电化学氢化物发生-原子吸收光谱法测定不同价态的无机砷  

Electrochemical Hydride Generation-Atomic Absorption Spectrometric Determination of Inorganic Arsenic of Different Valency State

作　　者：李勋[1] 薛珺[1] 戚琦[1] 张旻杰[1] 

机构地区：[1]赣南师范学院化学与生命科学学院,赣州341000

出　　处：《理化检验（化学分册）》2007年第12期1027-1029,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：江西省教育厅科学技术研究项目(赣教技字[2007]298)

摘　　要：不同价态的无机砷在玻碳电极上具有较高的电化学氢化物发生效率,同时又存在较为明显的差异。通过选择不同的电流条件,采用电化学氢化物发生与原子吸收光谱联用技术有效地实现了无机砷的形态分析。对试验参数和干扰情况进行了研究。As(Ⅲ)和As(Ⅴ)检出限分别为0.2μg.L-1和0.4μg.L-1;对砷量为20μg.L-1的条件下作了方法的精密度试验,测定结果的相对标准偏差(n=6)对As(Ⅲ)为1.9%和对As(Ⅴ)为3.1%。应用此方法分析了人发标准物质(GBW 09101),测得总砷量与证书值相符。High rates of electrochemical hydride generation(EC-HG) of inorganic arsenic in tri-and penta-valent state were obtained at the glassy carbon cathode in the electrolytic cell.Differences in sensitivity and in slopes of calibration curves for As(Ⅲ) and As(Ⅴ) were also observed.Based on these facts and by selecting different conditions of electrolytic currents at 0.6 A and 1.2 A,EC-HG was hyphenated with AAS for the speciation analysis of inorganic arsenic.Various analytical factors,including the choice of su...

关 键 词：原子吸收光谱法 电化学氢化物发生 无机砷(Ⅲ Ⅴ) 人发 

分 类 号：O657.31[理学—分析化学]