大坝鱼类和沉积物中残留有机氯农药污染物的分布

IF 3.1 Q2 ENVIRONMENTAL SCIENCES
N. Mensah, S. Antwi-Akomeah, E. Belford, G. Sebiawu, R. Aabeyir
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引用次数: 1

摘要

背景和目标:桑卡纳大坝易受有机氯农药污染是令人关切的一个主要原因。靛蓝依靠大坝提供饮用水和农田灌溉,以及鱼类和其他水生美食。尽管大坝易受农药污染,但实际上没有关于大坝中有机氯或其他农药污染物残留水平的研究。在本研究中,对桑卡纳大坝鱼类和沉积物中的有机氯残留水平进行了评估。方法:在醋酸钠、柠檬酸钠和硫酸镁存在下,用含1%(v/v)乙酸的乙腈提取农药残留,然后用活化的florisil和硫酸钠纯化。残留物提取物的鉴定和定量使用气相色谱结合质谱仪进行。结果:总共检测到13种不同水平的有机氯残留物,其中11种在鱼类中发现,12种在沉积物中发现。在鱼类中发现的有机氯残留物的平均水平在0.001-0.277 mg/kg之间。鱼类体内的β-六氯环己烷、δ-六氯环己烷和γ-六氯环己烷,硫丹-A和二氯二苯基二氯乙烷的残留量相对高于沉积物中的残留量。沉积物中发现的有机氯残留量也在0.001-0.091 mg/kg之间。沉积物中的二氯二苯二氯乙烯、艾氏剂、狄氏剂、异狄氏液、甲氧基氯、七氯、γ-氯丹和硫丹-B残留水平高于鱼类的相应水平。结论:该研究为连续/定期监测桑卡纳大坝和其他上游和下游水体中的有机氯污染物提供了基线。如果有机氯残留量超过其建议的允许阈值,通常表明集水区内可能最近/连续使用此类农药。因此,有必要采取适当措施和/或加强现有政策,通过严格执法禁止进口、销售和使用有机氯农药==========================================================================================版权所有©2021作者。这是一篇根据知识共享署名(CC BY 4.0)条款分发的开放获取文章,该条款允许在任何媒体上不受限制地使用、分发和复制,只要引用了原始作者和来源。不需要作者或出版商的许可==========================================================================================
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Residual organochlorine pesticide contaminants profile in fish and sediment from a dam
BACKGROUND AND OBJECTIVES: The vulnerability of the Sankana dam to organochlorine pesticide contamination is a major cause for concern. Indigenes rely on the dam for drinking water and irrigation of their farmlands as well as for fish and other aquatic delicacies. Virtually there exists no study on the residual levels of organochlorine or other pesticide contaminants in the dam despite its susceptibility to pesticide contamination. In the present study, the levels of organochlorine residues in fish and sediments from the Sankana dam were assessed. METHODS: Pesticide residue extraction was achieved using acetonitrile containing 1% (v/v) acetic acid in the presence of sodium acetate, sodium citrate and magnesium sulphate followed by purification over activated florisil and sodium sulphate. Identification and quantification of residue extracts was done using a gas chromatograph conjugated with mass spectrometer. FINDING: In all, varying levels of 13 organochlorine residues were detected, 11 of which were found in fish and 12 in sediment. Average mean levels of organochlorine residues found in fish ranged from 0.001 - 0.277 mg/kg. Residual levels of beta-hexachlorocyclohexane, delta-hexachlorocyclohexane, gamma-hexachlorocyclohexane, endosulfan-A and dichlorodiphenyldichloroethane in fish were relatively higher than their respective levels in sediment. Organochlorine residues found in sediment also ranged from 0.001 - 0.091 mg/kg. Dichlorodiphenyldichloroethylene, aldrin, dieldrin, endrin, methoxychlor, heptachlor, gamma-chlordane and endosulfan-B residual levels in sediment were higher than the corresponding levels in fish. CONCLUSION: The study provides a baseline for continuous/regular monitoring of organochlorine contaminants in the Sankana dam and other waterbodies upstream and downstream. Where organochlorine residues exceeded their recommended permissible thresholds typically suggests possible recent/continuous use of such pesticides within the catchment area. There is therefore the need for appropriate measures and/or need to strengthen existing policies that bans the importation, sale and use of organochlorine pesticides via strict enforcement.==========================================================================================COPYRIGHTS©2021 The author(s). This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, as long as the original authors and source are cited. No permission is required from the authors or the publishers.==========================================================================================
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CiteScore
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