Abstract：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 %.
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JIN Wen-bin. Determination of manganese in water by 1,5-bi(2-hydroxy-5-chlorobenzene)-3-cyanoformazane spectrophotometry. , 2013, 33(6): 56-58.
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