Square-wave voltametric method for determination of molinate concentration in a biological process using a hanging mercury drop electrode

• Type: Article in International Scientific Journal
• Date: 2005

Authors

Barroso, MF (Author) Other; Nunes, OC (Author) FEUP; Vaz, MC (Author) Other; Delerue Matos, C (Author) Other

Journal

Title: Analytical and Bioanalytical Chemistry

Vol. 381 No. 4

Pages: 879-883

ISSN: 1618-2642

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 9 Citations

ISI Web of Science

Scopus - 10 Citations

COMPENDEX

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-000-4RZ

DOI: 10.1007/s00216-004-2971-9

Abstract (EN): A square-wave voltammetric (SWV) method using a hanging mercury drop electrode (HMDE) has been developed for determination of the herbicide molinate in a biodegradation process. The method is based on controlled adsorptive accumulation of molinate for 10 s at a potential of -0.8 V versus AgCl/Ag. An anodic peak, due to oxidation of the adsorbed pesticide, was observed in the cyclic voltammogram at ca. -0.320 V versus AgCl/Ag; a very small cathodic peak was also detected. The SWV calibration plot was established to be linear in the range 5.0 x 10(-6) to 9.0 x 10(-6) mol L-1; this corresponded to a detection limit of 3.5 x 10(-8) mol L-1. This electroanalytical method was used to monitor the decrease of molinate concentration in river waters along a biodegradation process using a bacterial mixed culture. The results achieved with this voltammetric method were compared with those obtained by use of a chromatographic method (HPLC-UV) and no significant statistical differences were observed.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5