摘要
本文在少量氯化钠存在下的磷酸－磷酸二氢钾缓冲溶液（ｐＨ＝２．７）中，以铜（Ⅱ）催化次磷酸钠还原罗丹明Ｂ褪色为指示反应，建立了痕量铜的动力学光度分析新方法。在沸水浴中加热反应１０ｍｉｎ，测定的线性范围为０～０．４０μｇ／２５ｍＬ铜（Ⅱ），回归方程为ΔＡ＝１．９７５ｃ＋０．００３，相关系数为０．９９８９；以ΔＡ＝０．０１计算得测定下限为０。００５μｇ／２５ｍＬ。方法应用于铅基合金、纯铅粉和标准镁合金中铜的测定，结果满意。
new catalytic spectrophotorometricmethod has been developed for the determi-nation of trace copper. It is based on reduc-ing decoloration of rhodamine B with sodiumhypophosphite in sodium chloride and phos-phoric acid buffer solution(pH=2. 7). Thereaction is allowed to runs for 10 minutes ina boiling water bath,the range of determina-tion is 0. 005～0.40μg/25mL copper and theregression equation of calibration graph isΔA=1. 975c+0.003 with a correlation coef-ficient of 0. 9989. This method was appliedto determine copper in lead alloy,lead pow-der and magnesium alloys with satisfactoryresults.
出处
《分析试验室》
CAS
CSCD
北大核心
1996年第2期37-39,共3页
Chinese Journal of Analysis Laboratory
关键词
铜
罗丹明B
光度法
催化动力学分析
Copper determination
rho-damine B
reducing decoloration
kineticanalysis
catalytic spectrophotometry
