石墨炉原子吸收测定地球化学样品中痕量金

来源期刊：有色金属科学与工程2011年第6期

论文作者：赖秋祥

文章页码：89 - 92

关键词：痕量金；石墨炉原子吸收光谱仪；地球化学样品

Key words：trace gold; graphite furnace atomic absorption ; geochmical samples

摘    要：试样经灼烧，用王水加热分解，并在Fe³⁺存在下，于王水介质中用泡沫塑料吸附Au；吸附Au后的泡沫塑料再用10 g/L硫脲溶液解脱，采用斜坡升温技术在220ZS石墨炉原子吸收光谱仪测定超痕量金根据实验得出最佳分析条件，该方法捡出限为0.1 ng/g，精密度(RSD，n=12)4.2%~10.8%，经国家一级标准物质分析验证，结果与标准值相符。

Abstract:

The geochemical exploration sample was roasted and dissolved with aqua regia. The trace gold is absorbed by polyurethane foam from aqua regia medium under the presence of Fe³⁺ and released in 10 g/L thiourea solution. The trace gold is determined by GFAAS with the slope warming. The detection limit of the method is 0.1 ng/g with the precision (RSD, n,=12) of 4.2%~10.8 %. The results conform to the certified values through the national standard reference material tests.