Inorganic phosphorus fractions and sorption capacity of sediments correlated with physicochemical parameters of water in Langat River, Selangor Malaysia

Jega, Bilyaminu Garba and Muskhazli Mustafa, . and Rajaram, Micheal Charles and Nor Azwady Abd Aziz, . and Wan Mohd Syazwan Wan Solahudin, . and Noor Haza Fazlin Hashim, . and Bashirah Mohd Fazli, . (2025) Inorganic phosphorus fractions and sorption capacity of sediments correlated with physicochemical parameters of water in Langat River, Selangor Malaysia. Pertanika Journal of Science & Technology (Malaysia), 33 (1). 355 -377. ISSN 2231-8526

This study investigates the physicochemical parameters of water, their association with inorganic phosphate fractions, and the sorption capacity of sediments. Water and sediment samples were collected from upstream, midstream, and downstream sections between November 2022 and June 2023. The water samples were analysed according to the American Public Health Association (APHA) guidelines for physicochemical parameters. Inorganic phosphate fractions in the sediments were quantified using the molybdenum blue colourimetric method. Sediment phosphate sorption capacity was assessed by measuring the resulting filtrate and applying regression correlation and Langmuir isotherm models to determine the relationships among the sediment samples. Sediment analysis of inorganic phosphorous fractions revealed varying percentages of Ca-P (32.6%), Rs-P (38.3%), and Fe-P (48.4%) dominating the upstream, midstream, and downstream sections, respectively. Sediment phosphate adsorption varied between sections (upstream: 4.00 to 18.21 mg/g vs. midstream: 4.36 to 21.10 mg/g vs downstream: 4.00 to 12.98 mg/g), with no significant differences between streams at specific phosphate concentrations. However, all the sections displayed a saturation point of approximately 20–25 mg/l. The Langmuir isotherm parameters accurately described P adsorption onto Langat River sediments, as indicated by the moderately high R² values for Qmax and RL. The downstream section of the Langat River had elevated levels of EC, COD and SRP parameters and Ex-P, Al-P, Fe-P, and Ca-P fractions, except for the Rs-P fraction that dominated the midstream section, indicating collective effects of anthropogenic activities. Therefore, strict regulations to improve wastewater treatment and promote sustainable wastewater management are essential for reducing inorganic phosphorus pollution in the Langat River and protecting water quality.

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Abstract

This study investigates the physicochemical parameters of water, their association with inorganic phosphate fractions, and the sorption capacity of sediments. Water and sediment samples were collected from upstream, midstream, and downstream sections between November 2022 and June 2023. The water samples were analysed according to the American Public Health Association (APHA) guidelines for physicochemical parameters. Inorganic phosphate fractions in the sediments were quantified using the molybdenum blue colourimetric method. Sediment phosphate sorption capacity was assessed by measuring the resulting filtrate and applying regression correlation and Langmuir isotherm models to determine the relationships among the sediment samples. Sediment analysis of inorganic phosphorous fractions revealed varying percentages of Ca-P (32.6%), Rs-P (38.3%), and Fe-P (48.4%) dominating the upstream, midstream, and downstream sections, respectively. Sediment phosphate adsorption varied between sections (upstream: 4.00 to 18.21 mg/g vs. midstream: 4.36 to 21.10 mg/g vs downstream: 4.00 to 12.98 mg/g), with no significant differences between streams at specific phosphate concentrations. However, all the sections displayed a saturation point of approximately 20–25 mg/l. The Langmuir isotherm parameters accurately described P adsorption onto Langat River sediments, as indicated by the moderately high R² values for Qmax and RL. The downstream section of the Langat River had elevated levels of EC, COD and SRP parameters and Ex-P, Al-P, Fe-P, and Ca-P fractions, except for the Rs-P fraction that dominated the midstream section, indicating collective effects of anthropogenic activities. Therefore, strict regulations to improve wastewater treatment and promote sustainable wastewater management are essential for reducing inorganic phosphorus pollution in the Langat River and protecting water quality.

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Item Type:	Article
AGROVOC Term:	inorganic phosphorus
AGROVOC Term:	oxic sediments
AGROVOC Term:	water quality
AGROVOC Term:	sorption
AGROVOC Term:	analysis
AGROVOC Term:	wastewater treatment
AGROVOC Term:	correlation
AGROVOC Term:	pollution
AGROVOC Term:	wastewater management
Geographical Term:	Malaysia
Uncontrolled Keywords:	Anthropogenic, adsorption, correlation, fractions, isotherm
Depositing User:	Ms. Azariah Hashim
Date Deposited:	17 Aug 2026 03:56
Last Modified:	17 Aug 2026 03:56
URI:	http://webagris.upm.edu.my/id/eprint/4355

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