黑色页岩贵金属成分分析标准物质研制

Development of reference materials for composition analysis of precious metals in black shale

黑色岩系是多种有用元素的重要载体,某些黑色岩系中的贵金属元素异常富集,其含量甚至超过了部分基性和超基性岩。目前,国内外尚未有可用的黑色页岩贵金属成分分析标准物质。本文研制了2个黑色页岩贵金属成分分析标准物质(HSYY-G1、HSYY-H2),候选物样品采自贵州遵义和湖南庄家峪。随机抽取样品进行均匀性、稳定性检验,F实测值均小于F0.05(29,60)=1.65,且相对标准偏差均小于10%,表明样品均匀性良好。在稳定性考察期内,未发现统计学意义的明显差异,表明样品稳定性良好。通过多家协作实验室采用电感耦合等离子体质谱法(ICP-MS)、原子吸收分光光度法(AAS)、紫外可见分光光度法(COL)等比较有针对性的定值方法来确保黑色页岩贵金属元素定值的准确性。该批标准物质的研制,对黑色页岩中贵金属矿产资源的综合开发利用具有促进作用。

Black rock series are important carriers of various useful elements,and some have abnormally enriched precious metal elements,even with a content exceeding that in some basic and ultrabasic rocks.At present,there are no reference materials available both domestically and internationally for composition analysis of noble metals in black shale.Two such reference materials(HSYY-G1 and HSYY-H2)have been developed in our work with candidate samples taken from Zunyi,Guizhou and Zhuangjiayu,Hunan.Randomly selected samples were used for uniformity and stability tests and the measured values of F were all less than 1.65 for F0.05(29,60),with relative standard deviations of less than 10%,indicating good sample uniformity.During the stability assessment period,no statistically significant differences were found,suggesting good sample stability.An inductively coupled plasma mass spectrometry(ICP-MS),atomic absorption spectrometry(AAS),ultraviolet visible spectrophotometry(COL)and other relatively targeted value determination methods were adopted in several collaborative laboratories to ensure the accuracy of the determination of precious metals in black shale.This batch of standard materials will be very useful in actual analysis of precious metals in black shale.