新氯气校正法测定废水中化学需氧量的方法研究

摘要

Heating reflux the sample for 2 h with known amount of potassium dichromate solution,and the strong acid medium with silver sulfate as catalyst. The chlorine ions in the sample were oxidized to chlo-rine, then exhaust to the absorption bottle with a known amount of ammonium ferric sulfate standard solution by N2, the solution in the absorption bottle and the triangle bottle will be ransferred to the other triangle bot-tle after colling. The rest of the potassium dichromate will be titrated with ammonium ferrous sulfate standard solution, using 1,10-phenanthroline as indicator. Mass COD of the sample by titration consumption.%在水样中加入已知量的重铬酸钾溶液，在强酸介质下以硫酸银作催化剂，加热回流2 h，水样中被氧化的氯离子形成氯气后随 N2导入装有已知量的硫酸亚铁铵标准溶液的吸收瓶中，待溶液冷却后，将吸收瓶和三角瓶中溶液全部转移至另一个三角瓶中，以1,10-邻菲罗啉为指示剂，用硫酸亚铁铵标准溶液滴定未被还原的重铬酸钾，由滴定消耗用量换算为消耗氧的质量浓度，即为该水样的化学需氧量。