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建立了碳酸盐岩样品中总硫及其硫的形态的分析方法,采用分级萃取技术提取样品中的单质硫、硫酸盐硫和硫铁矿硫,选择波长182.0nm,用ICPAES测定不同形态的硫和总硫,用差减法得到有机硫。用此方法测试了国家一级标准和10个广元地区的碳酸盐岩样品,结果表明,碳酸盐岩中总硫的浓度较大,在0.05%~2.00%之间,碳酸盐岩中硫主要以硫酸盐硫和硫铁矿硫两种形式存在,占总硫含量的90%以上,单质硫的含量较低,低于总硫含量的1%,有机硫的含量受总硫和几种无机硫的影响误差较大。样品中各形态硫的加和值与总硫测定值和总硫参考值相符,每个样品的硫测定3次,其相对标准偏差(RSD)为0.15%~3.7%。
A method for the determination of total sulfur and its sulfur in carbonate samples was established. The elemental sulfur, sulphate and pyrite were extracted by fractional extraction. The wavelength of 182.0 nm was selected. Sulfur and total sulfur, with the subtractive method to get organic sulfur. This method has been used to test the national first-class standards and carbonate samples from 10 Guangyuan areas. The results show that the total sulfur concentration in carbonate rocks is relatively large, ranging from 0.05% to 2.00% Sulfur is mainly present in two forms of sulfate and pyrite, accounting for more than 90% of the total sulfur content. The content of elemental sulfur is low, less than 1% of the total sulfur content. The content of organic sulfur is affected by total sulfur and The impact of inorganic sulfur greater error. The superaddition values of the various forms of sulfur in the sample are in agreement with those of the total sulfur and the total sulfur, and the relative standard deviations (RSDs) for each sample were determined three times, from 0.15% to 3.7%.