Issue 5, 2000

A renewable liquid drop sensor for di- or trinitrophenol based on fluorescence quenching of 3,3′,5,5′-tetramethylbenzidine dihydrochloride

Abstract

A novel renewable liquid drop sensor is proposed for the execution of a sensitive, simple and rapid assay. The dynamically growing and falling drops are formed at the bottom tip of a silanized silica capillary tube connected to the end of a flow system. The feasibility of the proposed method was demonstrated by performing the fluorimetric determination of di- or trinitrophenol by using 3,3′,5,5′-tetramethylbenzidine dihydrochloride (TMB-d) as sensing reagent. The optimum analytical conditions were established. The sensor shows linear responses in the measuring ranges from 2.45 × 10−7 to 5.0 × 10−5 mol l−1 2,4-dinitrophenol and from 1.07 × 10−7 to 8.0 × 10−6 mol l−1 2,4,6-trinitrophenol, and has detection limits of 1.0 × 10−8 mol l−1 for 2,4-dinitrophenol and 4.0 × 10−9 mol l−1 for 2,4,6-trinitrophenol. The analysis is simple and rapid and consumes only micro-amounts of reagent and sample. The sensor was applied to the direct determination of 2,4-dinitrophenol in synthetic water samples and the indirect assay of quinine through quantitative precipitation with 2,4,6-trinitrophenol. The results were in good agreement with those obtained by another method.

Article information

Article type
Paper
Submitted
16 Dec 1999
Accepted
29 Feb 2000
First published
03 Apr 2000

Analyst, 2000,125, 877-882

A renewable liquid drop sensor for di- or trinitrophenol based on fluorescence quenching of 3,3′,5,5′-tetramethylbenzidine dihydrochloride

R. Yang, K. Wang, D. Xiao, K. Luo and X. Yang, Analyst, 2000, 125, 877 DOI: 10.1039/A909883F

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