Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 64, Issue 14, Pages 2841-2846Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.6b00231
Keywords
phoxim; microcapsule; urea-formaldehyde resin; polyurea; contact toxicity; stomach toxicity
Funding
- National Natural Science Foundation of China [31572040, 31501651]
- Natural Science Foundation of Shandong Province [ZR2015CQ017]
- Special Fund for Agro-scientific Research in the Public Interest from the Ministry of Agriculture of China [201303027]
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The application of pesticide microcapsules (MCs) in agriculture is becoming more and more popular. In this study, the effects of different wall materials on the stomach toxicity, contact toxicity, length of efficacy, and photolysis characteristics of pesticide microcapsules were investigated. The results showed that microencapsulation reduced the stomach and contact toxicities of phoxim and prolonged the efficacy of this light-sensitive chemical in the greenhouse test. Neither of the degradation curves for microencapsulated phoxim under ultraviolet light fit a first-order model, although the emulsifiable concentrate (EC) degradation curve fit it well. The phoxim-loaded polyurea microcapsules (PUA-MCs) showed significantly increased UV-resistance ability, stomach toxicity, and contact toxicity compared with the phoxim-loaded urea formaldehyde microcapsules (UF-MCs). These experiments indicated that it is crucial to select the appropriate wall materials for pesticide microcapsules on the basis of application sites and physicochemical properties of pesticide active ingredients.
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