DENUDER TUBE PRECONCENTRATION AND DETECTION OF GASEOUS AMMONIA USING A COATED QUARTZ PIEZOELECTRIC CRYSTAL

被引:14
作者
ALI, ZF
THOMAS, CLP
ALDER, JF
MARSHALL, GB
机构
[1] UNIV MANCHESTER, INST SCI & TECHNOL, DEPT INSTRUMENTAT & ANALYT SCI, POB 88, MANCHESTER M60 1QD, LANCS, ENGLAND
[2] NATL POWER TECHNOL & ENVIRONM CTR, LEATHERHEAD KT22 7SE, SURREY, ENGLAND
关键词
AMMONIA; PIEZOELECTRIC CRYSTAL; DENUDER TUBE; PRECONCENTRATION;
D O I
10.1039/an9921700899
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The feasibility of using a cylindrical denuder tube for sampling gaseous ammonia, followed by detection with a piezoelectric quartz crystal, was investigated. Gaseous ammonia was sampled with a tungsten oxide-coated cylindrical denuder tube and then thermally desorbed onto a piezoelectric quartz crystal coated with pyridoxine hydrochloride-Antarox CO-880. A linear calibration graph of peak area response versus ammonia concentration sampled was obtained for ammonia concentrations between 3.1 and 8.2-mu-g l-1. A concentration of 29 ng l-1 of ammonia in air was detected with a signal-to-background ratio of 14:1 by achieving an enrichment ratio of 900 with the tungsten oxide denuder tube.
引用
收藏
页码:899 / 903
页数:5
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