宁夏第三排水沟底泥重金属分布特征及污染评价OA

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.