Pollution status of 15 pesticides residues in local tea samples in Guangdong Province

Abstract

ObjectiveTo understand the pollution level of multi-pesticides residues in local tea samples in Guangdong Province, and clarify the quality and safety of tea, so as to provide a basis for production supervision and consumption.Methods110 local tea samples were collected in Guangdong Province, 10 kinds of pyrethroids pesticide and 5 kinds of organochlorine pesticides residues were detected by GC-MS/MS and evaluated according to the national standard GB 2763—2021.ResultsAmong the 110 samples, only 10 pesticides were detected, and bifenthrin, fenpropathrin and cypermethrin were the mainly detected varieties. The highest frequency of detection was bifenthrin (73.64%) with an average value of 0.346 mg/kg. It was oolong tea that had the highest average value; excessive contents of fenvalerate or fenpropathrin were only found in four tea samples; the phenomenon of multi-pesticides residue was existed. The pollution levels of bifenthrin, fenpropathrin and cypermethrin in eastern Guangdong (Chaozhou and Meizhou) were high, while the pollution levels in northern Guangdong (Shaoguan and Qingyuan) and the Pearl River Delta (Zhaoqing) were relatively low.ConclusionThe detection rates of pesticide residues in local tea samples in Guangdong Province were high, but the exceeding rates were low. The government supervision departments should focus on the monitoring of bifenthrin, fenpropathrin and cypermethrin in teas.

Keywords

• local tea
• multi-pesticides residues
• pollution status