锌试剂褪色分光光度法测定茶叶和茶水中的锰  

Fading Spectrophotometric Determination of Manganese in Tea and Tea Liquor with Zincon

作　　者：张丽萍[1] 李伟辉[1] 王蓉[1] 马晓贝[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：《西南大学学报（自然科学版）》2008年第1期165-168,共4页Journal of Southwest University(Natural Science Edition)

基　　金：四川省教育厅科研基金资助项目(2006C096)

摘　　要：研究了锌试剂褪色光度法测定茶叶和茶水中锰含量的方法.结果表明：在一定条件下,锰含量在2.7～32.0μg/L范围内遵守比耳定律,检测限为0.14μg/L,方法的表观摩尔吸光系数为8.28×10^5L/（mol·cm）.经用于茶叶和茶水样品分析,相对标准偏差（RSD）为1.9%～3.4%,回收率为94.7%～103.1%.结果令人满意.In a study reported in this paper, manganese in tea and tea liquor was determined by fading spectrophotometry with zincon, a color-developing reagent normally used to determine zinc. Under certain conditions, manganese, in a concentration range of 2.7-32.0 μg/L, was shown to obey Beer＇s law, with a detection limit of 0.14 μg/L and an apparent molar absorptivity of 8.28 × 10^5 L/（mol · cm）. In the analyses of tea and tea liquor samples, RSD was 1.9%-3.4%, and the recovery rate was 94.7%-103.1%, which results were satisfactory.

关 键 词：锌试剂 锰 褪色光度法 茶叶和茶水 

分 类 号：O657.32[理学—分析化学]