引江济淮工程菜子湖线有机磷农药分布特征及生态风险评价

Distribution characteristics and risk Assessment of organophosphorus pesticides in Caizihu Lake Line of the leading water project from Yangtze River to Huaihe River

选取引江济淮工程重要的输水线之一菜子湖线为研究区域,检测分析了12种有机磷农药(organophosphorus pesticides,OPPs)在沿线水和沉积物中的污染水平、分布特征及生态环境风险,以更好地评估引江济淮工程菜子湖线水域农药类环境激素的污染及生态风险情况。结果表明:水体中OPPs的总质量浓度为112.8~1781.4 ng/L,主要以溴硫磷、三硫磷和灭线磷为主;沉积物中OPPs的总浓度范围为290.33~13105.25 ng/g,主要以灭线磷、治螟磷和毒虫畏为主。相对于我国其他水域,引江济淮工程菜子湖线水和沉积物中OPPs的主要污染物类别差异较大。水体中OPPs生态风险评估结果表明,溴硫磷、三硫磷和毒虫畏在菜子湖线全域均表现出较高生态风险(RQ>1),C、D、H和K这4个站点OPPs风险较高(RQ>10000),敌敌畏和治螟磷在大部分水域表现出中等(0.1<RQ<1)或低生态风险(RQ<1)。本研究结果不仅为今后长期追踪评估引江济淮工程沿岸水环境生态质量提供必不可少的本底数据,也为评估菜子湖线水生态环境健康风险提供科学依据和应用价值。

The Caizihu Lake line, one of the important water delivery lines of the leading water project from Yangtze River to Huaihe River, was selected as the research object. The pollution level, distribution characteristics and ecological environment risk of 12 kinds of organophosphorus pesticides(organophosphorus pesticides, OPPs) in the water and sediments along the line were tested and analyzed. The results showed that the total concentration of OPPs ranged from 112.8 to 1 781.4 ng/L in the water, mainly in bromophos, carbophenothion, and ethoprophos;and ranged from 290.33 to 13 105.25 ng/g in the sediments, mainly in ethoprophos, sulfotep and chlorfenvinphos. Compared with those in water and sediments from other areas in China, the main types of OPPs pollutants in the Caizihu Lake line are quite different. The results of the ecological risk assessment of OPPs in the water showed that bromophos, carbophenothion, and chlorfenvinphos showed high ecological risks(RQ > 1) in the entire ofCaizihu Lake line, much higher RQ of OPPs risks appeared at C, D, H, and K these four sites(RQ > 10 000), and dichlorvos and sulfotep in most observed sites showed mediμm(0.1 < RQ < 1) or low ecological risk(RQ < 1). The results of this study will not only provide the necessary basic data for the long-term tracking and evaluation of the ecological quality of the water environment along the Yangtze River to the Huaihe River, but also provide a scientific basis for assessing the health risks.