摘要
在pH 3.1盐酸溶液和表面活性剂溴化十六烷基三甲基铵（CTMAB）存在下,铜（Ⅱ）对过氧化氢氧化甲基橙的褪色反应具有催化作用,在此基础上提出了测定痕量铜（Ⅱ）的催化分光光度法。由于添加了溴化十六烷基三甲基铵表面活性剂,灵敏度提高了2-3倍。铜（Ⅱ）的质量浓度在1.0×10^-3-4.0×10^-2mg·L^-1范围内与ΔA呈线性关系。方法的检出限（3S/N）为4.6×10-4mg·L^-1。该法用于河水中痕量铜（Ⅱ）的测定,并作回收试验,测得回收率为98.4%-103.0%,测得值的相对标准偏差（n=6）小于3%。
In a HCl solution of pH 3.1 and in the presence of CTMAB,the color-fading of methyl orange by oxidation with hydrogen peroxide was catalyzed by cupric ion,and the sensitivity of the color-fading reaction was found to be 2-3 times higher than that of the reaction in the absence of CTMAB.Based on these facts,a micelle-sensitized catalytic spectrophotometric method for determination of trace amount of copper（Ⅱ） was proposed.Linear relationship between the magnitude of decrease in absorbance ΔA（A0-A） and mass concentration of copper（Ⅱ） was obtained in the range of 1.0×10^-3-4.0×10^-2mg·L^-1.Detection limit（3S/N） found was 4.6×10^-4mg·L^-1.In the determination of traces of copper（Ⅱ） in river water sample by the proposed method,values of recovery found by standard addition method were in the range from 98.4% to 103.0%,with values of RSD′s（n=6） less than 3%.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2010年第9期1075-1077,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
基金
湖南省教育厅科研基金项目(06C744)
