Investigation and Analysis of Pesticide Residues in Tea from Southern Shaanxi Province
In order to investigate the pesticide residues in tea from southern Shaanxi province,160 tea samples were collected from southern Shaanxi province and 50 pesticide residues were detected by gas chromatography-tandem mass spectrometry combined with QuEChERS.The detection results were judged by GB 2763-2021.The results showed that out of 160 tea samples from southern Shaanxi,a total of 72 pesticide residues were detected,with a detection rate of 45.0%.Two samples exceeded the standard,with a detection rate of 1.25%.The 26 pesticides were detected,of which pyrethroid and organic heterocyclic pesticides were the main ones.The pesticide with the highest detection rate was cyhalothrin.Three banned pesticides of benzene hexachloride,dichlorodiphenyltrichloroethane and dicofol,and four restricted pesticides of isocarbophos,fenvalerate,omethoate and dimethoate were detected.Among these banned and restricted pesticides,isocarbophos and omethoate exceeded the national standard.The detection rate of pesticide residues in black tea was higher than green tea with a statistical difference.The detection rates of pesticide residues showed no statistical differences in diverse packaging types and quality grades.In conclusion,a high detection rate of pesticide residues in tea from southern Shaanxi province is found,whereas the residue level and the exceed standard rate are relatively low.A part of tea from southern Shaanxi province is probably contaminated with banned or restricted pesticides,which indicates that the related supervision departments should reinforce the management of such types of pesticides to improve the quality and safety of the local tea.
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