石墨炉原子吸收光谱法测定钮扣电池中痕量金

Determination of trace gold in button batteries using graphite furnace atomic absorption spectrometry

样品经王水溶解,聚氨酯泡沫塑料分离富集后,用20g/L硫脲溶液解析,20g/L抗坏血酸溶液作基体改进剂,采用石墨炉原子吸收光谱测定钮扣电池中痕量金。优化了石墨炉的测定条件,采用700℃和1 700℃作为灰化和原子化温度,缩短了测定时间,延长了石墨管的使用寿命。测定结果显示钮扣电池中金含量低于10ng/g,RSD低于10%,回收率在88%～112%之间,方法检出限为0.15ng/g,该法适合电子元器件中痕量金的测定。

The sample was dissolved by aqua regia,foam separated and enriched by polyurethane,and then analyzed by thiourea solution of 20 g/L.A method for determination of trace gold in button batteries by graphite furnace atomic absorption spectrometry was established.The gold was determined with ascorbic acid solution of 20 g/L as matrix modifier.The detection conditions of graphite furnace atomic absorption spectrometry was optimized with 700 ℃ and 1 700 ℃ as ashing and atomization temperature,respectively,which shortened the measurement time and extended the life of graphite tube.The results showed that the gold element in button batteries was less than 10 ng/g,RSD was less than 10 % and the recovery was between 88 % and 112 %.Detection limit was 0.15 ng/g.The method was suitable for determination of trace gold in electronic components.