【摘要】 利用Fe3+催化氧化邻苯二胺(o-PDA),研究了分光光度法测定o-PDA的最佳实验条件和干扰去除方法。研究表明,在稀HCl介质中,显色体系最佳pH=3.0;λmax=450 nm;方法的线性范围0~8 mg/L,线性回归方程A=0.011 4C+0.037 2,相关系数r=0.999 6;体系的摩尔吸光系数ε=1.22×104L.mol-1.cm-1;方法的检测下限为0.015 mg/L,动力学研究表明显色反应为一级,dA/dt=0.007 5A-0.011 67,r=0.999 5。用硫酸铜沉淀去除农药生产废水中的干扰后测定水中的o-PDA,结果满意。更多还原

【Abstract】 From the color developing reactions of O-Phenylenediamine oxidizing agent and Fe(Ⅲ),the reactions between both of them in HCl medium were studied using spectropotometric method.Optimum condition of the reaction was established as pH 3.0 and λmax=450 nm.A linear relationship was obtained between the absorbency and the concentration of o-PDA in the range of 0～8 mg/L.The detection limit was 0.015 mg/L.The kinetic law of the reaction system was studied.The reaction was found to be first class,dA/dt=0.007 5A-0.011 67,r=0.999 5.The results was satisfactory.更多还原