Improvement in the Determination of Mancozeb Residues by the Carbon Disulfide Evolution Method Using Flow Injection Analysis

The sample decomposition of the carbon disulfide evolution method for the determination of dithiocarbamate residues was carried out in a closed vial in the presence of hexane. The evolved carbon disulfide was extracted by the organic solvent and injected in a flow system for its quantification as co...

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Bibliographic Details
Published in:Journal of agricultural and food chemistry 1999-01, Vol.47 (1), p.212-216
Main Authors: Bohrer, Denise, Cicero do Nascimento, Paulo, Gomes, Hélio Maciel
Format: Article
Language:English
Subjects:
Agrochemicals products
analytical methods
Biological and medical sciences
Carbon Disulfide - chemistry
degradation
determination
dithiocarbamate fungicides
Flow Injection Analysis - methods
food analysis
Food industries
Fruit and vegetable industries
Fundamental and applied biological sciences. Psychology
fungicide residues
Fungicides, Industrial - analysis
mancozeb
Maneb - analysis
Other agrochemicals used in plant protection (herbicides, fungicides, etc.)
Pesticide Residues - analysis
Phytopathology. Animal pests. Plant and forest protection
Pollution effects and side effects of agrochemicals on crop plants and forest trees. Other anthropogenic factors
Pollution effects. Side effects of agrochemicals
Zineb - analysis
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Summary:The sample decomposition of the carbon disulfide evolution method for the determination of dithiocarbamate residues was carried out in a closed vial in the presence of hexane. The evolved carbon disulfide was extracted by the organic solvent and injected in a flow system for its quantification as copper complex. The conditions for batch decomposition, flow injection determination, and association of both were investigated with sodium diethyldithiocarbamate as model substance. An one-channel flow system was employed where the carrier stream was the ethanolic ethylenediamine/copper solution. The determination range was of 0.01−1.26 μg of CS2, with a relative standard deviation of 0.06% (n = 10), with a sample throughput of 45 samples/h. The association of the batch decomposition with the flow system was carried out with the fungicide mancozeb and was applied to the analysis of its residue in potato, lettuce, cucumber, and green bean crops. The approach allowed the analysis of 11 samples in triplicate in 2 h, with recoveries between 85% and 92% and relative standard deviation about 2%. Keywords: Residue analysis; dithiocarbamates; carbon disulfide; FIA
ISSN:0021-8561
1520-5118
DOI:10.1021/jf980622s