气相色谱法分析三氯甲烷形成量影响因素研究

Research on the affecting factor of chloroform formation by headspace gas chromatography

通过水中三氯甲烷形成量试验研究和正交试验分析,单独应用二氧化氯对水进行消毒时,较高COD含量的水样与较高浓度二氧化氯相接触,不形成三氯甲烷;单纯用次氯酸钠时,随水中COD浓度、pH值、氯投加量升高,三氯甲烷形成量增加;COD、pH值、氯与二氧化氯投加量均是影响三氯甲烷形成量的显著因素;影响因素显著性排序从大到小依次为氯与二氧化氯投加量、COD浓度、pH值;二氧化氯与氯复配使用抑制三氯甲烷生成,提高二氧化氯含量是降低水中三氯甲烷形成量的行之有效的手段。

The affecting factors （COD,pH and dosage of chloride） on the chloroform is analyzed by the orthogonal experiments. It is concluded that the production increases with rising COD, pH,and chlorine dosage when using NaCIO for water disinfection only. COD, pH,and chlorine dosage are remarkable affecting factors in water disinfection when using chlorine dioxide and NaCIO together, and every level of factors has remarkable difference, The order of marked factor from large to small is chlorine dosage,COD, pH. A combined use of chlorine dioxide and chlorine can inhibit the formation of chloroform. It is a effective measure to decrease the level of chloro-form formation by using chlorine dioxide.