茶叶中铅含量分析方法研究  

STUDY ON THE ANALYSIS METHOD OF LEAD CONTENT IN TEA

作　　者：张丽萍[1] 李伟辉[1] 蒋小云[1] 

机构地区：[1]四川理工学院材料与化学工程系,四川自贡643000

出　　处：《食品研究与开发》2008年第12期99-101,共3页Food Research and Development

基　　金：四川省教育厅科研基金项目(NO.2006C096)

摘　　要：研究分光光度法测定茶叶中铅含量的方法。显色剂4-(2-吡啶偶氮)-间苯二酚(PAR)与铅反应形成二元络合物。结果显示,铅含量在0.0mol/L～2.8×10-5mol/L范围内,符合朗伯―比耳定律,方法的表观摩尔吸光系数为3.26×104L(/mol·cm),相关系数r为0.9983,精密度(RSD)小于2.2%,检出限为1.1mg/L,加标回收率在94.9%～104.2%之间,符合分析要求。The spectrophotometry method for determination of lead in tea was studied in this paper. 4-（2-Pyridylazo）resorcinol （PAR） was used as reagent to form binary complex , and then measure the absorbance of this compound. The results showed that Lambert-Beer＇s law is obeyed in the range of 0.0 mol/L-2.8×10^-5 mol/L for lead. The apparent molar absorptivity is 3.26×10^4 L/（mol ·cm）. The correlation coefficient is 0.998 3, the relative standard deviations （R.S.D） is 2.2 %,the detection limit is 1.1 mg/L, and the recovery of standard addition was from 94.9 % to 104.2 %, according to the requirements of analysis.

关 键 词：分光光度法 茶叶 铅 4-(2-吡啶偶氮)-间苯二酚 

分 类 号：TS272.7[农业科学—茶叶生产加工] O657.31[轻工技术与工程—农产品加工及贮藏工程]