吕梁市降雪中重金属污染分析

Analysis of Heavy Metal Pollution in Snowfall Samples in Lvliang City

通过对吕梁市2017年12月至2018年1月两场降雪样品的采集,用电感耦合等离子体原子发射光谱法测定了样品中Cu、Pb、Zn、Cd、Cr、Mn等6种重金属的含量,研究了吕梁市降雪中重金属的含量特征,利用富集系数法分析了其来源,并对其潜在生态风险进行了评价。结果表明:降雪中重金属含量顺序为Zn> Mn> Pb> Cu> Cr> Cd,融雪可排入自然水体。富集系数分析表明,降雪中Cr的来源主要来自地壳,Mn受到人为活动的影响,属于中度富集,Cu、Zn、Cd、Pb属于严重富集。潜在生态风险评价显示,降雪中重金属的潜在生态风险为中等生态风险水平,其中Cd的生态危害指数最高。

Two snowfall samples were collected from December 2017 to January- 2018 in lvliang City-, and the concentrations of six heavy metals （Cu, Pb, Zn, Cd, Cr , Mn） in the samples were monitored by inductively coupled plasma atomic emission spectrometry. The characteristics of heavy metal content of snowfall sample in lvliang City- were described. The source was analyzed by enrichment factor method and its potential ecological risk was evaluated. The results showed that the order of heavy metals in snowfall is Zn 〉 Mn 〉 Pb 〉 Cu 〉 Cr 〉 Cd, melting snow can be discharged into natural water. Analysis of enrichment factor showed the source of Cr was mainly from the earth crust, Mn was affected by human activities and belonged to moderate enrichment,Cu、 Zn、 Cd、Pb were heavily enriched. Potential ecological risk assessment showed that the potential ecological risk of heavy metals in snowfall was moderate ecological risk level, Cd had the highest ecological hazard index.