Inspection of agricultural products (vegetables, fruits)

6.4.1 Chromatographic reference conditions 6.4.1.1 Chromatographic column pre column: 1.0 m, 0.53 mm inner diameter, deactivated quartz capillary column. Two chromatographic columns, respectively; A-column: 50% polyphenylmethylsiloxane (DB-17 or HP-50+) 'column, 30 m × 0.53 mm × 1.0 um, or equivalent; B-column: l100% polymethyl siloxane (DB-1 or HP-1) 'column, 30 m × 0.53 mm × 1.50 um, or equivalent. 6.4.1.2 Temperature of the sample inlet: 220 ℃. Detector temperature: 250 ℃. Column temperature: 150 ℃ (maintained for 2 minutes) -, BC/min. 250 ℃ (maintained for 12 minutes). 6.4.1.3 Gas and flow carrier gas; Nitrogen, purity ≥ 99.999%, flow rate of 10 mL/min. Gas; Hydrogen gas, purity ≥ 99.999%, flow rate of 75 mL/min. auxiliary gas; Air, with a flow rate of 100 ml/min. 6.4.1.4 Injection method: Non split injection. The sample solution is in duplicate and injected simultaneously by a dual automatic sampler. 6.4.2 Chromatographic analysis: 1.0 pL. standard mixed solution and purified sample solution are respectively aspirated by an automatic sampler and injected into the chromatograph. Qualitative analysis is performed using dual column retention time, and the peak area of the sample solution obtained from column A is compared with the peak area of the standard solution for quantification. 7 Result expression 7.1 Qualitative analysis: Compare the retention time (RT) of unknown components in the sample solution measured by two columns with the retention time (RT) of the standard solution on the same chromatographic column. If the retention time of two groups of a certain component in the sample solution is within ± 0.05 minutes of the retention time of two groups of a certain pesticide in the standard solution, it can be considered as the pesticide

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