6种南方酸性土壤重金属元素氯化钙可提取态标准物质研制

土壤重金属元素可提取态可更好地反映土壤中重金属的环境效应和生态风险,在土壤污染调查和研究工作中受到广泛关注。实验以CaCl₂溶液作为提取剂,研制了6种南方酸性土壤重金属CaCl₂可提取态标准物质。样品分别采自江苏、安徽、福建和贵州,经干燥、研磨、过筛、混匀等步骤制备而成,检验评估结果表明样品均匀性和稳定性良好。由11家实验室采用多种不同原理分析方法协作定值,认定值为多家实验室测试结果的算术平均值,定值指标(参数)包括CaCl₂溶液提取的Cd、As、Pb、Cr、Cu、Ni、Zn、V、Mn、Co、Mo、Tl、Sb、Be元素可提取态及pH值。该系列标准物质适用于土壤可提取态分析中仪器校准、分析方法确认和评价、测量过程质量控制、技术能力考核及分析结果仲裁等技术工作。

Review on the application of X-ray fluorescence spectrometry in trace and ultra-light elements analysis

The analysis of trace elements and ultra-light elements was the weakest aspects in X-ray fluorescence spectrometry (XRF), but they were also the most active parts in the field of XRF research. In order to improve the excitation and detection performance of trace and ultra-light elements, the design and performance of the instrument had been improved. In order to reduce and deduct the background, a lot of research had been carried out on the calculation of limit of detection and the reduction of sample particle size. In the paper, 223 papers on the analysis of trace elements and 43 papers on ultra light element analysis were collected. The research and application of technical methods, trace multi-element analysis, trace rare earth element analysis, energy dispersive X-ray fluorescence spectrometry in trace element analysis and ultra-light element analysis were reviewed. The development of trace and ultra-light element analysis methods had laid a foundation for multi-element analysis of ore, sample analysis of marine geology and mineral resources survey, large-scale geochemical survey and global geochemical mapping sample analysis. There were 266 citations in the paper.