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.
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)
关键词
分光光度法
铅
苯基荧光酮
spectrophotometry
lead
phenylfluorone
