Abstract
Spirotetramat is a new pesticide against a broad spectrum of sucking insects and exhibits a unique property with a two-way systemicity. In order to formulate a scientific rationale for a reasonable spray dose and the safe interval period of 22.4 % spirotetramat suspension concentrate on controlling vegetable pests, we analyzed degradation dynamics and pathways of spirotetramat in different parts of spinach plant (leaf, stalk, and root) and in the soil. We conducted experimental trials under field conditions and adopted a simple and reliable method (dispersive solid phase extraction) combined with liquid chromatography-triple quadrupole tandem mass spectrometry to evaluate the dissipation rates of spirotetramat residue and its metabolites. The results showed that the spirotetramat was degraded into different metabolite residues in different parts of spinach plant (leaf, stalk, and root) and in the soil. Specifically, spirotetramat was degraded into B-keto, B-glu, and B-enol in the leaf; B-glu and B-enol in the stalk; and only B-enol in the root. In the soil where the plants grew, spirotetramat followed a completely different pathway compared to the plant and degraded into B-keto and B-mono. Regardless of different degradation pathways, the dissipation dynamic equations of spirotetramat in different parts of spinach plant and in the soil were all based on the first-order reaction dynamic equations. This work provides guidelines for the safe use of spirotetramat in spinach fields, which would help prevent potential health threats to consumers.
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Acknowledgments
The authors acknowledge the financial supports from the Natural Science Foundation of Jiangsu Province (BK20130443), Key Research and Development Program of Jiangsu Province (BE2015354), and Key Research and Development Program of Yangzhou City (YZ2015029). Also, we are very grateful for the grants from the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (13KJB210010) and Graduate Students’ Practice Innovation Training Program of Higher School (KYLX15_1373).
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Chen, X., Meng, Z., Zhang, Y. et al. Degradation kinetics and pathways of spirotetramat in different parts of spinach plant and in the soil. Environ Sci Pollut Res 23, 15053–15062 (2016). https://doi.org/10.1007/s11356-016-6665-6
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DOI: https://doi.org/10.1007/s11356-016-6665-6