地质样品铂族元素及Re-Os同位素分析进展
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摘要
精确测定地质样品中低含量的铂族元素及Re(统称为强亲铁元素)一直是项艰难的工作。近年来地质分析工作者在铂族元素和Re-Os同位素样品的消解、分离富集方法以及仪器测定方法等方面作了大量工作。提高了样品量,降低了块金效应;全流程空白值的降低使得检出限得到了大大改善;分析流程更加简便;ICP-MS、MC-ICPMS及TIMS等高灵敏度及高精度仪器的出现使得分析结果更加可靠。这些分析方法的改进使得超低含量的铂族元素及Re-Os同位素分析成为可能。随着地球科学的不断发展,对地质样品铂族元素及Re-Os同位素分析的要求将越来越高,要求达到更低的检测限。样品的高效引入、分析流程的简化以及高灵敏度、高精度的检测手段将是今后的发展方向。本文对近年来地质样品中铂族元素及Re-Os同位素分析中所涉及的样品消解、分离富集方法及测定方法等研究成果进行了评述。
Accurate determination of platinum group elements and Re,known as highly siderophile elements(HSE),always are difficult tasks.A lot of works of sample digestion,pre-concentration and instrumental measurement for determination of PGE and Re-Os have been reported in the last decade.The sample mass was increased to reduce the nugget effect.The procedure blank was reduced and thus the detection limits were improved.The using of high sensitivity and precision instruments of ICP-MS、MC-ICPMS and TIMS makes the results more reliable.To meet the development of earth science,the requirement of detection limits for PGE and Re-Os will be much lower in the future.High efficiency of sample introduction,simplified the sample pretreatment and using high sensitive and precise instruments are the future direction for PGE and Re-Os analyses.In this paper,methods of sample digestion,pre-concentration and instrumental measurement for platinum-group elements and Re-Os isotopes are reviewed.
Accurate determination of platinum group elements and Re,known as highly siderophile elements(HSE),always are difficult tasks.A lot of works of sample digestion,pre-concentration and instrumental measurement for determination of PGE and Re-Os have been reported in the last decade.The sample mass was increased to reduce the nugget effect.The procedure blank was reduced and thus the detection limits were improved.The using of high sensitivity and precision instruments of ICP-MS、MC-ICPMS and TIMS makes the results more reliable.To meet the development of earth science,the requirement of detection limits for PGE and Re-Os will be much lower in the future.High efficiency of sample introduction,simplified the sample pretreatment and using high sensitive and precise instruments are the future direction for PGE and Re-Os analyses.In this paper,methods of sample digestion,pre-concentration and instrumental measurement for platinum-group elements and Re-Os isotopes are reviewed.
引文
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