摘要
对宝鸡千河河道11个监测点底泥的OM(总有机质)、TN(总氮)、TP(总磷)和重金属(Pb、Zn、Cu、Cr、Cd)含量进行了监测,评价了该河道底泥营养盐和重金属的潜在生态风险。结果表明:底泥中OM浓度为1.25~8.48g/kg,TN浓度为0.14~1.92g/kg,TP浓度为0.41~1.02g/kg;营养盐污染评价结果表明,该河段底泥有机指数总体上处于清洁水平,但部分监测点有机氮污染相对严重,应注意对外源氮的控制;重金属Pb浓度为15.1~49.1mg/kg,Zn浓度为51.1~171.9 mg/kg,Cr浓度为7.86~43.5 mg/kg,Cd浓度为0.09~0.88 mg/kg,Cu浓度为3.64~19.5mg/kg;底泥中Pb、Zn、Cd的平均含量高于陕西省土壤元素背景值;重金属污染评价结果表明,底泥潜在重金属生态风险指数(RI)平均值为146.1,存在轻微的潜在生态风险水平;底泥中Cd的潜在生态危害风险高,贡献最大。
In this study,the contents of TN,TP,OM and heavy metal（ Pb,Zn,Cu,Cr,Cd） in the sediment of 11 sampling sites in the Qianhe river of Baoji city were monitored. Based on these data,the nutrient level and ecological risk of sediments were also assessed. The results showed that the contents of OM,TN and TP in the sediment were 1. 25 - 8. 48 g/kg,0. 14 -1. 92 g/kg,and 0. 41 - 1. 02 g/kg,respectively. The evaluation of nutrient contamination indicated that the organic matter pollution level in the sediment was overall clean level,but organic nitrogen pollution were relatively serious in some spots,so we should pay attention to the control of exogenous nitrogen input. The content of heavy metals Pb,Zn,Cr,Cd and Cu were 15. 1 -49. 1 mg/kg,51. 1 - 171. 9 mg/k,7. 86 - 43. 5 mg/kg,0. 09 - 0. 88 mg/kg,and 3. 64 - 19. 5 mg/kg,respectively. The average contents of Pb,Zn and Cd in sediment were all higher than the background value of Shannxi Province. Evaluation result of heavy metal showed that the potential ecological risk assessment index（ RI） was 146. 1,indicating that the sediment has slight ecological risk. Cadmium has the highest coefficient of potential ecological risk.
作者
易文利
YI Wen-li(College of Geography ＆ Environment, Baoji University of Arts and Sciences, Baoji, Shaanxi 721013, China;Key Laboratory of Disaster Monitoring ＆ Mechanism Simulation of Shaanxi Province, Baoji University of Arts ＆ Sciences, Baoji, Shaanxi 721013, China)
出处
《四川环境》
2018年第2期151-155,共5页
Sichuan Environment
基金
陕西省科技厅计划项目(2015JQ4114)
陕西省教育厅自然科学项目(14JS008)
旱区作物逆境生物学国家重点实验室开放课题(CSBAA2015003)
宝鸡文理学院重点项目(ZK12053)
陕西省重点学科自然地理学联合资助
关键词
底泥
碳
氮
磷
重金属
污染评价
Sediment
organic carbon
nitrogen
phosphorus
heavy metal
pollution assessment
