AN OPTICAL WAVE-GUIDE ACID VAPOR SENSOR

被引：18

作者：

BALLANTINE, DS ^{[1
]}

CALLAHAN, D ^{[1
]}

MACLAY, GJ ^{[1
]}

STETTER, JR ^{[1
]}

机构：

[1] TRANSDUCER RES INC, NAPERVILLE, IL 60540 USA

来源：

TALANTA | 1992年 / 39卷 / 12期

关键词：

D O I：

10.1016/0039-9140(92)80200-W

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

An optical waveguide sensor for the detection of acid vapors is described. The chemically sensitive reagent coating consists of bromothymol blue indicator suspended in a Nafion polymer film. The sensor uses a 562 nm LED source and a phototransistor detector. Response to hydrochloric acid and hydrogen sulphide vapors is both rapid and reversible, with an estimated detection limit for hydrogen sulphide of less than 15 ppm. The sensor exhibits generalized response to protonic acid vapors, but does not produce an indicator response to carbon dioxide, even at large concentrations (1100 mg/l.) in the presence of water vapor. The sensor exhibits a systematic interference from water vapor which may be corrected by a differential approach, either using a reference sensor (Nafion/no indicator) or by monitoring sensor response at two wavelengths.

引用

页码：1657 / 1667

页数：11

共 22 条

[1] SURFACE ACOUSTIC-WAVE DEVICES FOR CHEMICAL-ANALYSIS [J].