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To develop an ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) method for the determination of eleven organophosphorus and ten neonicotinoid pesticides in vegetables.
Pesticides in sample were extracted with acetonitrile, cleaned up using a sorbent mixture of magnesium sulfate anhydrous, PSA and C18. The separation was performed on a HSS T3 column. Detection was operated on multiple reaction monitoring scan under positive electrospray ionization. Matrix-matched external standard calibration curves were used for quantification.
The linear rang of calibration curves ranged from 0.50-100 ng/ml. Good linearities (r>0.999) were obtained for all 21 pesticides. The average recoveries were 76.0%-119.3% with RSD<10% for all the analytes. The limits of detection and quantification were 0.02-1.7 μg/kg and 0.06-5.7 μg/kg, respectively. This method was applied to analyze 76 vegetable samples from market. Nine target pesticides were detected in 26 samples, with a contents of 0.012-3.16 mg/kg.
This method is simple, sensitive, and accurate, and it is suitable for the determination of organophosphorus and neonicotinoid pesticide residues in vegetables.
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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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