AMMONIA-GAS-SELECTIVE OPTICAL SENSORS BASED ON NEUTRAL IONOPHORES

被引：67

作者：

OZAWA, S ^{[1
]}

HAUSER, PC ^{[1
]}

SEILER, K ^{[1
]}

TAN, SSS ^{[1
]}

MORF, WE ^{[1
]}

SIMON, W ^{[1
]}

机构：

[1] SWISS FED INST TECHNOL, SWISS FED INST TECHNOL, DEPT ORGAN CHEM, UNIV STR 16, CH-8092 ZURICH, SWITZERLAND

来源：

ANALYTICAL CHEMISTRY | 1991年 / 63卷 / 06期

关键词：

D O I：

10.1021/ac00006a017

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

An optical sensor (optode) that responds selectively to ammonia gas in solution samples has been realized by combining a gas-permeable membrane with a plasticized poly(vinyl chloride) (PVC) membrane, the latter incorporating a cation-selective neutral ionophore, a H+-selective neutral chromoionophore that changes its absorption spectrum upon protonation, and a lipophilic anionic site. The optodes based on NH4+-selective neutral ionophores of the macrotetrolide type showed a high selectivity for ammonia over other ammonia derivatives (e.g., log K(NH3,CH3NH2)opt = -2.7). The reproducibilities between 10(-4) and 10(-3) M ammonia samples were 4.5% and 2.6%, respectively. Optodes based on valinomycin showed moderate ammonia selectivity (log K(NH3,CH3NH2)opt = -0.4), but the dynamic linear range was shifted to higher concentrations of ammonia so that the reproducibilities between 10(-4) and 10(-3) M ammonia samples could be improved (3.2% and 1.6%, respectively).

引用

页码：640 / 644

页数：5

共 20 条

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