微敞开体系快速全消解ICP-MS法测定土壤中总砷
Determination of total arsenic in soils by semi-open full digestion coupled ICP-MS
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摘要: 利用本课题组研发的一种新型消化管,探索了一种土壤总砷测定的微敞开体系快速全消解前处理方法,并将该方法与传统前处理方法-王水水浴法(GB/T 22105.2-2008)进行对比.结果显示,8种国家土壤标准物质经过王水消解后提取的砷含量符合标准参考值范围,但仅为快速全消解法测定的总砷含量的31.2%-60.2%.快速全消解法测定的砷含量基本相当于王水消解后溶液的砷含量与残渣中砷含量的总和.该结果表明王水消解后仍然有大量砷残留在未完全消化的土壤残渣中,王水水浴法提取的砷并非土壤中的"总砷".通过美国土壤标准物质SRM 2710a验证,微敞开体系快速全消解法能满足土壤"总砷"日常检测需求,配合ICP-MS的使用可以实现土壤中"总砷"与其他元素一次消解同时检测.Abstract: Using a new type of digestive tube, this paper explored a novel semi-open full digestion (SOFD) pretreatment method coupled with ICP-S for soil total arsenic (As) determination, which compared with the traditional aqua regia bathing method (GB/T 22105.2-2008). The results showed that the As concentrations of the 8 Chinese national soil reference materials extracted by aqua regia bathing met the standard reference range, but only equaled 31.2%-60.2% of the total As content determined by the SOFD method. The As content determined by SOFD method is basically equivalent to the sum of the As content extracted by aqua regia and the content in the residue. The results indicate that there is still a large amount of arsenic remaining in the incompletely digested soil residue after the aqua regia bathing, and the arsenic extracted by the aqua regia bathing method is not "total arsenic" in soils. In addition, the digestion of soil reference material-SRM 2710a by SOFD method could meet the standard reference range of total As of this American NIST reference sample. Therefore, this SOFD pretreatment method coupled with ICP-MS can be applied for determination of the total arsenic and other metallic elements in soils simultaneously.
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Key words:
- semi-open /
- full digestion /
- ICP-MS /
- total arsenic /
- soil /
- multi-element determination
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