemistry Education Health Professions Immunology & microbiology Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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Assessment of Macronutrient Dynamics in a Tropical Watershed: A Study from Bengkulu River and Estuary Indonesia Wiwit, Wiwit; Ikhsani, Idha Yulia; Nurhamidah, Nurhamidah; Oktiarni, Dwita; Wong, Kuo Hong
Jurnal Kimia Valensi Vol. 11 No. 1 (2025): Jurnal Kimia VALENSI
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v11i1.42477

Abstract

This study assesses the sources, transport, and distribution of macronutrients, including nitrate, nitrite, silicate, and phosphate, starting from the upper stream of the Bengkulu River, which is the biggest river in Bengkulu Province, to the coastal seawater of the eastern tropical Indian Ocean. The sampling was conducted using an acid-washed polypropylene beaker and placed in acid-cleaned 5 L polyethylene containers during the dry season in July 2024. The water samples were collected from the surface waters of 15 stations. The macronutrients in the water samples were determined using a spectrophotometer UV-Vis following the Strickland and Parsons method. Macronutrient analysis was conducted in LATERIO BRIN, Jakarta, Indonesia. The concentration of analysed macronutrients ranged from 0.005 - 0.058 mgN-NO3/L for nitrate, <0.001 - 0.014 mgN-NO2/L for nitrite, 0.163 - 9.314 mgSi-Si(OH)4/L for silicate, and 0.01 - 0.085 mgP-PO4-/L for phosphate. Several stations, including Stations 6, 10, and 14, exhibited relatively elevated nitrate concentrations, which were further supported by similarly high phosphate levels. Stations 6, 10, and 14, situated near areas of intense anthropogenic activity in Bengkulu City, suggest that human-induced inputs have enriched the water environment with macronutrients. The highest silicate concentration was observed at Station 1, located upstream in the Bengkulu River. This aligns with previous findings and underscores the role of weathering processes in controlling silicate distribution. Compared to the macronutrient concentration guidelines for river water set by Indonesian Government Regulation 2021 No. 22, the nitrite concentrations at certain river stations exceeded the safety threshold for aquatic biota. In contrast, nitrate and phosphate levels remained within the safe range.
Co-Authors A.A. Ketut Agung Cahyawan W Agus Martono Agus Martono Hadi Putranto Avidlyandi, Avidlyandi Deni Agus Triawan Dominica, Dwi Dyah Fitriani Eka Angasa Firza, Bunga Al Gaol, Amelia Debora Lumban Harianti Putri, Yona Idha Yulia Ikhsani, Idha Yulia Irfan Gustian Lusiana Lusiana Morina Adfa Nabila Zhavira Nesbah Nesbah Nesbah, Nesbah Nurhamidah Nurhamidah Oktoviani Oktoviani Putri, Yona Harianti Rahmawati, Reza Sal Prima Yudha S Suripno Suripno Syalfinaf Manaf Virania, Geatika Wiwit, Wiwit Wong, Kuo Hong Yona Harianti Putri