摘要
本文研究了硒(Ⅳ)与3,5-二溴代邻苯二胺的反应产物4,6-二溴代苤硒脑的吸附溶出行为。发现在稀硝酸底液中,在悬汞电极上于-0.73V(vs.Ag/AgCl)附近有一灵敏的吸附阴极溶出峰,可应用2.5次微分新极谱法测定痕量硒。在富集6min条件下,硒(Ⅳ)浓度在0.05～100ppb范围内与峰高有良好的线性关系,检出限可达5×10^(-3)ppb。利用本法测定美国NBS小麦面粉标样(SRM-1567)及我国人发对比试样A,结果均与推荐值相符。
In this paper, the adsorption stripping behaviour of 4,5-dibromopiaselenole (4,6-diBr-PIS) obtained from the reaction of Se(Ⅳ) with 3,5-dibromo-o-diamm obenzene in several media were studied. In dilute nitric acid solution, 4,6-diBr-PIS give a sensitive adsorptive cathodic stripping wave at about -0.73 v(vs.Ag/AgCl electrode) on a hanging mercury electrode. This wave could be used for the determination of trace selenium by sensitive adsorptive stripping voltammetry. Under the condition of enrichment for 6 minutes, there is a good linear relationship between the peak height and concentration of selenium (Ⅳ) in the range of 0.05~100 ppb Se(Ⅳ) by 2.5 order neopolarography, and the detection limit is 5×10^(-3)ppb. Total selenium in the standard sample of wheat flour of American NBS(SRM-1567), and reference sample A of hair prepared by Jiangsu Institute of Medicine, were determined successfully by this method. The results are in good agreement with the certified values, and good recoveries were obtained.
出处
《分析试验室》
CAS
CSCD
北大核心
1990年第6期49-52,共4页
Chinese Journal of Analysis Laboratory
基金
国家自然科学基金资助课题
