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Dissipation of residues of mancozeb and metalaxyl in tomato (Solanum lycopersicum L.).

Bulletin of environmental contamination and toxicology (2012-12-18)
Ritu Rani, Vineet K Sharma, G S Rattan, Balwinder Singh, Neeraj Sharma
ABSTRACT

Dissipation of mancozeb and metalaxyl in tomato was estimated following four applications of a combination formulation Ridomil MZ (mancozeb 64% + metalaxyl 8%) at 0.25 and 0.50% at 10 days interval by carbon disulphide evolution method and gas liquid chromatography with nitrogen phosphorous detector, respectively. Half-life periods for mancozeb were 3.76 and 4.14 days, whereas for metalaxyl these values were 1.29 and 0.41 days at single and double the application rates, respectively. Residues of mancozeb dissipated below limit of quantification (LOQ) of 0.25 mg kg(-1) after 10 and 15 days at single and double the application dosage, respectively. Similarly, residues of metalaxyl took 3 and 5 days to reach LOQ of 0.02 mg kg(-1), at single and double dosages, respectively.

MATERIALS
Product Number
Brand
Product Description

Supelco
Zineb, PESTANAL®, analytical standard
Supelco
Mancozeb, PESTANAL®, analytical standard
Supelco
Maneb, PESTANAL®, analytical standard
Supelco
Metalaxyl, PESTANAL®, analytical standard
Metalaxyl, analytical standard