摘要
基于在酸性介质中NO-2与H2O2反应生成不稳定的过氧亚硝酸,在碱性环境中猝灭为过氧亚硝酸根离子产生化学发光的原理,改变通常的顺序注射进样方式,将储存管和反应管合并,以三乙醇胺为吸收液,采用液相化学发光方法,检测了大气中痕量的氮氧化物。工作曲线线性范围为1×10-7~1×10-4mol/L,方法的检出限为1×10-7mol/L。对浓度为5×10-5mol/L的试液重复测量11次的相对标准偏差为2 7%。样品回收率在85%~104%之间,分析频率为80样/h。
Nitride reacts with hydrogen peroxide to form peroxynitrous acid in sulfuric acid medium, which is an unstable state in acid medium and subsequently was quenched into peroxynitrite in basic solution. Based on this, a sequential injection chemiluminescence method for the determination of trace amounts of nitrogen oxide in air was established. During the composition of peroxynitrite the chemiluminescence intensity was enhanced with the presence of uranin and cetyl trimethyl ammonium bromide (CTMAB). The product from the reaction between nitrogen dioxide and triethanolamine was used as an absorbing solution for NO2 in the conversion of NO2 to nitrite. The reaction coil (flow cell) and holding coil were combined as a new sampling means. The detection limit of NO2 is 1 × 10-7 mol/L for 50 μL sample and the sampling frequency is 80 samples per hour. The linear range of the calibration curve is from 1 × 10-7 to1 × 10-4 mol/L. The relative standard deviation for 1 × 10-5 mol/L NO2 is 2.7% with the recovery of 85% - 104%.
出处
《冶金分析》
EI
CAS
CSCD
北大核心
2005年第2期1-5,共5页
Metallurgical Analysis
基金
国家自然科学基金资助项目(20077028)