工作场所空气中氨的纳氏试剂分光光度法样品保存时间改进  

Improvement of Sample Retention Time for Nessler's Reagent Spectrophotometric Method for Ammonia in Workplace Air

作　　者：赵朝廷 何迎春 宋亚玲 秦天 化跃 Zhao Chaoting;He Yingchun;Song Yaling;Qin Tian;Hua Yue(Chongqing Huineng Biaopu Technology Co.,Ltd.,Chongqing 401121,China)

机构地区：[1]重庆惠能标普科技有限公司,重庆401121

出　　处：《山西化工》2024年第11期118-120,共3页Shanxi Chemical Industry

摘　　要：《工作场所空气有毒物质测定无机含氮化合物》为标准测定氨的方法改进,以0.005 mol/L的硫酸作为吸收液,研究氨的保存时间优化,以纳氏试剂作为显色剂,在420 nm波长下测定吸光度,根据《职业卫生标准制定指南第4部分:工作场所空气中化学物质测定方法》(GBZ/T 210.4—2008)样品准确度和稳定性试验规定,研究保存时间对其结果的影响。经试验证明,工作场所空气中氨以0.005 mol/L硫酸溶液作为吸收液,用大型气泡吸收管采集,在碱性溶液中,氨与纳氏试剂反应生成黄色络合物,在420 nm波长下测定吸光度,采集样品的保存时间至少可延长至7 d。The method for determining ammonia based on the standard Determination of Inorganic Nitrogen Compounds in Workplace Air Toxic Substances was improved.0.005 mol/L sulfuric acid was used as the absorption solution to study the optimization of ammonia storage time.Nessler's reagent was used as the color reagent to measure absorbance at a wavelength of 420 nm.According to the Guidelines for the Development of Occupational Health Standards Part 4:Methods for the Determination of Chemical Substances in Workplace Air(GBZ/T210.4-2008) sample accuracy and stability test regulations,the influence of storage time on its results was studied.Through experiments,it has been proven that ammonia in the workplace air is absorbed by a 0.005 mol/L sulfuric acid solution,collected using a large bubble absorption tube.In an alkaline solution,ammonia reacts with Nessler's reagent to form a yellow complex,and the absorbance is measured at a wavelength of 420 nm.The storage time of the collected samples can be extended to at least 7 days.

关 键 词：氨 纳氏试剂 保存时间优化 

分 类 号：X51[环境科学与工程—环境工程]