电感耦合等离子体质谱(ICP-MS)法同时测定 荞麦秸秆中的重金属

基于硝酸-盐酸-氢氟酸消解体系，建立马弗炉-微波消解-电感耦合离子体质谱法同时测定荞麦秸秆中的Cr、Cu、Ag、Mn、Fe、As、Ni、Pb等重金属含量测定方法。在微波消解的过程中，分别考察五种不同组合的混合酸体系及两种消解方法对荞麦秸秆中八种重金属测试结果的影响。实验结果表明浓硝酸-浓盐酸-氢氟酸（6:2:2）混酸体系和马弗炉-微波消解样品前处理优于其他方法。在优化条件下八种重金属加标回收率为91.16~102.12%，相对标准偏差（RSD，n=5）为0.22% ~ 4.65%，检出限为0.18~9.41??g/L。该方法操作简便、快速、准确，结果可靠，同时测定荞麦秸秆中八种重金属。

Simultaneous determination of the heavy metal elements in Buckwheat straw by ICP-MS

Based on the nitric acid-hydrochloric acid-hydrofluoric acid digestion system, a muffle furnace-microwave digestion-inductively coupled plasma mass spectrometry method was established to simultaneously determine the content of heavy metals such as Cr, Cu, Ag, Mn, Fe, As, Ni, Pb in buckwheat straw. In the process of microwave digestion, the effects of five different combinations of mixed acid systems and three digestion methods were investigated. The experimental results show that concentrated nitric acid-concentrated hydrochloric acid-hydrofluoric acid (6:2:2) mixed acid system and muffle furnace-microwave digestion are better than other methods. Under the optimized conditions, the recovery rates of the eight heavy metals were 91.16~102.12%, the relativestandard deviation (RSD, n=5) was 0.22%~4.65%, and the detection limit was 0.18~9.41g/L. The method is simple, fast, accurate and reliable. It can simultaneously determine eight kinds of heavy metals in buckwheat straw.