分光光度法测定中国市售黄金饰品中六价铬的含量  

Spectrophotometric Determination of Chromium(Ⅵ)in Golden Adornments on Domestic Market

作　　者：龚诚[1] 伏荣进 杨寅[1] 王亮[1] 王鑫磊[1] 王浩杰[1] 华毅超[1] 

机构地区：[1]南京市产品质量监督检验院国家金银制品质量监督检验中心(南京),南京210028

出　　处：《理化检验（化学分册）》2016年第10期1197-1200,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：南京市质量技术监督局重点科技项目(kj2014005)

摘　　要：采用分光光度法测定中国市售黄金饰品中六价铬的含量。采取四分法均匀取样,样品以碱性提取液浸出。浸出液中的铬（Ⅵ）在微酸性条件下与二苯碳酰二肼试剂反应生成紫红色络合物,于波长540nm处测量其吸光度。六价铬的质量浓度在0.5mg·L^-1以内与其吸光度呈线性关系,检出限（3s）为0.001mg·L^-1。加标回收率在98.0%~100%之间,对六价铬质量浓度分别为0.05,0.10 mg·L^-1的模拟样品溶液,分别测定11次,测定值的相对标准偏差分别为0.37%,0.27%。Spectrophotometry was applied to the determination of chromium（Ⅵ） in golden adornments on domestic market. Sampling by quartering was adopted. The sample was extracted with an alkaline extractant, and Cr（Ⅵ） in the extract was reacted with diphenyl carbazide in a weakly acidic medium to form a violet complex, the absorbance of which was measured at 540 nm. Linear relationship between values of absorbance and mass concentration of chromium（Ⅵ） was obtained in the range within 0.5 mg·L^-1, with detection limit （3s） of 0.001 mg·L^-1. Values of recovery found by standard addition method were in the range of 98.0%-100%. Precision of the method was tested at concentration levels of 0.05, 0.10 mg·L^-1 of Cr（Ⅵ） in simulated sample solution for 11 determinations, values of RSD′s found were 0.37%,0.27% respectively.

关 键 词：分光光度法 六价铬 黄金饰品 

分 类 号：O657.32[理学—分析化学]