石墨炉原子吸收光谱法测定化探样品中痕量银

来源期刊：黄金2011年第3期

论文作者：陈雪 刘烊 聂凤莲 艾晓军

文章页码：63 - 65

关键词：银； 石墨炉原子吸收光谱法； 升温条件； 优化实验

Key words：silver； graphite furnace； heating-up condition； optimization research

摘    要：对石墨炉原子吸收光谱法测定化探样品中痕量银进行了方法优化实验。以40 ng/mL银标准溶液为试样,采用斜坡升温和长寿命石墨管技术,进行了灯电流、干燥、灰化、原子化、清除温度和时间实验,得到了Z-5000原子吸收石墨炉升温的最佳条件。该方法的检出限为0.063 9 ng/mL,精密度(RSD,n=12)0.96%。实验表明,优化方法可以用于实际化探样品的测定,能有效地延长石墨管及仪器的使用寿命,并且满足地质科研需求。

Abstract: Optimization study is carried out on determining trace silver in geochemical exploration samples by atomic absorption spectrum method with graphite furnace.Taking standard silver solution of 40 ng/mL as the test sample,this paper introduces the tests of light electric current,drying,ashing,atomizing,cleaning temperature and time,using the technology of slope-heating and long life graphite tube.The optimal procedure for heating the Z-5000 graphite furnace is found out through the tests.The detection limit is 0.063 9 ng/mL and the accuracy is 0.96 %(RSD,n=12).This heating program has been applied for the determination of practical geochemical exploration samples,which can not only satisfy the experiment requirements,but also effectively extend the service life of the graphite tube and instruments.