TITLE

Catalytic adsorptive stripping voltammetric determination of copper(II) on a carbon paste electrode

AUTHOR(S)
Ning Liu; Jun-Feng Song
PUB. DATE
September 2005
SOURCE
Analytical & Bioanalytical Chemistry;Sep2005, Vol. 383 Issue 2, p358
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A catalytic adsorptive stripping voltammetric method for the determination of copper(II) on a carbon paste electrode (PCE) in an alizarin red S (ARS)-K2S2O8 system is proposed. In this method, copper(II) is effectively enriched by both the formation and adsorption of a copper(II)-ARS complex on the PCE, and is determined by catalytic stripping voltammetry. The catalytic enhancement of the cathodic stripping current of the Cu(II) in the complex results from a redox cycle consisting of electrochemical reduction of Cu(II) ion in the complex and subsequent chemical oxidation of the Cu(II) reduction product by persulfate, which reduces the contamination of the working electrode from Cu deposition and also improves analytical sensitivity. In Britton-Robinson buffer (pH 4.56±0.1) containing 3.6×10−5 mol L−1 ARS and 1.6×10−3 mol L−1 K2S2O8, with 180 s of accumulation at −0.2 V, the second-order derivative peak current of the catalytic stripping wave was proportional to the copper(II) concentration in the range of 8.0×10−10 to ∼3.0×10−8 mol L−1. The detection limit was 1.6×10−10 mol L−1. The proposed method was evaluated by analyzing copper in water and soil.
ACCESSION #
18527387

 

Related Articles

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics