Full
Outline
To establish a method for the determination of acetochlor, metolachlor and propisochlor residues in green soybeans, soybeans and soybean oil, and to investigate the interference of structurally related compounds on the quantification of acetochlor quantified as its metabolites.
Residues of the 3 kinds of parent herbicides were determined by QuEChERS pretreatment combined with ultra performance liquid chromatography-tandem mass spectrometry. On the basis of the same extract, alkaline hydrolysis and liquid-liquid extraction procedures were introduced, and an analytical strategy for hydrolytic conversion was established using 2-methyl-6-ethylaniline (EMA) as an indicator, with systematic optimization of hydrolysis and cleanup conditions.
Good linearity was obtained for the 3 kinds of parent pesticides and EMA within the corresponding concentration ranges. The average recoveries ranged from 77.8% to 106.6%, and the limits of quantitation were all 0.02 mg/kg. Metolachlor and propisochlor could both be converted to EMA under alkaline heating conditions, thereby interfering with the quantification of acetochlor expressed as EMA.
This method can meet the requirements for accuracy, precision and sensitivity in the determination of parent residues of acetochlor, metolachlor and propisochlor, as well as the hydrolysis product EMA, in green soybeans, soybeans and soybean oil.
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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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