海水中有机污染物的光度法测定

Spectrophotometric determination of organic pollutant in sea water

海水中有机污染物在强碱性条件下被KMnO4所氧化。通过对生成物溶液中K2MnO4浓度的光度法测量（λ=430nm），直接测定海水中有机物含量（以COD表示）。该方法的线性范围为0．40—4．50mg／L（以邻苯二甲酸氢钾＋甲酸钠体系为标准混合物溶液），测定海水COD的相对标准偏差RSD为8．9％，回收率为90％～114％。

Organic pollutant in seawater was oxidized by KMnO4 in 2 mol/L NaOH solution. KMnO4 was reduced to K2 MnO4.The content of organic pollutant（COD） in sea water was indirectly obtained by spectrophotometric determination（λ = 430 nm） of K2 MnO4 concentration. The linear range of this method is 0.4 - 4.5 mg/L, RSD is 8.9 %. The recovery is 90% ～114%