流动注射在线分离富集-石墨炉原子吸收光谱法测定氧化铅中痕量金

Determination of Micro Amount of Gold in Lead Oxide by FIA On-line Separation and Preconcentration-GFAAS

采用流动注射在线分离富集 -石墨炉原子吸收光谱法测定了氧化铅中痕量金。使用本文研究的取样杯 ,实现了流动注射装置与石墨炉原子吸收联机测定。通过在线分离富集 ,提高了分析速度 ,消除了基体干扰 ,使金的测定灵敏度提高 30倍 ,金特征量为 0 .0 6 pg,检出限为 0 .0 38pg。分析了含金量为 0 .2×1 0 -6%的试样 ,相对标准偏差 ( n=5)为 2 .6 %。

A new method for the determination of micro amount of gold in lead oxide by flow injection on line separation and preconcentration graphite furnace atomic absorption spectrometry is desciribed.Using this method,the characteristic concentration of gold is 0.06 pg/1% absorption and detection limit is 0.038 pg.The relative standard deviation is 2.6% ( n =5) for sample containing gold 0.2×10 -6 % and the recovery is 103%.