1,5-二(2-羟基-5-氯苯)-3-氰基甲月替光度法测定水中锰

摘要

在pH 10的氨水-氯化铵缓冲溶液中,在聚乙二醇辛基苯基醚(OP-10)微乳液存在下,1,5-二(2-羟基-5-氯苯)-3-氰基甲月替(HCPCF)与锰形成稳定的络合物,据此建立了测定锰的分光光度法.实验表明,锰(Ⅱ)含量在0～1.0 mg/L范围内符合比尔定律,线性回归方程为A=0.002 8+0.006 9 ρ,相关系数为0.997 9,表观摩尔吸光系数为6.7×104 L·mol-1·cm-1.方法用于水中锰的测定,测得结果与原子吸收光谱法相符合,相对标准偏差(n=6)为1.3％～2.0％,加标回收率为98％～103％.%In ammonia-ammonium chloride buffer solution at pH 10,1,5-bi(2-hydroxy-5-chlorobenzene)-3-cyanoformazane(HCPCF) could react with manganese to form a stable complex in presence of polyethylene glycol octylphenol ether (OP-10) microemulsion.Based on this,a method for determination of manganese was established by spectrophotometry.The results showed that,Beer's law was obeyed for manganese (Ⅱ) in the range of 0-1.0 mg/L.The linear regression equation was A=0.002 8+0.006 9ρ with correlation coefficient of 0.997 9.The apparent molar absorptivity was 6.7 × 104 L ·mol-1 · cm-1.The proposed method was applied to the determination of manganese in water,and the results were consistent with those obtained by atomic absorption spectrometry.The relative standard deviation (n=6) was 1.3 ％-2.0 ％.The recoveries were between 98 ％ and 103 ％.