利用基体改进效应—无火焰原子吸收测定矿石中微量镓

Determination of Ga in Rocks by Flameless AAS Using Matrix Correction

关于矿石中微量镓的测定方法,以前一般采用化学比色法或光谱法。比色法其灵敏度较高,但分析手续冗长,且取样量较多,不宜于一般单矿物中镓的测定。近年来,随着原子吸收光谱分析技术的发展,有关镓的火焰[2]及无火焰的测定已有所报导[3-5],以萃取分离的方法,基本上解决了单矿物样少及矿石中低含量镓的测定,但同样存在着分析手续繁琐的问题。

The matrix correction is suggested for determining Ga by flameless aas.The background is corrected by adding 1mg/ml Ni using D2 lamp in 2%nitric acid medium.The sensitivity of this method is 8.8x10~2g/1%Its C.V.for sample containing 0.02ppm of Ga is 1.81%(n=11).The recoveries obtained by addition of standard Ga-solution are over 90%.The measurable concentration range is 0.000x-0.00x%Ga.