Surface Water Organophosphorus Pesticides Concentration and Distribution in the Langat River, Selangor, Malaysia

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• 作者：Sze Yee Wee ; Tuan Fauzan Tuan Omar ; Ahmad Zaharin Aris ; Yunho Lee
• 关键词：Organophosphorus pesticides ; Contamination ; Surface water ; Solid ; phase extraction ; HPLC–DAD ; Langat River Basin
• 刊名：Water Quality, Exposure and Health
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：8
• 期：4
• 页码：497-511
• 全文大小：1,101 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Pollution, General
  Environmental Medicine/Environmental Psychology
  
• 出版者：Springer Netherlands
• ISSN：1876-1666
• 卷排序：8

文摘

Pesticide contamination in the environment is a contemporary global issue. As agricultural production through crop planting in Malaysia now supports both energy and food productions, the concentration and distribution of pesticides in surface water may have changed. Therefore, this study assesses the concentration and distribution of organophosphorus pesticides (quinalphos, diazinon and chlorpyrifos) contamination in the Langat River, Selangor. The Langat River Basin is one of the most populated river basins in Malaysia. As a result, it is surrounded by various environmental stresses of which agricultural activity is a dominant cause. An analytical method has been developed and optimised based on solid-phase extraction and high-performance liquid chromatography, coupled with a diode array detector (SPE–HPLC–DAD). This method allowed for the determination and quantification of selected organophosphorus pesticides. The optimised method displays a high mean recovery for both quinalphos and diazinon (100.21 and 100.15 %, respectively) but relatively low recovery for chlorpyrifos (32.40 %). The low recovery of chlorpyrifos is due to limitations in the determination of multi-residues in a single analytical run, optimisation of chromatographic conditions and the recovery of each compound. The method detection limit was found to be 0.003 μg/L for quinalphos and diazinon, and 0.006 μg/L for chlorpyrifos. Sample analyses revealed the occurrence of quinalphos, diazinon and chlorpyrifos in the Langat River with chlorpyrifos found to have the highest mean concentration of 0.0202 μg/L. The quinalphos and diazinon sample concentrations were 0.0178 μg/L and 0.0094 μg/L, respectively. The concentrations of organophosphorus pesticides in this monitoring study were found to be below the Maximum Contaminant Levels (MCLs) established under the European Union (Drinking Water) Regulation 2014. This study was the first to detect concentrations of quinalphos and diazinon in the Langat River, Selangor.