共 2 条
[1]
ROSS JW, 1969, Patent No. 3483112
[2]
TAN SSS, 1989, CHIMIA, V43, P257
AN OPTICAL SENSOR FOR THE DETECTION OF NITRATE
被引：18
作者：
LUMPP, R
REICHERT, J
ACHE, HJ
机构：
[1] Kernforschungszentrum Karlsruhe GmbH, Institut für Radiochemie, W-7500 Karlsruhe
关键词：
2;
D O I：
10.1016/0925-4005(92)80346-Y
中图分类号：
O65 [分析化学];
学科分类号：
070302 ;
081704 ;
摘要：
An optical chemical sensor for the selective detection of nitrate ions has been developed. The sensitive layer consists of a poly(vinylchloride) membrane containing a nitrate-selective ionophore and a proton-selective (chromo)-ionophore (i.e., a pH indicator). Transport of nitrate ions into the membrane leads to a coextraction of protons, which can be followed by an absorption change of the indicator. The sensor is reversible, showing linear response from 3 x 10(-4) to 4 x 10(-3) mol/l (20-250 mg/l) with a detection limit of 2 x 10(-5) mol/l (1.2 mg/l) nitrate. The response time is of the order of some minutes, and a long-term stability of about five days is observed.
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页码：473 / 475
页数：3
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