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Outline
To establish a method for the simultaneous determination of prometryn and fenpropathrin residue in Apostichopus japonicus by solid-phase extraction-gas chromatography-mass spectrometry (SPE-GC/MS).
The samples were extracted with acetonitrile. The extracts were purified using a Cleanert Florisil solid-phase extraction column and then reconstituted in n-hexane. Matrix-matched standard solutions were prepared, and detection was performed in selected ion monitoring mode. The effects of different extraction solvents, solvent volumes, solid-phase extraction columns and elution ratios on extraction efficiency were compared.
At spiked levels of 5–20 μg/kg, the recoveries of prometryn ranged from 86.3% to 106.0%, with relative standard deviations of 5.4%–11.6%, and the limit of quantitation was 5 μg/kg. For fenpropathrin at spiked levels of 7–20 μg/kg, the recoveries ranged from 95.9%–113.6%, with relative standard deviations of 4.1%–10.8%, and the limit of quantitation was 7 μg/kg.
This method is simple, efficient and accurate, making it suitable for both qualitative and quantitative determination of prometryn and fenpropathrin residues in Apostichopus japonicus.
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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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