Method for determining residues of chlorothalonil, captan, captafol and folpet in vegetables and fruits
A technology of chlorothalonil and captan, which is applied to the detection and application of pesticide residues, can solve problems such as instability and inability to obtain accurate and reliable quantitative results, and achieve accurate and reliable results
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[0028] Example 1
[0029] Unless otherwise specified, the percentages used in the present invention are all weight percentages.
[0030] A method for determining the residues of chlorothalonil, captan, dicaptan, and sterilant in vegetables and fruits, the specific steps are as follows:
[0031] 1. Sample preparation:
[0032] Cut the leafy vegetable samples into 2-3 cm sections, and cut the fruit samples into long, wide, and high 2-3 cm pieces.
[0033] 2. Treat the sample with phosphoric acid:
[0034] Accurately weigh 100g of the sample, add 50g of 5% phosphoric acid solution, smash and mix to prepare a uniform sample.
[0035] Since the four pesticides of chlorothalonil, captan, dicaptan, and sanitizer are unstable in alkaline environment, they will degrade when the matrix samples such as zucchini, rape, radish, cauliflower, and peaches are broken. The method of adding phosphoric acid is adopted during sample preparation, which avoids the loss of four pesticides during the sample prep...
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