Electrochemical sensor for simultaneous determination of herbicide MCPA and its metabolite 4-chloro-2-methylphenol. Application to photodegradation environmental monitoring

• Type: Article in International Scientific Journal
• Date: 2015

Authors

Rahemi, V (Author) Other; Garrido, JMPJ (Author) Other; Borges, F (Author) FCUP; Brett, CMA (Author) Other; Garrido, EMPJ (Author) Other

Journal

Title: Environmental Science and Pollution Research

Vol. 22

ISSN: 0944-1344

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 16 Citations

Scopus - 17 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

CORDIS: Physical sciences > Chemistry > Applied chemistry

Other information

Authenticus ID: P-00A-7CC

Abstract (EN): The development and application of a polyaniline/carbon nanotube (CNT) cyclodextrin matrix (PANI-beta-CD/MWCNT)-based electrochemical sensor for the quantitative determination of the herbicide 4-chloro-2-methylphenoxyacetic acid (MCPA) and its main transformation product 4-chloro-2-methylphenol in natural waters are described. A simple cyclic voltammetry-based electrochemical methodology, in phosphate buffer solution at pH 6.0, was used to develop a method to determine both MCPA and 4-chloro-2-methylphenol, without any previous extraction or derivatization steps. A linear concentration range (10 to 50 mu mol L-1) and detection limits of 1.1 and 1.9 mu mol L-1, respectively, were achieved using optimized cyclic voltammetric parameters. The proposed method was successfully applied to the determination of MCPA and 4-chloro-2-methylphenol in natural water samples with satisfactory recoveries (94 to 107 %) and in good agreement with the results obtained by an established high-performance liquid chromatography technique, no significant differences being found between the methods. Interferences from ionic species and other herbicides used for broad-leaf weed control were shown to be small. The newly developed methodology was also successfully applied to MCPA photodegradation environmental studies.

Language: English

Type (Professor's evaluation): Scientific