摘要
采用自行研制的以铅作阴极、石墨作阳极无隔膜分隔的流通式电化学氢化物发生器,电解产生的气体经气液分离器后直接送入火焰原子吸收进行测定,因无外加载气减少了稀释提高了灵敏度.研究了各种影响因素,选择了最佳条件,以0.5 mol/L硫酸作电解液,以1.3 mL/min流速通过氢化物发生器,电解电流为2.0A.结果表明硒质量浓度在0～5 μg/mL范围内呈良好的线性关系,其相关系数为0.998 8,相对标准偏差为4.4%,特征质量浓度为0.039 7 μg/mL,检出限为0.084μg/mL.
The self-made flow-through cell with lead as the cathode and graphite as the anode was used as the electrolytic generator of volatile selenium hydride. There are no membrane between the cathode and the anode. The gases containing selenium hydride produced from the cell were directly determined by FAAS after sep- arating by a phase separator. The sensitivity of the method was enhanced without using the carrier gas. The optimmn electrolyte was 0.5 mol/L H2SO4, the flow rate 1.3 mL/min and the electrolytic current 2.0 A. The absorbance was linear with selenium concentration in the range of 0 - 5μg/mL with r = 0. 998 8. The characteristic concentration was 0. 039 7μg/mL and the detection limit was 0. 084μg/mL. The RSD was 4.4%.
出处
《分析测试学报》
CAS
CSCD
北大核心
2005年第5期69-71,共3页
Journal of Instrumental Analysis
基金
浙江省分析测试基金资助项目(04128)
关键词
电化学
氢化物发生法
硒
原子吸收
Electrochemical
Hydride generation
Selenium
Flame atomic absorption spectrometry
