电厂水汽中微量氨含量测定方法研究  

Detection methods for trace ammonia in water vapor system of power plants

作　　者：星成霞[1] 李永立[1] 王应高[1] 翟雅[2] 

机构地区：[1]华北电力科学研究院有限责任公司,北京100045 [2]华北电力大学环境工程学院,河北保定071002

出　　处：《热力发电》2013年第7期135-137,141,共4页Thermal Power Generation

摘　　要：采用氨气敏电极法、铵离子选择性电极法和纳氏试剂光度法对电厂水汽中的微量氨含量进行了对比测定,考察电极法测量的准确度与精密度,以及联氨对氨气敏电极法测量准确性的影响。结果表明:标准水样中氨含量在0～3.0mg/L范围内,2种电极法测定的相对标准偏差均小于0.5%,测量电厂实际水样与纳氏试剂光度法的偏差均为±0.05mg/L,说明2种电极法测定水汽中氨含量具有较高的精度及准确度;水汽中微量的联氨不会对氨气敏电极电位法的测量准确性产生影响;氨气敏电极法操作简单、干扰因素少、准确度高,可推广应用于电厂日常水汽监督工作中。Accurate detection of trace ammonia in water vapor system of power plants plays an important role in optimization operation of water treatment system and condensate water polishing system.The ammonia electrode method,ammonium ion selective electrode method and Nessler's reagent spectrophotometry method were adopted to determine the ammonia concentration in water vapor system,and the results were compared.The accuracy and precision of the electrode methods were investigated.Moreover,effect of hydrazine on determination results by ammonia electrode method was also observed.The results showed that,when the ammonia concentration in standard water sample was within the range of 0.0mg/L to 3.0mg/L,the relative standard deviations(RSD)of two electrode methods were both lower than 0.5%,and the RSDs of above three methods for ammonia content detection in actual water from power plants were all within ±0.05mg/L.This indicated that the two electrode methods had higher accuracy and precision,hydrazine in water samples had no influence on the ammonia electrode determination,and the ammonia electrode method had the advantages of simple operation,less interference factors and high accuracy,it can be applied to daily water vapor quality supervisory control in power plants.

关 键 词：氨气敏电极法 铵离子选择性电极法 纳氏试剂光度法 电厂水汽 氨 联氨 

分 类 号：O657.15[理学—分析化学] TM621.8[理学—化学]