石墨炉原子吸收测定地球化学样品中痕量金

Determination of trace Au in geochemical exploration samples by GFAAS

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，该方法检出限为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 0.1ng/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.