微波消解-电感耦合等离子体质谱法同时测定土壤中4种重金属元素

发布时间：2018-06-13 11:13

本文选题：土壤 + 微波消解　；参考：《热带作物学报》2017年11期

【摘要】：采用硝酸-盐酸-氢氟酸作消解体系,以微波消解的方法处理土壤样品,利用ICP-MS同时测定土壤样品中的4种重金属元素(铅、铜、铬、镉)。设定了最佳的样品前处理条件和仪器测定条件,在进行质谱测定时,采用In、Bi、Ge元素作为校正基体效应与信号漂移的内标元素。依据国家标准参考物质并通过加标回收试验,对方法进行了验证。结果表明:该方法所得重金属元素铅、铜、铬、镉的检出限分别为0.010、0.020、0.050、0.005μg/L,加标回收率分别为98%~106%、97%~112%、94%~118%和98%~104%;测定不同土壤标准物质,铅、铜、铬、镉测定结果均在标准值允差范围内,相对标准偏差(RSD)介于0.5%~2.5%。说明该方法稳定性好、精密度高、操作简便、成本低,适用于大量土壤样品4种重金属元素(铅、铜、铬、镉)的同时测定。
[Abstract]:Soil samples were treated by microwave digestion with nitric acid hydrochloric acid hydrofluoric acid as digestion system. ICP-MS was used to simultaneously determine four heavy metals (lead copper chromium cadmium) in soil samples. The optimum sample pretreatment conditions and instrumental determination conditions were set up. In the mass spectrometric analysis, the element Inanbigo GE was used as the internal standard element for correcting the matrix effect and the signal drift. According to the national standard reference material and through the standard recovery test, the method was verified. The results showed that the detection limits of heavy metal elements lead, copper, chromium and cadmium were 0.010 ~ 0.020 ~ 0.050 ~ 0.005 渭 g / L, respectively, and the recoveries of standard addition were 98 ~ 106 ~ 97 ~ 97 ~ 112 ~ 94% and 98 ~ 104% respectively. The results of determination of lead, copper, chromium and cadmium in different soils were within the range of allowable standard values. The relative standard deviation (RSD) is between 0.5 and 2.5. This method has the advantages of good stability, high precision, simple operation and low cost. It is suitable for simultaneous determination of four heavy metals (lead, copper, chromium and cadmium) in a large number of soil samples.
【作者单位】：国家普洱茶产品质量监督检验中心(普洱市质量技术监督综合检测中心);
【基金】：国家质量监督检验检疫总局科技计划项目(No.2015QK198) 云南省科技厅应用基础研究计划青年项目(No.2015FD100)
【分类号】：O657.63;X833

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