Full
Outline
To establish a method for determining the residual levels of 19 kinds of chlorophenol in wood products for food contact by gas chromatography-mass spectrometry (GC-MS).
The sample was extracted using methanol as the extraction solvent, and chlorophenols in wood products for food contact were extracted by ultrasound. After evaporation and concentration, they were dissolved in potassium hydroxide and derivatized with acetic anhydride. The derivatization was promoted by automatic vortexing, extracted with n-hexane,and detected by GC-MS. DB-5MS capillary chromatography column was selected for analysis, and the temperature was programmed to increase. Quantification was performed by internal standard method.
There was a good linear relationship between 19 kinds of chlorophenols in the mass concentration range of 1–50 μg/L, with a correlation coefficient (r2) greater than 0.999. When the addition concentrations were 2, 5 and 20 μg/kg, the recovery rates of 19 kinds of chlorophenols in food contact wood products were between 85.60%–109.32%. The limits of detection were 1.75–1.98 μg/kg, the limits of quantitation were 4.71–4.98 μg/kg, and the relative standard deviations range were less than 5.0% (n=6).
The sensitivity, precision and limit of quantitation of this method meet the requirements of actual sample detection and can meet the daily determination of chlorophenol residue levels in wood products for food contact.
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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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