Distribution of organophosphorus pesticides in the bed sediments of a backwater system located in an agricultural watershed: influence of seasonal intrusion of seawater

Archives of Environmental Contamination and Toxicology
V BabuS M Nair

Abstract

This article focuses on the temporal and spatial distribution of three organophosphorous pesticides-malathion, methyl parathion, and chlorpyrifos-in the sedimentary environment of a backwater ecosystem, Kuttanad backwaters, situated in Kerala, India. Based on salinity distribution, geographic characteristics, and human activities prevailing in the area, the study area was divided into three zones: zone 1 with riverine characteristics, zone 2 with freshwater characteristics during and after the monsoon season and estuarine characteristics during the premonsoon season, and zone 3 with estuarine characteristics. The organophosphorus pesticides in the study area showed the order of enrichment as chlorpyrifos >malathion >methyl parathion. While studying the variations in pesticide concentrations seasonally, higher concentrations were observed during the premonsoon monsoon season, with the concentrations being lower than the detectable level. Sediment characteristics, such as pH, texture, organic carbon, moisture content, etc., had reflective effect on the degradation rates of pesticides. The runoff water from the paddy fields made a larger contribution of pesticide pollution to the study area.

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Citations

Jul 23, 2014·Ecotoxicology and Environmental Safety·Prabhat Kumar SrivastavaSheo Mohan Prasad
Oct 1, 2016·Environmental Science and Pollution Research International·Lili PanLizhong Zhu
Nov 30, 2019·Frontiers in Bioengineering and Biotechnology·Meghna ThakurScott A Walper
May 21, 2021·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Enoc Lima do RêgoJurandir Rodrigues de Souza
Apr 13, 2012·Journal of Agricultural and Food Chemistry·Yuxin XuMingrong Qian
Jul 3, 2021·Environmental Science and Pollution Research International·Yan HeJian Xu

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