某工业废水氨氮含量测定影响因素的分析

摘要

There are many interference factors in the process of ammonia nitrogen determination,which will affect the accuracy of the results.Nessler's reagent colorimetric method has been adopted to determinate the ammonia nitrogen content in waste water,and the conditions such as water storage time,sample pretreatment method,pH value,reaction temperature,coloration time and so on were analyzed.Test results show thatit's necessary to deal with the waste water on time.After pretreatment by distillation,good accuracy and repeatability of ammonia nitrogen determination can be obtained under the optimum conditions of the pH value is 9-9.5,the reaction temperature is 20 ℃,and the color reaction time is 15 min.%在测定工业废水中氨氮含量的过程中,有很多干扰因素影响测定结果的准确性.采用纳氏试剂比色法测定废水中氨氮含量,并对水样存放时间、样品预处理方法、水样 pH 值、反应温度及显色时间等因素进行了分析.结果表明,采取的废水应及时进行分析测定,首先采用蒸馏法对废水进行预处理,在水样 pH值为9~9.5、反应温度为20 ℃、显色反应时间为15 min的最佳条件下,氨氮测定结果的准确性和重复性好且误差小.