A new environmental certified reference material (CRM) has been developed by the National Institute for Environmental Studies (NIES) to support research and development studies on trace heavy metals in landfill cover soils. The method of analysis requires the use of a 1 mol per L HCl solution to extract the metals of interest, the procedure being based on an official test method (Notification Method No. 19) of the Ministry of the Environment, Japan. Certified values for element concentrations have been issued for Al, Cd, Cr, Co, Cu, Pb, Mn, Ni, V and Zn, while reference values have been assigned to As, Fe and Hg. The efficiency of extraction for elements of interest was investigated using standard solutions of HCl (0.01, 0.1, 0.5, and 1 mol L⁻¹) and ultrapure water (UPW) and wide variation in extraction efficiency was noted reflecting the importance of chemical speciation in the context of liberation of analytes from the host matrix. The extractability of Cd, Cu, Mn, and Pb was relatively high (over 50% relative to the total metal content) for acid strengths in the range 0.1 to 1.0 mol L⁻¹, in contrast to that of Hg where the extraction efficiency was less than 5% even in 0.5 mol L⁻¹. On the basis of submitted data, the CRM is considered appropriate for use in analytical quality control for element speciation and trace analysis as well as for evaluation of new or modified extraction procedures based on the official test method.

中文翻译：

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新型认证参比物质的开发和特性，该参比物质用于稀覆盖物土壤的稀盐酸萃取分析

美国国家环境研究所（NIES）已开发出一种新的环境认证参考材料（CRM），以支持对垃圾填埋场覆盖土壤中的痕量重金属进行研究和开发。分析方法需要使用每L HCl溶液1 mol提取目标金属，该程序基于日本环境省的官方测试方法（第19号通知方法）。已为Al，Cd，Cr，Co，Cu，Pb，Mn，Ni，V和Zn颁发了元素浓度​​的认证值，而已为As，Fe和Hg指定了参考值。使用HCl（0.01、0.1、0.5和1 mol L ^-1的标准溶液）研究了感兴趣元素的提取效率）和超纯水（UPW）以及提取效率的巨大差异，这反映了在从基质基质中释放出分析物的背景下化学形态形成的重要性。在0.1至1.0 mol L ^-1范围内的酸强度下，Cd，Cu，Mn和Pb的萃取率相对较高（相对于总金属含量超过50％），而Hg的萃取效率为即使在0.5mol L ^-1中也小于5％。根据提交的数据，CRM被认为适用于分析质量控制，以进行元素形态分析和痕量分析，以及基于官方测试方法评估新的或改进的提取程序。