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Outline
To clarify the residue and dissipation dynamics of 22% thiamethoxam•lambda-cyhalothrin microcapsule suspension-suspension concentrate in Glycine max L. Merr.
This paper conducted field trials in accordance with the reference to the NY/T 788—2018 Guidelines for the testing of pesticide residues in agricultural crops, and the residues and dissipation dynamics of in Glycine max L. Merr at different application doses by means of QuEChERS-liquid chromatography-tandem mass spectrometry (QuEChERS-LC-MS/MS) and QuEChERS-gas chromatography-tandem mass spectrometry (QuEChERS-GC-MS/MS).
Within the mass concentration ranges of 0.002–0.050 μg/mL and 0.005–0.500 μg/mL, thiamethoxam and lambda-cyhalothrin exhibited an excllent linear relationship between mass concentration and response values in Glycine max L. Merr matrices, and the correlation coefficients exceeded 0.99. In the recovery experiment, the average recovery rate for thiamethoxam was 79.9%–92.4% with the relative standard deviations 0.46%–8.71%, while that for lambda-cyhalothrin was 84.50%–97.10% with the relative standard deviations 0.39%–9.11%. According to the first-order kinetic equation fitting, the half-lives of thiamethoxam and lambda-cyhalothrin in Glycine max L. Merr during the degradation process were both less than 15 d, classifying them as readily degradable pesticides. At the recommended dosage and 2 times the recommended dosage, the half-lives of thiamethoxam were 10.7 d and 4.3 d, respectively; while for lambda-cyhalothrin, the half-lives were 3.3 d and 7.3 d, respectively. The residue dynamics of thiamethoxam and lambda-cyhalothrin at the recommended dosage showed an initial increase followed by a decrease, reaching peak levels 5 d after application before gradually degrading.After 14 days of application, at the recommended dose and 2 times the recommended dose, the residues of both thiamethoxam and lambda-cyhalothrin exceeded the maximum residue limit (MRL), posing a risk of pesticide overlimit.
In open-field Glycine max L. Merr production, 22% thiamethoxam•lambda-cyhalothrin microcapsule suspension-suspension concentrate should be strictly applied at the recommended dosage. It is advised to rigorously implement a safety interval of over 16 d or more and prohibit excessive dosage application.
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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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