Effects of Thiamethoxam and Fenvalerate Residue Levels on Light-Stable Isotopes of Leafy Vegetables.

The residual amounts of thiamethoxam and fenvalerate in the three vegetables showed a decreasing trend with extended time, and the degradation rates were slow.

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Thiamethoxam entering spinach could be gradually metabolized under the action of enzymes over time to produce thiamethoxam and other products [ 19 , 20 ] and the δ 13 C value could show a decreasing trend during this process, while the δ 15 N value might show an increasing trend due to the enrichment of 15 N.

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