SciELO - Scientific Electronic Library Online

 
vol.20 issue5Copper catalyzed cross-coupling reactions of diaryl ditellurides with potassium aryltrifluoroborate saltsMicrowave-assisted reaction of 2,3-dichloronaphthoquinone with aminopyridines author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Journal of the Brazilian Chemical Society

Print version ISSN 0103-5053

Abstract

KAUR, Manpreet et al. Development of a derivative spectrophotometric method for the determination of fungicide zinc ethylenebisdithiocarbamate using sodium molybdate. J. Braz. Chem. Soc. [online]. 2009, vol.20, n.5, pp. 993-998. ISSN 0103-5053.  http://dx.doi.org/10.1590/S0103-50532009000500026.

A derivative spectrophotometric procedure was developed for the determination of zinc(II) ethylenebisdithiocarbamate, Zineb, after formation of its blue colored complex with sodium molybdate in acidic medium. The Beer's law is obeyed up to 40 µg mL-1of Zineb at 956 nm. The detection limit was 0.006 µg mL-1 for Zineb when S/N ratio is 3 taking into account various parameters, such as the effect of acid concentration. The interference of a large number of ions on the determination of Zineb was evaluated. Most of the alkaline metals and metal salts did not interfere. The procedure presented proper sensitivity and it was applied for determining Zineb in food stuffs and commercial samples of Dithane Z 78 and Hexathane 75% W.P.. Results were compared with earlier reported methods. Zineb was successfully determined without any interferences in the presence of other dithiocarbamates like ziram, thiram, ferbam etc.

Keywords : derivative spectrophotometry; Zineb; sodium molybdate; commercial samples.

        · abstract in Portuguese     · text in English     · pdf in English