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Outline
To study the residue pattern and dissipation dynamics of 15% chlorfenapyr·chlorantraniliprole suspension concentrate on Malus domestica and assess its dietary risk.
The samples were pretreated by QuEChERS method, extracted with acetonitrile, purified by salt-out, and then filtered to a certain volume. The detection was carried out by ultra performance liquid chromatography-tandem mass spectrometry.
At a sampling interval of 21 d, the median residues of chlorfenapyr and chlorantraniliprole in Malus domestica were 0.042 mg/kg and 0.040 mg/kg, respectively, with the highest residue concentrations being 0.37 mg/kg and 0.26 mg/kg. The 7 d after application, the dissipation rates of chlorfenapyr and chlorantraniliprole were 23.5% to 86.7% and 21.8% to 61.7%, respectively; 28 d after application, the dissipation rates of chlorfenapyr and chlorantraniliprole were 49.4% to 88.9% and 45.5% to 83.3%, respectively. The half-lives of chlorantraniliprole and chlorfenapyr were 4.6 d to 31.9 d and 2.8 d to 27.8 d, respectively. For long-term dietary risk, the risk quotients of chlorfenapyr and chlorantraniliprole in Malus domestica were between 0.0016% and 1.0%, far below 100%; for short-term dietary risk, the risk quotient of chlorfenapyr in Malus domestica was between 21.46% and 67.90%, while chlorantraniliprole had no acute reference dose, thus its acute risk quotient could not be calculated. The maximum residue limits of chlorfenapyr and chlorantraniliprole in Malus domestica were both lower than the estimated maximum residue levels.
According to the recommended dosage and the recommended pre-harvest interval, the residues of chlorfenapyr and chlorantraniliprole in Malus domestica are both below the maximum residue limits, and the dietary risks to consumers are acceptable. However, it is necessary to closely monitor the short-term dietary risk of chlorfenapyr to children aged 2 to 13, and be vigilant against the high exposure risk caused by large intake in a short period.
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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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