催化分光光度法测定地质样品中微量镓  

Determination of Trace Gallium in Geological Samples by Catalytic Photometric Method

作　　者：乐淑葵[1] LE Shukui(Test Institute Jiangxi Provincial Institute of Geological Survey, Nanchang ,Jian gxi 330030,Chin)

机构地区：[1]江西省地质调查研究院测试所,南昌330030

出　　处：《中国无机分析化学》2018年第3期12-15,共4页Chinese Journal of Inorganic Analytical Chemistry

摘　　要：在25mL反应体系中加入3.0mL硫酸(1.0mol/L)-盐酸(5.0mol/L)混合酸,3.0mL碘酸钾溶液(0.05mol/L),1.5mL胭脂红溶液(0.50g/L),微量镓对碘酸钾氧化胭脂红的褪色反应有良好的催化作用,为此建立了测定地质样品中微量镓的催化分光光度法。方法的线性范围在0~100μg/L,工作曲线的线性方程ΔA=2.369CGa+0.223 6(相关系数r=0.999 6),检出限(3S/N)为1.0×10^(-3)μg/mL。方法应用于地质标准样品中微量镓的测定(分别是岩石标准样品GBW07120和水系沉积物标准样品GBW07301a),测定值与认定值相符,测定值相对标准偏差(n=6)均小于5%,结果满意。In the present paper,the catalytic spectrophotometric method for the determination of trace gallium in geological samples is proposed.This method based on the catalytic effect of trace Gallium on discoloring reaction of carmine oxidized by potassium iodate in the 25 mL reaction system.The mixture of sulfuric acid and hydrochloric acid solution（H2 SO4：1.0 mol/L,HCl：5.0 mol/L）3 mL,0.05 mol/L potassium iodate solution 3.0 mL,and 0.50 g/L carmine solution 1.5 mL were added.The linear range of this method was 0—100μg/L for Gallium.The linear equation wasΔA=2.369 CGa＋0.223 6（r=0.999 6）and the detection limit（3 S/N）was 1.0×10^（-3）μg/mL.The method was applied to the determination of trace Gallium in geological standard samples（rock standard sample GBW07120 and water system sediment sample GBW07301 a）.Results were consistent with the certified values,and values of the relative standard deviation（RSD）（n=6）were less than 5%.

关 键 词：镓 催化分光光度法 胭脂红 碘酸钾 

分 类 号：O657.32[理学—分析化学] TH744.12[理学—化学]