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Pesticides in three rural rivers in Guangzhou, China: spatiotemporal distribution and ecological risk

Frequent and widespread pesticide use is a major concern for both human and environmental health. The aim of this study was to screen for 19 pesticides in rural rivers in Guangzhou, China, evaluating the potential impact of detected pesticides on the local ecosystem. Sampling was performed in rural...

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Published in:Environmental science and pollution research international 2019-02, Vol.26 (4), p.3569-3577
Main Authors: Tang, Xiao-Yan, Yang, Yang, Tam, Nora Fung-Yee, Tao, Ran, Dai, Yu-Nv
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description Frequent and widespread pesticide use is a major concern for both human and environmental health. The aim of this study was to screen for 19 pesticides in rural rivers in Guangzhou, China, evaluating the potential impact of detected pesticides on the local ecosystem. Sampling was performed in rural rivers in three environment types: agricultural, industrial, and unpolluted, with sampling of water and sediments in both wet and dry seasons. A total of 11 pesticides were detected overall and their spatiotemporal distribution in water and ecological risk were assessed. Five pesticides were detected at concentrations above 100 ng L −1 , with the highest concentration pesticides being dimethoate (1318 ng L −1 ) in surface water and quinalphos (328 ng g −1 dry weight (dw)) in sediments. The most commonly detected pesticides were chlorpyrifos, acetochlor, and butachlor with detection frequencies of 50–57% and 29–43%, in water and sediments, respectively. Samples from the agricultural rural river contained the most pesticides and at higher concentrations, as compared to industrial and unpolluted areas, especially during the wet season. Ecotoxicological risk assessment through Risk Quotients (RQs) showed that chlorpyrifos and fenvalerate pose high ecological risks in water and therefore, reduction of the source input of these pesticides is essential.
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Samples from the agricultural rural river contained the most pesticides and at higher concentrations, as compared to industrial and unpolluted areas, especially during the wet season. Ecotoxicological risk assessment through Risk Quotients (RQs) showed that chlorpyrifos and fenvalerate pose high ecological risks in water and therefore, reduction of the source input of these pesticides is essential.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><pmid>30523525</pmid><doi>10.1007/s11356-018-3808-y</doi><tpages>9</tpages></addata></record>
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subjects Acetochlor
Agrochemicals
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
Butachlor
China
Chlorpyrifos
Dimethoate
Dry season
Earth and Environmental Science
Ecological risk assessment
ecosystems
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental science
Fenvalerate
humans
Pesticides
Public health
Quinalphos
Quotients
Rainy season
Research Article
risk
Risk assessment
Risk factors
Rivers
Sampling
Sediments
Spatial distribution
Surface water
Temporal distribution
Waste Water Technology
Water Management
Water Pollution Control
Weight
wet season
title Pesticides in three rural rivers in Guangzhou, China: spatiotemporal distribution and ecological risk
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