摘要
本文提出一种测定痕量钼的微分吸附计时电位法。利用悬汞电极作为工作电极，在０．１２ｍｏｌ／ＬＨＡＣ－０．０１ｍｏｌ／ＬＮａＡｃ－３．２×１０￣（－６）ｍｏｌ／Ｌ茜素红的最佳底液中，测定钼的线性范围为０．４ｎｇ／ｍＬ～７０ｎｇ／ｍＬ，吸附富集３ｍｉｎ检测下限可达０．１ｎｇ／ｍＬ。探讨了影响方法灵敏度的主要因素，初步研究了电极过程，利用该方法直接测定了粮食样品中钼的含量。
An electroanalytical method for the determination of trace amounts of molybde-num,based on derivative chronopoten-tiometry of molybdenum( Ⅵ )-alizarin redcomplex accumulated adsorptively on thesurface of a hanging mercury drop electrodehas been developed. Optimum experimentalconditions include 0. 12 mol/LHAc,0.01mol/LNaAc,3. 2× 10￣(-6)mol/LA.R.,andapreconcentration potential of +0.20V(vs.SCE).Under these condkions,thedetectionlimit and thelinear range are 0.1ng /mL and0.4ng/mL～70ng/mL,respectively,for anaccumulation time of 3min。The method wasapplied to food samples
出处
《分析试验室》
CAS
CSCD
北大核心
1996年第1期63-66,共4页
Chinese Journal of Analysis Laboratory
关键词
钼
茜素红
电位法
粮食
Molybdenum
Alizarin red
Derivative adsorption chronopotentiometry
