混合表面活性剂-铬天青S与铜显色反应研究及应用

Research and Application of Color Reaction of Mixed Surfactant-CAS and Copper

在曲拉通X-100(Triton X-100)和乳化剂(OP)存在下,基于Cu2+-铬天青S(CAS)的显色反应,建立了分光光度法测定微量铜的新方法。通过Cu2+与CAS-Triton X-100-OP形成灵敏度较高的多元配合物,来测量铜含量。络合物的最大吸收波长为618nm,表观摩尔吸光系数为ε=6.62×105L.mol-1.cm-1,Cu2+含量在0—20μg/25mL范围内服从比耳定律,线性回归方程为A=0.039ρ+0.0078,r=0.9993,干扰离子较少。已用于绿豆中铜含量的测定,结果令人满意。

Based on the color reaction of Cu2＋ and CAS in the presence of Triton X100 and OP,the method for determination of trace copper by spectrophotometry was developed.Cu2＋ and CAS-TritonX-100-OP formed polybasic complexes with higher sensitivity to measure the content of copper.The maximal absorption wavelength of the complex was at 618nm with apparent molar absorptivity of 6.62×105L·mol-1·cm-1.The content of Cu2＋ obey Beer law in range of 0—20μg/25mL.The regression equation was A=0.039ρ＋0.0078 with r=0.9993.There was less interfering ion.The method is applied to the determination of trace copper in mung with satisfactory results.