摘要
利用纳氏试剂与氨气显色的原理,研制了一种简易、快速测定室内空气中微量氨气的方法,对不同实验条件进行了对比选择,筛选出了最佳实验条件为:玻璃管内径2.2mm,吸附载体为80～100目的活化硅胶与酒石酸氢钾的混合物(物质的量比为3∶1),采气速度0.02L/min,采样时间10min,采样量0.2L,显色时间3min.实验结果表明,检测管显色强度与氨气浓度呈线性关系,最低显色浓度为0.2mg/m3;在最低显色浓度下,5次测定值的变异系数为12.8%,小于15%,平均相对误差为8.8%,小于15%,一次测定最大相对误差为19.5%,小于25%,测定符合GB7230-87的要求.有机胺、H2S气体、HCHO产生干扰.检测管的使用寿命为6个月.
A method for rapidly and simply determining trace ammonia indoor air was developed by using color development reaction of Nessler reagent with ammonia. The optimizing conditions of test tube were obtained, which were that inner diameter of glass tube was 2.2 mm, absorbent carrier was admixture of active silica gel of 80~100 mesh and tartarus(molar ratio 3∶1); the sampling volume was 0.2 L at a speed of 0.02 L/min; color development time was 3 min. The experimental results showed that the color intensity of test tubes had linear relation with concentration of ammonia gas; the lowest concentration is 0.2 mg/m^3; variation coefficient for five times is 12.8% with the lowest concentration(<15%);the saverage relative error is 8.8%(<15%);the maximum relative error is 19.5%(<25%). All of these were in range of GB 7230-87. Organic amine, H_2S and HCHO had disturbance. The service life of the test tube was 6 mouths.
出处
《天津师范大学学报（自然科学版）》
CAS
2004年第3期15-17,共3页
Journal of Tianjin Normal University：Natural Science Edition
基金
国家科技部"十五"科技攻关项目(2001BA210A06)
关键词
氨气
检测管
快速检测
空气
ammonia
test tube
rapid determination
air
