第三排水沟是宁夏境内银北区域最长的一条入黄排水沟,其水质直接影响黄河宁夏段的出境水质.为研究第三排水沟重金属污染特征,评价其的污染状况,本文通过在三排设置4个采样点测定水体重金属浓度和7个采样点的底泥重金属汞、砷、铬(六价铬)、铜、锌、镉、铅等指标.利用单因子污染指数法,内梅罗综合污染指数法等方法评价了污染状况.结果表明:三排水体中重金属属于清洁水平,底泥中汞、锌、镉、铅、砷均超过土壤背景值.水体和底泥重金属所受污染严重程度为惠农区段＞贺兰县段＞平罗县段.因此,应当控制附近工业园区的污染物排放量.
The third drain is the longest drainage canal flowing into the Yellow River in the Yinbei region of Ningxia,and its water quality directly affects the water quality of the Ningxia section of the Yellow River.In order to study the characteristics of heavy metal pollution in the third drain and evaluate its pollution status,this paper measures the heavy metal concentrations in the water at four sampling points and the heavy metals such as mercury,arsenic,chromium(hexavalent chromium),copper,zinc,cadmium,and lead in the sediment at seven sampling points in the third drain.The pollution status is evaluated using methods such as the single-factor pollution index method and the Nemerow comprehensive pollution index method.The results show that the heavy metals in the third drain's water belong to a clean level,while mercury,zinc,cadmium,lead,and arsenic in the sediment exceed the soil background values.The severity of heavy metal pollution in the water and sediment is:Huinong section＞Helan section>Pingluo section.Therefore,the pollutant emissions from nearby industrial parks should be controlled.
郑翔天;杨桂钦
宁夏大学生态环境学院 宁夏,银川 750021宁夏大学地理科学与规划学院 宁夏,银川 750021
环境科学
底泥;沉积物;重金属;污染评价;生态风险指数
sediment;sediment;heavy metals;pollution assessment;ecological risk index
《现代农业研究》 2024 (005)
20-26 / 7
国家自然科学基金项目"宁夏银北盐碱区排水沟岸边带土壤微生物驱动氮循环过程研究"(项目编号:42267011)
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