粉煤灰中氨氮的测定方法研究  

Study on determination method for ammonia nitrogen in fly ash

作　　者：黄华伟 吴敏[1,2] 黄茁[1,2] HUANG Huawei;WU Min;HUANG Zhuo(Basin Water Environment Research Department,Yangtze River Scientific Research Institute,Wuhan 430010,China;Key Laboratory of Basins Water Resources and Eco-Environmental Science in Hubei Province,Yangtze River Scientific Research Institute,Wuhan 430010,China)

机构地区：[1]长江科学院流域水环境研究所,湖北武汉430010 [2]长江科学院流域水资源与生态环境科学湖北省重点实验室,湖北武汉430010

出　　处：《化工环保》2019年第6期702-706,共5页Environmental Protection of Chemical Industry

基　　金：中央级公益性科研院所基本科研业务费项目(CKSF2017062/SH)

摘　　要：从浸提、干扰去除和显色3个方面对纳氏试剂分光光度法进行优化改进,建立了一种用于粉煤灰中氨氮测定的适宜方法,并利用浸提完全度和精密度实验对该方法了进行了评价。优化后的方法为:按固液比1∶10加入0.05 mol/L H2SO4振荡浸提30 min,再加入1.5 mL酒石酸钾钠溶液(500 g/L)和1.5 mL NaOH溶液(5 mol/L)去除金属离子干扰,最后加入1.5 mL纳氏试剂进行显色。粉煤灰浸提后残渣的蒸馏液中未检测出氨氮,说明浸提效果较为完全。同一样品的8次平行测定结果的相对标准偏差为6.10%,说明该方法稳定可靠。The Nessler’s reagent spectrophotometry was optimized and improved from 3 aspects of extraction,interference elimination and color reaction,and a suitable method for determination of ammonia in fly ash was established.The method was evaluated by extraction completeness and precision experiments.The optimized method is as follows:adding 0.05 mol/L H2SO4 with solid-liquid ratio of 1∶10,extracting 30 min,then adding 1.5 mL potassium sodium tartrate solution(500 g/L)and 1.5 mL NaOH solution(5 mol/L)to eliminate the interference of metal ions,at last,adding 1.5 mL Nessler’s reagent for color reaction.The ammonia-nitrogen is not detected in the distillation liquid of the fly ash extraction residue,which indicates the completely leaching.The relative standard deviation of 8 parallel determinations results is 6.10%,indicating that the method is stable and reliable.

关 键 词：粉煤灰 氨氮 浸提 去干扰 显色 测定方法 

分 类 号：X705[环境科学与工程—环境工程]