水样预处理的pH控制对氨氮测定的影响  

INFLUENCE OF pH OF PRETREATED WATER SAMPLE ON THE DETERMINATION OF AMMONIA NITROGEN

作　　者：魏小玲[1] 黄伟[1] 张绚璇[1] 

机构地区：[1]山东科技大学化学与环境工程学院,山东青岛266510

出　　处：《环境工程》2009年第S1期581-583,共3页Environmental Engineering

摘　　要：国标(GB7479-87和GB7471-87)中纳氏试剂比色法测定水中氨氮含量需要对水样做预处理。对于污染严重的工业废水和生活污水采用蒸馏法进行预处理,较清洁的水样多采用絮凝沉淀法。通过实验对预处理过程中的pH条件进行分析,探讨氨氮测定过程中水样预处理的pH控制对比色分析的影响,进而优化pH控制,使之便于操作。实验结果显示预处理水样的pH对比色测定结果影响较大,蒸馏法和絮凝法预处理水样的pH在9～11范围时,均能获得较高回收率。The water sample should be pretreated when detect the NH_3-Nitrogen in the water by Nash reagent colorimetry in National standard(GB7479-8 and GB7471-87).As for heavily polluted industrial water and living wastewater,the distillation is used to preprocess the water sample,and flocculation and sedimentation are used to preprocess the relative clear water.This text analyses the condition of pH during the pretreatment by experiment,and discusses the influence of the pH on the determination of the results,so to choose the best condition,and make it more convenient for operation.The result of experiments shows that pH of pretreated water sample affects the result a lot.When adjusting the pH between 9～11,the method can get high recovery.

关 键 词：纳氏试剂比色法 氨氮测定 水样预处理 碱度控制 

分 类 号：X832[环境科学与工程—环境工程]