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FLOW-INJECTION ANALYSIS USING PH PF ISFET COMBINATIONS FOR DETERMINATION OF VERY-LOW FLUORIDE CONCENTRATIONS

被引：9
作者：
MORITZ, W
LISDAT, F
VANDERSCHOOT, BH
DEROOIJ, NF
VANDENVLEKKERT, HH
LIGTENBERG, HCG
GROHMANN, I
机构：
[1] UNIV NEUCHATEL,INST MICROTECHNOL,CH-2000 NEUCHATEL,SWITZERLAND
[2] SENTRON,9300 AC RODEN,NETHERLANDS
[3] KAI EV,WISSENSCH LERINTEGRATIONSPROG,O-1199 BERLIN,GERMANY
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 1993年 / 15卷 / 1-3期
关键词：
D O I：
10.1016/0925-4005(93)85056-G
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A flow injection analysis system has been developed using a fluoride ISFET as detector and a pH ISFET as reference. We found that the application of acid solutions decreases the response time of the fluoride sensor. Optimum conditions are in a range around pH 2, which can be met using 1 mol dm-3 acetic acid. The sample rate can be increased by a factor of 8 in this solution compared to standard TISAB and very low concentrations down to 1 ppb can be determiend. The reason for the influence of pH oh the response rate has been investigated using impedance spectroscopy and XPS showing that chemical modification of the LaF3 surface reduces the energy barrier for fluoride ion transfer.
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收藏
页码：223 / 227
页数：5
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