Determination of Nitrophenol Pesticides in Mineral Water and Tap Water by HPLC with Ultraviolet and Amperometric Detection

Kadota, Minoru; Imanaka, Masaaki; Ikegawa, Kiyoshi; Kumashiro, Kazuo; Mori, Tadashige; Suzuki, Sukeji; Nakazawa, Hiroyuki

doi:10.3358/shokueishi.37.48

Cited by 3 publications

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“…Conventional methods for the assay of nitrophenols are discontinuous, usually involving classical chemical methods, 1 UV-visible spectrophotometry 2 or polarogaphy 3 after the analytes have beeen reduced and transformed into azo compounds. Methods based on the use of gas chromatography 4 and HPLC [5][6][7] have been developed for the direct determination of nitrophenols, but questions remain about how to realize online destructive devices. Potentiometry with ion-selective electrodes 8,9 for picric acid (2,4,6-trinitrophenol) has been applied and shows considerbale advantages over other methods in the area of pharmaceutical analysis 10 and biological chemical determination.…”

Section: Introductionmentioning

confidence: 99%

A selective PVC membrane for di- or trinitrophenol based on N,N-dibenzyl-3,3′,5,5′-tetramethylbenzidine

Yang

Wang

Long

et al. 2001

Analyst

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A new fluorophore, N,N-dibenzyl-3,3',5,5'-tetramethylbenzidine (NBTMB), was prepared and shown to exhibit significant and analytical usefulness for optical sensing toward 2,4-dinitrophenol or 2,4,6-trinitrophenol (picric acid) when it was immobilized in a plasticized poly(vinyl chloride) (PVC) membrane. When the membrane was applied to aqueous nitrophenol solution, NBTMB was able to extract selectively nitrophenol into the membrane phase. Since the extraction equilibrium was accompanied by fluorescence quenching of NBTMB, the chemical recognition process could be directly translated into an optical signal. The sensor showed reversible response in the concentration range from 2.0 x 10(-7) to 6.0 x 10(-5) mol L(-1) for the detection of 2,4-dinitrophenol in NaOAc-HOAc buffer at pH 4.0. It also showed a fast response time (t95% < 1.5 min) when the sensor was applied to 2,4-dinitrophenol solution at concentration levels of 5.26 x 10(-6) and 2.10 x 10(-5) mol L(-1) alternatively. A working principle is proposed and the responses of this sensor to various kinds of nitrophenol were studied. The sensor was applied to the direct determination of 2,4-dinitrophenol in prepared water samples and the indirect assay of the drug cinchonine and the results obtained were satisfactory.

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