摘要
为了掌握区域沉积物的环境风险水平,对环境风险管理提供技术依据,以津南区月牙河为研究对象,采集表层和下层沉积物样品共计22个,测定了有机质含量、总氮、总磷、砷、铜、镍、汞、铅、镉、铬、锌等指标含量,运用单因子污染指数法、内梅罗污染指数法、生态风险指数法和有机污染指数法分析了沉积物中营养盐及重金属的风险水平.结果表明:各指标含量的空间差异较明显.单因子评价结果显示表层样品:锌＞总磷＞总氮=铜=镍=铅=镉=铅＞砷;下层样品中,除总磷和锌指标达到轻度污染水平外,其余指标均为清洁.内梅罗综合评价结果显示,表层样品中各指标污染程度不同,总氮=总磷=铜=镍=镉=锌＞铬＞砷=铅.各指标的RI均属于低风险,但表层样品存在显著空间差异,而下层样品RI差异较小.有机污染指数均远低于评价标准0.5％,属于"清洁"水平.
Abstract
In order to master the environmental risk level of regional sediments and provide technical basis for environmental risk management,Yueya River in Jinnan District was taken as the research object.A total of 22 surface and under layer sediment samples were collected and their contents of organic matter,total nitrogen,total phosphorus,arsenic,copper,nickel,mercury,lead,cadmium,chromium,zinc and other indicators were determined.The single factor pollution index,Nemerow pollution index,ecological risk index and organic pollution index were used to analyze the risk levels of nutrients and heavy metals.The results showed that the spatial difference of each index was obvious.Single factor evaluation results showed that the surface samples were zinc>total phosphorus>total nitrogen = copper = nickel = lead = cadmium = lead>arsenic.In the lower samples,all the indexes were clean except that the total phosphorus and zinc reached the slightly polluted level.Nemerow's comprehensive evaluation results showed that the pollution levels of each index in the surface samples were different,total nitrogen = total phosphorus = copper = nickel = cadmium = zinc>chromium>arsenic = lead.The RI of each index belonged to low risk,but the surface sample had significant spatial difference,while the bottom sample had little difference.The organic pollution index was much lower than the evaluation standard 0.5％,belonging to the"clean"level.
NETL
NSTL
万方数据