【摘要】 采用改进的高碘酸钾氧化分光光度法对海水中Mn(Ⅱ)的含量进行了测定,研究了操作条件对测定结果的影响。结果表明:15 mL水样中,加入10 mL焦磷酸钾—乙酸钠缓冲溶液(焦磷酸钾浓度为0.24mol/L,乙酸钠浓度为0.40 mol/L),1.0 mL高碘酸钾(0.77 g/L),海水中无沉淀生成;显色时间可选择5~30 min,比色波长仍选择525 nm;Mn(Ⅱ)测定方法的工作曲线直线范围,海水为1~50 mg/L,淡水为1~30 mg/L;变异系数为0.31%~26.61%,回收率为76%~112%。更多还原

【Abstract】 The improved potassium periodate oxidation spectrophotometry was used to determine the manganese content in sea water and the reagent amount,chromogenic curves,absorption curve,the coefficient of variation and some influencing factors were evaluated.This method was found suitable for determination of manganese with the optimal range of 1 to 50 mg/L in sea water and 1 to 30 mg/L in fresh water,with variation coefficient of 0.31%-26.61% and recovery efficiency of 76%-112%.更多还原