Identification of pesticide residues in harvested edamame soybeans and application of the water ozonation technique
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Abstract
The results showed that four types of active compounds in the pesticide including Captan, Methyl thiophanate, Imidacloprid, and Cypermethrin which were used as standards for detecting residues in Edamame, the Imidacloprid, and Cypermethrin types were not found in either the soybeans harvested from the farmer or the company fields. On the other hand, Methyl thiophanate residue was found in the fresh shells of soybeans harvested from the company, while Captan residue was found in soybean intact pods harvested from the farmer’s field. Captan and Methyl thiophanate have different properties when applied in the field. Captan is a type of pesticide compound that dissolves easily during the washing process, but using it for a long period causes accumulation on tissues and it is difficult to remove. Meanwhile, Methyl thiophanate residue is included in the insoluble category or does not easily decompose when washed, and it can permeate into all parts of Edamame. The ozonated-water technique with a dose of 0.12 ppm for 1 h was able to reduce the residue of Captan pesticide by 30.13% on the shells and intact pods of Edamame, while Methyl thiophanate residue can be reduced up to 80.97% on the shells of Edamame seeds.
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