Analysis and Risk Assessment of Seven Conventional Pesticides Residue in Brewing Sorghum Grains Grown in Hebei Province
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Abstract:
To understand the situation of pesticide residues in sorghum grains grown in Hebei province, 20 sorghum grain samples and one liquor sample were collected, and the sample information in detail, such as producing areas, varieties, cultivation techniques, used pesticides and so on, were recorded. Seven conventional pesticide residues, including, atrazine, imidacloprid, pirimicarb, carbofuran, benzene hexachloride, chlorpyrifos, and chlorantraniliprole, were detected in samples according to GB/T 20770-2008 and GB 23200.113-2018. Each pesticide residue in sorghum was assessed according to GB 2763-2019. The results showed that the percentage of grain samples containing pesticide residues was 80%, and the percentage of grain samples containing pesticide residues exceeding maximum residue limits (MRLs) was 25%, but there was no pesticide residue in liquor sample. The residues of chlorpyrifos and chlorantranliliprole were found at or above the detection limits, with the detection rates were 70% and 25%, respectively. The maximum residue of chlorantranliliprole was 726 μg/kg, which was above MRL. In samples used pesticides, the detection rate and the over-standard rate of chlorpyrifos were 100% and 0, respectively, and that of chlorantraniliprole were both 50%. In samples used pest control methods with and without pesticides, the over-standard rates of pesticide residues were 41.67% and 0, respectively. Of all the varieties tested, the pesticide detection rates in Jiniang No. 2 and Jiniang No. 3 were both 75%, and lower than that in others. The pesticide over-stand rates in Hongmaoliang No. 6 and Jiniang No. 2 were 0 and 12.50%, respectively, and lower than that in others. The findings of this work could provide a theoretical basic for confirming pesticide residues detection items in brewing sorghum, and a reference for distilleries to choose safe brewing sorghum grains.
