铬黑T分光光度法测定饮料中痕量镍  

Spectrophotometric Determination of Trace Amount of Nickel in Drinks with Eriochrome Black T as Chromogenic Reagent

作　　者：斯琴高娃[1,2] 王立华[3] 王宁[1] 陈梦琪[1] 陈葛[1] 

机构地区：[1]淮海工学院化学工程学院,连云港222005 [2]江苏省海洋资源开发研究院,连云港222005 [3]河北北方学院应用化学研究所,张家口075000

出　　处：《理化检验（化学分册）》2013年第6期735-737,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：国家自然科学基金青年科学基金项目(21101069);江苏省海洋资源开发研究院科技开放基金项目(JSIMR07);江苏省高校优势学科建设工程项目;淮海工学院2012年度大学生创新训练项目

摘　　要：在pH 10.0的硼酸-氯化钾-氢氧化钠缓冲溶液中,显色剂铬黑T[1-(1-羟基-2-萘偶氮)-6-硝基-2-萘酚-4-磺酸钠]与镍(Ⅱ)形成稳定络合物。其最大吸收波长位于533nm处,表观摩尔吸光率为5.19×104L·mol-1·cm-1。镍(Ⅱ)的质量浓度在1.2mg·L-1范围内与吸光度呈线性关系。方法用于饮料样品中微量镍(Ⅱ)的测定,测定值与原子吸收光谱法测定结果一致,回收率在99.6%～100%之间,相对标准偏差(n=9)在1.4%～1.9%之间。In a H2B4O7-KCl-NaOH buffer solution of pH 10.0,a stable coordination complex was formed by the reaction of Ni（Ⅱ） with sodium 1-（1-hydroxy-2-naphthylazo-6-nitro-2-naphthalene-4-sulfonate as chromogenic reagent,having its absorption maximum at the wavelength of 533 nm.Value of apparent molar absorptivity was found to be 5.19×104L·mol-1·cm-1.Linear relationship between values of absorbance and mass concentration of Ni（Ⅱ） was in the range within 1.2 mg·L-1.The proposed method was applied to the determination of Ni（Ⅱ） in drink samples,giving results in consistency with those obtained by AAS.Values of recovery and RSD′s（n=9） found were in the ranges of 99.6%-100% and 1.4%-1.9%,respectively.

关 键 词：分光光度法 饮料 镍(Ⅱ) 

分 类 号：O657.31[理学—分析化学]