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STUDIES ON BEHAVIOR OF HIGH-TECHNOLOGY RELATED ELEMENT GALLIUM IN SIOL ENVIRONMENT

高科技相关元素镓在SIOL环境中的行为研究

基本信息

批准号：
05680448
负责人：
OKAMOTO Kensaku
金额：
$ 1.09万
依托单位：
THE UNIVERSITY OF TOKUSHIMA
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05680448/
关键词：
Gallium Graphite Furnace Atomic Absrption Spectrometry Matrix Modifier Rock Reference Material Inductively Coupled Plasma Mass Spectrometry Isotope Ratio Measurement マトリックスモディファイアー

项目摘要

In order to establish an analytical method for trance determination of gallium in soil samples, graphite furnace atomic absorption spectrometry (GFAAS) using a Ta-coated graphite tube was examined. Matrix elements in soil such as Al, Ca, Fe, K,Mg, Na each showed signal enhancement of Ga in the concentration range from 100 to 1,000 ppm. A mixture of Al (500ppm), Ni (500ppm) and IM nitric acid was used as a most suitable matrix-modifier in this experiment. Gallium in rock reference materials (JA-1, JB-3, JLk-1) issued by Geological Survey of Japan was determined by Ta-coated GFAAS using the matrix-modifier. The analytical values obtained were in good agreement with the recommended values when standard additions method was employed. Gallium contents in soils determined by the above-mentioned method ranged from 20 to 50 ppm, consistent with reported values on Japanese soils.Inductively coupled plasma mass spectrometry (ICP-MS) was applied for the determination of Ga in soil digests. For the analysis of water samples, a linear calibration curve was obtained in the concentration range of ppt. However, there exists a severe mass overlapping interference due to C10 molecular ion in the case of Ga determination. An extraction of Ga from the soil matrix with 5-octyloxymethyl-8-quinolinol in chloroform followed by back-extraction with nitric acid was performed. In order to compensate for extraction efficiency, the use of isotope dilution mass spectrometry was recommended to obtain an accurate result on Ga in soil samples.

为了建立一种测定土壤样品中镓的恍惚分析方法，采用涂有ta的石墨管石墨炉原子吸收光谱法（GFAAS）进行了研究。土壤基质元素Al、Ca、Fe、K、Mg、Na在100 ~ 1000ppm浓度范围内均表现出Ga的信号增强。本实验选用Al （500ppm）、Ni （500ppm）和IM硝酸的混合物作为最合适的基质改性剂。采用基体改性剂，用ta包覆GFAAS法测定了日本地质调查局发布的岩石标准物质（JA-1、JB-3、jjk -1）中的镓。采用标准添加法测定的分析值与推荐值吻合较好。用上述方法测定的土壤中镓含量为20 - 50ppm，与日本土壤的报告值一致。采用电感耦合等离子体质谱法（ICP-MS）测定土壤消解物中Ga的含量。对于水样的分析，在ppt的浓度范围内得到了线性校准曲线。但在测定Ga时，由于C10分子离子存在严重的质量重叠干扰。以氯仿为溶剂，用5-辛基甲基-8-喹啉醇萃取土壤基质中的镓，再用硝酸反萃取。为了弥补提取效率的不足，建议使用同位素稀释质谱法获得土壤样品中Ga的准确结果。