苏丹红Ⅰ褪色分光光度法测定环境水体中六价铬  

Determination of Chromium(Ⅵ) in Environment Samples with Sudan Ⅰby the Fading Spectrophotometric

作　　者：沙鸥[1,2] 李亚鑫[1] 周妘 张思亮 

机构地区：[1]淮海工学院化学工程学院,江苏连云港222005 [2]江苏省海洋资源开发研究院分析测试中心,江苏连云港222001

出　　处：《湖北农业科学》2013年第3期671-673,共3页Hubei Agricultural Sciences

基　　金：国家自然科学青年基金项目(21101069);2011年度江苏省海洋资源开发研究院科技开放基金立项项目(JSIMR11B26);淮海工学院2011年自然科学类校内课题(Z2011020)

摘　　要：在盐酸介质中,依据六价铬离子(Cr(Ⅵ))氧化苏丹红Ⅰ使其褪色的原理提出了测定Cr(Ⅵ)离子的新方法,确定了最优的测定条件。在485 nm处,Cr(Ⅵ)离子在0.2～2.6μg/mL范围内符合比尔定律,线性回归方程为A=0.207 0C+0.002 35,相关系数为0.996 0,表观摩尔吸光系数为6.09×104L/(cm.mol)。该方法可用于水样中的微量Cr(Ⅵ)离子的测定,回收率为97.1%～100.3%,RSD小于3.0%。A new spectrophotometric method for the determination of micro-amounts of Chromium(VI) was proposed based on the oxidation of Sudan Ⅰ by Chromium(Ⅵ) in hydrochloric acid medium.The optimal conditions were studied.The maximum absorption of Sudan Ⅰ was at 485 nm.The decrease of absorbance of Sudan Ⅰ resulted from its oxidation by Chromium(Ⅵ),and the linear relationship was established between the decrease of absorbance and Chromium(Ⅵ) concentration of 0.2～2.6 μg/mL.The equation of linear regression was A=0.207 0 C+0.002 35,coefficient of correlation was 0.996 0,apparent molar absorption coefficient was 6.09×104L/cm.mol.The proposed method had been applied to oletermine Chromium(VI) in water samples,and the recovery rate was 97.1%～100.3% and the RSD was less than 3.0%.

关 键 词：苏丹红Ⅰ 六价铬 分光光度法 

分 类 号：S[农业科学]