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Objective To investigate and analyze the current situation of pesticide residues in tea in Tongzhou District market of Beijing in 2024. Methods This study tested and analyzed 17 kinds of pesticide residues in 262 tea samples by using gas chromatography-tandem mass spectrometry (GC-MS/MS). Results The detection rate of pesticide residues in tea in Tongzhou District was 96.56%. Especially, the detection rate of chlorfenapyr was the highest (89.31%) and bifenthrin was the second (85.11%). Furthermore, two kinds of prohibited pesticides (methyl parathion and methamidophos) and 2 kinds of restricted pesticides (fenvalerate and ethoprophos) were detected. These 4 kinds of harmful pesticides exceeded the maximum residue limits. In addition, the obsolete pesticide hexachlorobenzene was detected in other 5 samples. The analysis of residue characteristics revealed that 75.57% of the samples had 2-5 kinds of compound residues, of which oolong tea had the most residues. There were 6 tea detected to have excessive pesticide residues. The exceedance rate in descending order was white tea (12.20%), oolong tea (10.77%), dark tea (8.11%), green tea (6.52%), yellow tea (5.88%), black tea (1.79%). There was no significant difference in pesticide detection rate among different markets (P>0.05). Conclusion The detection rate of pesticide residues in tea in Beijing Tongzhou market is high, and complex pollution is common, but the overall over-standard rate is low (7.63%). The presence of prohibited and restricted pesticides in some samples highlights the need for stricter source control and routine monitoring by relevant authorities to ensure tea quality and safety.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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