预蒸馏-纳氏试剂分光光度法测定水样中氨氮的优化  

The Optimization of Determination of Amonia Nitrogen in Water by Predistillation-nessler’s Reagent Spectrophotometer

作　　者：陈志强 CHEN Zhi-qiang(Fushun Eco-environmental Monitoring Center of Liaoning Province,Fushun 113006,China)

机构地区：[1]辽宁省抚顺生态环境监测中心,辽宁抚顺113006

出　　处：《化工管理》2020年第10期55-56,65,共3页Chemical Engineering Management

摘　　要：由于硼酸吸收液的影响,按照国家标准HJ 535-2009,使用预蒸馏法对水样进行前处理时,氨氮实测结果偏低。用无氨水代替硼酸作为吸收液,从而消除硼酸对氨氮测定的影响。探讨了无氨水作为吸收液时的吸收效率;对预蒸馏水样的保存时间进行了实验研究。实验结果表明,使用无氨水作为吸收液,具有很好的准确度和精密度,并且简化了实验操作过程。According to national standard (HJ 535-2009),predistillation was used in the pretreatment of water.Because of the effect of boric acid absorption liquid,the determining result of amonia nitrogen was low.When non-ammonia water was used as absorption liquid,the effect was eliminated.The absorption efficiency of non-ammonia water was discussed.The preservative time of pre-distilled water sample was researched.The results show that the method has good precision and accuracy,and simple operation.

关 键 词：纳氏试剂分光光度法 预蒸馏 无氨水 吸收液 

分 类 号：X832[环境科学与工程—环境工程] O657.3[理学—分析化学]