选择重庆市某畜牧园区生猪养殖场的排放污物经厌氧消化后的沼液为研究对象, 通过建立微波消解-电感耦合等离子体质谱(ICP-MS)分析方法, 实现了沼液中所含重金属元素的全面、 快速分析检测, 实验结果表明生猪养殖沼液中主要存在的重金属包括Zn, Cu, As, Pb, Cd, Cr, Hg, Ni 八种, 各重金属元素的定量标准曲线的线性关系良好, r=0.999 89～0.999 98, 检出限在0.79～25.0 ng·L-1, 加标回收率在96.5%～107.6%, 以该分析方法测定标准物质, 所测数据的RSD在1.06%～4.35%, 表明该方法具有良好的精密度和准确性, 能够应用于沼液中重金属的检测分析, 并为养殖场污物发酵后沼液的后续利用提供有益参考。

A new microwave digestion/inductively coupled plasma mass spectrometry (ICP-MS) for simultaneous determination of 8 heavy metals including Zn, Cu, As, Pb, Cd, Cr, Hg and Ni in wastes of scale hoggery from livestock parks in Chongqing and its biogas slurry after anaerobic digestion, with which an all round, fast analysis of multiple heavy metals in biogas slurry was realized. From the experiment, Zn, Cu, As, Pb, Cd, Cr, Hg, and Ni were the dominating heavy metals in biogas slurry. The linear correlation coefficients for the heavy metals were between 0.999 89 and 0.999 98, indicating a good linear correlation. The determination limits were between 0.79 and 25.0 ng·L-1, recovery adding standard between 96.5% and 107.6%, RSD between 1.06% and 4.35%. These parameters revealed that the method has good precision and accuracy, which could be applied to the heavy metals detection in biogas slurry, and provide reference for its post-use.