SPECTROPHOTOMETRIC DETERMINATION OF TRACE LEVELS OF ATMOSPHERIC AMMONIA BY CONVERSION INTO INDOPHENOL AND EXTRACTION WITH QUATERNARY AMMONIUM-SALTS

被引：3
|
作者：
YAMAMOTO, N
KASAHARA, N
SHIRAI, T
机构：
[1] Department of Applied Chemistry, Faculty of Science and Technology, Keio University, Hiyoshi, Yokohama
来源：
TALANTA | 1990年 / 37卷 / 11期
关键词：
D O I：
10.1016/0039-9140(90)80154-8
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Indophenol, produced in proportion to the amount of ammonia present, can be quantitatively extracted into chloroform as an ion-pair with tetradodecylammonium (TDA+) bromide and determined by spectrophotometry. The molar absorptivity of the indophenol-TDA+ complex is 2.5 × 104 1.mole-1.cm-1 (maximum absorption at 653 nm), which is 25% greater than that for the indophenol-TDA+ complex in aqueous medium. This procedure is applicable to determination of μl/m3 levels of atmospheric ammonia, with 1-hr sampling periods. © 1990.
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页码：1063 / 1065
页数：3
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