Synthesis and properties of a glyphosate isopropylamine salt slow-release agent via γ-ray irradiation
To improve the rate of pesticide utilization,reduce pesticide usage,and effectively eliminate the adverse effects of pesticides on the environment,a carrier material was prepared by modifying starch using a one-step irradiation treatment.This carrier material was subsequently loaded with glyphosate isopropylamine salt to synthesize a glyphosate isopropylamine salt slow-release agent.The morphology and composition of this slow-release agent were characterized using scanning electron microscopy and infrared spectroscopy,and the slow-release performance,surface tension,and herbicidal activity of the different drug-loaded systems were also examined.Compared with the unloaded and attapulgite-loaded glyphosate isopropylamine salts,the rate of release obtained using the slow-release agent was reduced by 44.00%and 20.45%at 720 min,respectively.The release equilibrium time of the attapulgite-loaded glyphosate isopropylamine salt was 1 440 min,whereas that of the slow-release agent was 1 700 min.Based on the kinetic analysis and fitting,the first-order model correlation coefficient R2 of the glyphosate isopropylamine salt release curve ranged from 0.956 6 to 0.997 2,indicating that the fitting accuracy was high.Furthermore,a comparison of herbicidal activities showed that this glyphosate isopropylamine salt slow-release agent exhibited an improved control effect on barnyard grasses.In summary,the method for obtaining carrier materials by irradiation is simple,efficient,energy-saving,and environmentally friendly.The glyphosate isopropylamine salt slow-release agent synthesized based on this exhibited favorable slow-release performance and herbicidal activity,providing a new approach for the development of slow-release pesticides.
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