延安市延河水中微量铅的测定  

Determination of Trace Lead in Yanhe Water of Yanan City

作　　者：孙雪花[1] 高志均[1] 苏彩琴 张玉粉 

机构地区：[1]延安大学化学与化工学院 [2]延安市宝塔区二中,陕西延安716000 [3]甘泉县高级中学,陕西甘泉718000

出　　处：《延安大学学报（自然科学版）》2009年第4期72-74,共3页Journal of Yan'an University：Natural Science Edition

基　　金：延安大学校内专项基金(YDK2006-25)

摘　　要：在pH为13.00的KCl-NaOH缓冲体系中,铅与苯基荧光酮生成稳定的1∶1有色络合物,其吸光度值与铅的浓度成正比,据此建立了测定微量铅的简单方法。其表观摩尔吸光系数为5.27×104L.mol-1.cm-1,最大吸收波长为595 nm,检出限为0.0055 mg/L,铅含量在0.012-3.2mg/L范围内遵守比尔定律,其线性回归方程为A=0.2672C-0.0262（C：mg/L）,相关系数r=0.9994。本方法用于测定延河水中的痕量铅,并与经典的原子吸收方法相比较,结果满意。In the buffer solution of KCl-NaOH（pH=13）,a stable complex of lead（Ⅱ） with phenylfluorone（PF） was formed.The apparent molar absorptivity of color complex was 5.27×104 L·mol-1·cm-1.The maximum absorption wave length was at 595 nm.The molar ratio of lead to PF incomplex was 1：1.Beer s law was obeyed in the range of 0.012～3.2 mg/L for lead（Ⅱ） and the limit of detection was 0.0055mg/L.The regression equation was A=0.2672C-0.0262（C：mg/L） and a relative coefficient of 0.9994 was found.The method was A = 0. 2672C- 0. 0262（C：mg,/L） and a relative coefficient of 0. 9994 was found. The method was convenient and sensitivity. It has been applied to the determination of trace lead in some water samples with satisfactory results.

关 键 词：分光光度法 铅 苯基荧光酮 

分 类 号：O65[理学—分析化学]