Full
Outline
To establish a method for the determination of pentachloroanisole in wooden food contact materials by QuEChERS-gas chromatography-tandem mass spectrometry.
The prepared samples were added with pure water and zirconia beads, followed by ultrasonic extraction. Acetonitrile and a salt package(magnesium sulfate and sodium chloride) were sequentially added, and the mixture was shaken and centrifuged. The upper extract was purified by dispersive solid-phase extraction, concentrated to near dryness under nitrogen flow, redissolved by shaking with n-hexane, and filtered through a 0.22 μm microporous membrane. Separation was performed on a DB-5MS quartz capillary column (30 m×0.25 mm, 0.25 μm), and detection was carried out using an electron ionization source in multiple reaction monitoring mode. Quantification was achieved by the external standard method.
Pentachloroanisole showed a good linear relationship in the concentration range of 0.2–10.0 μg/L (r2=0.999). The limit of quantitation was 0.5 μg/kg, and the limit of detection was 0.2 μg/kg. Wooden samples were spiked with pentachloroanisole at 3 concentration levels, with 6 replicates at each level. The recoveries ranged from 85.3% to 97.4%, and the relative standard deviations were 3.0%–3.6%.
The method is simple to operate, with high sensitivity, specificity and precision, and is suitable for the determination of pentachloroanisole in wooden food contact materials.
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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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