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Determination of Chemical Oxygen Demand in Aqueous samples by AAS
Author(s): 
Pages: 90-92
Year: Issue:  3
Journal: ANALYTICAL LABORATORY

Keyword:  原子吸收法化学需氧量环境分析;
Abstract: 在 H2SO4 介质中用 K2Cr2O7 同 COD 水样反应,反应后水相中过量的 Cr(Ⅵ) 以 Cr2O2-7 形式被 TOA 萃入有机相中,而生成的 Cr(Ⅲ) 则留在水相,用 AAS测定有机相中的 Cr(Ⅵ)或水相中的 Cr(Ⅲ) 都可求得 COD 含量.本法简便快速、需样量少、且测定结果同标准方法 (CODCr法)一致,回收率为 98%~108%,平均标准偏差为 3.3%.
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