铋B-芦丁体系的微分吸附计时电位法研究  

A Study on the Derivative Adsorption Chronopotentiometry of the Bismuth B-Rutin System

作　　者：赵敬中[1] 姚型军[1] 孙德志[1] 

机构地区：[1]聊城大学化学化工学院,聊城252059

出　　处：《分析化学》2004年第7期946-948,共3页Chinese Journal of Analytical Chemistry

摘　　要：提出一种测定痕量铋的微分吸附计时电位法。利用悬汞电极作工作电极 ,置富集电位于 0 .10V ,在0 .0 15mol/LHAc 0 0 0 5mol/LNaAc 7.5× 10 -7mol/L芦丁的底液中 ,测定铋 的线性范围为 1.0× 10 -10 ～7 5× 10 -8mol/L ,检出限为 5× 10 -11mol/L。探讨了影响方法灵敏度的主要因素 ,研究了电极过程。利用此法测定了中草药样品中的铋含量 ,结果满意。An electroanalytical method for the determination of trace amounts of bismuth,based on derivative chronopotentiometry of bismuth-rutin complex adsorptively accumulated on the surface of a hanging mercury drop electrode (HMDE) has been developed. Optimum experimental conditions include 0.015 mol/L HAc,0.005 mol/L NaAc,7.5×10 -7 mol/L rutin,and a preconcentration potential of 0.10 V( vs .SCE).Under these conditions,the detection limit and the linear range are 5 ×10 -11 mol/L and 1.0×10 -10 ～7.5×10 -8 mol/L,respectively,for an accumulation time of 3 min.The method has been used to determine the amount of bismuth in traditional Chinese medicine (medical herb)with satisfying result obtained. The electrochemical behavior of bismuth-rutin complex at the HMDE was also investigated.

关 键 词：铋 芦丁 微分吸附计时电位法 痕量分析 中草药 含量测定 

分 类 号：O657.1[理学—分析化学]