Niemelä Matti, Perämäki Paavo, Piispanen Juha
Department of Chemistry, University of Oulu, P.O. Box 3000, 90014 University of Oulu, Finland.
Anal Bioanal Chem. 2003 Mar;375(5):673-8. doi: 10.1007/s00216-003-1776-6. Epub 2003 Feb 13.
Arsenic in moss samples was determined by electrothermal atomic absorption spectrometry (ETAAS) after microwave-assisted sample digestion. Two different sample masses (500 mg and 1000 mg) and three different microwave ovens were used in the digestion. There was a slight difference in the digestion efficiency, as determined by the residual carbon concentrations of 500 mg digested samples, between the microwave ovens. The arsenic results obtained for moss reference samples were, in most cases, satisfactory. However, phosphorus was found to have a reducing influence on the arsenic peak area in the ETAAS determination. According to the results, it was not possible to reduce the phosphorus interference by increasing the amount of Mg(NO(3))(2) in the Pd-Mg chemical modifier. The arsenic results obtained by ETAAS were compared to those obtained by inductively coupled plasma mass spectrometry (ICP-MS).
采用微波辅助消解后，用电热原子吸收光谱法（ETAAS）测定苔藓样品中的砷。消解过程中使用了两种不同的样品质量（500毫克和1000毫克）以及三台不同的微波炉。通过500毫克消解样品的残留碳浓度测定发现，不同微波炉之间的消解效率存在细微差异。大多数情况下，苔藓参考样品的砷测定结果令人满意。然而，发现在ETAAS测定中磷对砷峰面积有降低影响。根据结果，通过增加钯 - 镁化学改进剂中硝酸镁的量无法减少磷的干扰。将ETAAS获得的砷测定结果与电感耦合等离子体质谱法（ICP-MS）获得的结果进行了比较。
