摘要
基于铜(Ⅱ)对过氧化氢还原中性红褪色反应的强烈催化作用,建立了在表面活性剂氯化十六烷基吡啶(CPC)存在下测定痕量铜(Ⅱ)的方法。在pH 8.1氨水-氯化铵缓冲溶液介质中,以454 nm为测定波长,在120μg·L^(-1)以内吸光度ΔA(A_0—A)与铜(Ⅱ)浓度呈线性关系,方法的检出限(3S/N)为2.15×10^(-8)g·L^(-1)。方法应用于水样中铜的测定,所得结果与原子吸收光谱法测得结果相符,加标回收率在97.9%～105.7%之间。
In an ammoniacal buffer medium of pH 8,and in the presence of the surfactant CPC,the reduction of neutral red by hydrogen peroxide was strongly catalyzed by trace amount of cupric ion,leading to an enhancement of the color-fading of neutral red.Linear relationship between values of△A（i.e.A0-A） and concentration of Cu（Ⅱ） ion was kept in the range within 120μg·L^-1 as measured at the absorption maximum of 454 nm.Value of detection limit（3S/N） of 2.15×10^-8 g·L^-1 was found for the method.The proposed method was used in the determination of traces of copper in water samples giving results in consistency with the results obtained by AAS. Test for recovery was made by standard addition method,and the values of recovery found were in the range of 97.9%-105.7%.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2010年第4期359-361,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
基金
河南省教育厅自然科学研究计划项目(2008B430007)
关键词
催化光度法
中性红
铜(Ⅱ)
胶束增敏
水样
Catalytic photometry
Neutral red
Copper（Ⅱ）
Micellar sensitization
Water samples
