In order to clarify the residue status of plant growth regulators in melons from different production areas and to explore the residue risk,in this study,132 melon samples from Guangxi,Hainan,Hebei,Liaoning,Jiangsu and Jilin in 2020 were used as the research objects.Quantitative analysis of the residue levels of six plant growth regulators in these samples was carried out with reference to DB65/T 3970-2017"Determination of residues of 17 plant growth regulators in vegetables and fruits by liquid chromatography-tandem mass spectrometry".The differences in residues of plant growth regulators in the melons from different production areas were compared,and then the acute and chronic risk assessment and risk ranking fordietary intake of residual plant growth regulators in the melons from different production areas were carried out.There were 5 kinds of plant growth regulators left in the melon samples,among which abscisic acid residues accounted for the highest proportion(72.13%),followed by paclobutrazole,chlorpyramide,and enbutrazole(accounting for 11.48%,9.29%,4.37%and 2.73%,respectively).In terms of the five residual plant growth regulators,the chronic risk of their dietary intake ranged from 0%to 0.119 7%,with an average value of 0.015 2%;The acute risk of their dietary intake ranged from 0%to 9.714 1%,with a mean value of 0.669 2%.Both risks were well below 100%and at a safe level.Risk ranking score revealed that there were no high-risk plant growth regulators,and the risk scores of residual samples from different origins were different.Based on the proportion of residual samples,acute and chronic dietary risk assessment and risk scores,eMRL recommends to formulate and revise the maximum residue limits of paclobutrazole,polycarboxylin and enbutrazole to 9,4 and 1 mg/kg,respectively,and the residue risks of abscisic acid and paclobutrazole are relatively high.Thus,it is recommended to pay more attention.
melonplant growth regulatorsrisk assessmentrecommended maximum residue limit
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