伊通河城区段表层沉积物营养盐分布的研究

Study on the Distribution of Nutrients in Surface Sediments of Yitong River City Section

在目标河段进行表层沉积物样品的采集,对采集样品进行有机质(OM)、总氮(TN)、总磷(TP)质量分数的测定与分析。采用污染指数法、有机指数法对该河段表层沉积物中营养盐污染状况进行评价,探讨河流底质营养盐污染现状。结果表明:目标河段表层沉积物中OM、TN、TP的平均质量分数分别为0.10%、564 mg·kg-1、338 mg·kg-1,说明河流表层沉积物中OM、TP质量分数较低,TN质量分数较高;污染评价指数显示,表层沉积物中存在一定的氮、磷污染风险,有机污染较轻,但存在一定的有机氮污染风险。

The surface sediment samples were collected in the target reach, and the mass fraction of organic matter(OM), total nitrogen(TN) and total phosphorus(TP) were determined and analyzed. Pollution index method and organic index method were used to evaluate the status of nutrient pollution, and the status of nutrient pollution in river bottom was discussed. The results showed that the average mass fractions of OM, TN and TP in the target reach were 0.10%, 564 mg·kg-1 and 338 mg·kg-1, indicating that the mass fraction of OM and TP was lower, while the mass fraction of TN was higher. The pollution evaluation index showed that there was a certain risk of nitrogen and phosphorus pollution in the surface sediments of river, and the organic pollution was lighter, but there was a certain risk of organic nitrogen pollution.