Research article summary (published 8 Jun 2009):

Organically nanoporous silica gel based on carbon paste electrode for potentiometric detection of trace Cr(III).

Full Abstract

A new ion-selective electrode (ISE) for the detection of trace chromium(III) was designed by using 2-acetylpyridine and nanoporous silica gel (APNSG)-functionalized carbon paste electrode (CPE). The presence of APNSG acted as not only a paste binder, but also a reactive material. With 7.5 wt% APNSG proportions, the developed electrode exhibited wide dynamic range of 1.0 x 10(-8) to 1.0 x 10(-3) M toward Cr(III) with a detection limit of 8.0 x 10(-9) M and a Nernstian slope of 19.8 +/- 0.2 mV decade(-1). The as-prepared electrode displayed rapid response (approximately 55 s), long-time stability, and high sensitivity. Moreover, the potentiometric responses could be carried out with wide pH range of 1.5-5.0. In addition, the content of Cr(III) in food samples, e.g. coffee and tea leaves, has been assayed by the developed electrode, atomic absorption spectrophotometer (AAS) and atomic emission spectrometer (ICP-AES), respectively, and consistent results were obtained. Importantly, the response mechanism of the proposed electrode was investigated by using AC impedance and UV-vis spectroscopy.

Author information

Author/s: Zhou, Wei (W); Chai, Yaqin (Y); Yuan, Ruo (R); Guo, Junxiang (J); Wu, Xia (X);

Affiliation: Key Laboratory on Luminescence and Real-Time Analysis, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China.

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't; Validation Studies

Journal: Analytica chimica acta (Anal Chim Acta), published in Netherlands. (Language: eng)

Reference: 2009-Aug; vol 647 (issue 2) : pp 210-4

Dates: Created 2009/07/13; Completed 2009/10/26;

PMID: 19591707, status: MEDLINE (last retrieval date: 10/26/2009, IMS Date: )

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Carbon - chemistry Chromium - analysis Coffee - chemistry Electric Impedance Electrodes Gels - chemistry Hydrogen-Ion Concentration Ions - chemistry

Ions - chemistry Plant Leaves - chemistry Potentiometry - methods Pyridines - chemistry Sensitivity and Specificity Silicon Dioxide - chemistry Spectrophotometry, Ultraviolet Tea - chemistry

Associated Chemicals: 2-acetylpyridine (0) ; Coffee (0) ; Gels (0) ; Ions (0) ; Pyridines (0) ; Tea (0) ; Carbon (7440-44-0) ; Chromium (7440-47-3) ; Silicon Dioxide (7631-86-9)

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