Determination of tetramethylthiuram disulfide (thiram) for residual analysis in food using spectrophotometry coupled with a solid-phase reactor (SPR) in a flow system

An analytical method was developed for quantification of the fungicide thiram (tetramethylthiuram disulfide), based on its capacity to complex Cu 2+ ions. A solid-phase reactor (SPR) was coupled in a flow system containing a spectrophotometer as detector. The SPR consisted of a tube filled with fine...

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Bibliographic Details
Published in:International journal of environmental analytical chemistry 2014-01, Vol.94 (9), p.874-883
Main Authors: Silva Junior, Ranulfo C., Kushikawa, Ricardo T., Gomes, Homero M., Teixeira, Marcos F. S.
Format: Article
Language:English
Subjects:
Copper
flow injection analysis
Food
Ions
Pesticides
Reactors
solid-phase reactor
spectrophotometry
thiram
thiuram disulfide
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Summary:An analytical method was developed for quantification of the fungicide thiram (tetramethylthiuram disulfide), based on its capacity to complex Cu 2+ ions. A solid-phase reactor (SPR) was coupled in a flow system containing a spectrophotometer as detector. The SPR consisted of a tube filled with finely ground resin, in which copper(II) phosphate was immobilised prior to polymerisation. Contact of thiram with the Cu 2+ ions immobilised in the resin resulted in the formation of a strongly coloured Cu 2+ /thiram complex. Maximum absorbance of the Cu 2+ /thiram complex was obtained at a wavelength of 439 nm. The usefulness of the methodology has been evidenced by the determination of thiram residues in corn and bean grains. Previously, a variety of transition metal cations which would form coloured complexes with tetramethylthiuram disulfide were tested.
ISSN:0306-7319
1029-0397
DOI:10.1080/03067319.2014.914183