化探样品中石墨炉痕量金测定技术研究

Study on the Determination Technology of Trace Gold in Geochemical Exploration Samples by Graphite Furnace

为实现对化探样品中石墨炉痕量金的测定,本文开展了对其测定技术的相关研究。本研究实验分析方法在Fe3+存在条件下,在质量分数为10%的王水中,利用泡沫塑料吸附金;在质量分数为1.2%的硫脲溶液中解析;采用最大功率升温和石墨炉原子吸收光谱测定方法。通过对测定结果进行分析可以得出,该分析方法检出限低,测定结果的精密度和准确度均能够满足国家一级标准物质分析验证要求,确保测定结果与真实标准值相符合。

In order to achieve the determination of trace gold in graphite furnace in geochemical exploration samples,relevant research has been carried out on its determination technology.In the presence of Fe3+,gold is adsorbed by foamed plastics in aqua regia with a mass fraction of 10%;resolved in a thiourea solution with a mass fraction of 1.2%;the maximum power heating and graphite furnace atomic absorption spectroscopy are used for the determination.Through the analysis of the measurement results,it is found that the detection limit of this method is low,and the precision and accuracy of the measurement results can meet the requirements of national first-class standard substance analysis and verification,ensuring that the measurement results are consistent with the true standard values.