摘要
建立了对氨基二甲苯胺分光光度法测定水中余氯的新方法。利用氯气在一定条件下能氧化对氨基二甲苯胺使其成为红色的氧化态形式 ,可以定量测定氯 ,实验条件如下 :最大吸收波长为5 2 0 nm ,p H控制在 2 .5～ 4.0之间 ,缓冲溶液用量为 2 ml,显色液体积为 3ml。氯浓度在 0 .1～2 .0 mg/L范围服从比尔定律。检测限 c L D为 0 .0 2 mg/L,水中常见的离子不干扰测定。该法用于自来水等样品中余氯含量的测定 ,加标回收率在 98%～ 1 0 4 %之间 ,结果准确可靠。
New method has been developed for determination of the residual chlorine in water supply by p-aminodimethyl aniline spectrophotometry. On some conditions, chlorine can oxidatep-aminodimethyl aniline,and make it become red oxidation state,and this method can quantifi-cationally determine chlorine,the experiment conditions as follows: the most absorption wavelengh is 520 nm,pH should be controlled between 2.5 and 4.0,the dosage of amortize liquid is 2 ml,the volume of showing color liquid is 3 ml.Beer's law is obeyed in the range of 0.1～2.0 mg/L of chlorine;the detection limit of chlorine is 0.02 mg/L.The method has been applied to determine of residual chlorine in some water samples with satisfactory results.
