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首页> 外文会议>220th American Chemical Society, Meeting 2000 Washington, D.C. >Photostability of Two Fungicides on Spray Application Monitors: Effect of Paper and Formulation Type
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Photostability of Two Fungicides on Spray Application Monitors: Effect of Paper and Formulation Type

机译：两种杀菌剂在喷雾监控器上的光稳定性：纸张和配方类型的影响

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摘要

Application monitors are used to determine the accuracy and precision of pesticide applications made for terrestrial field dissipation studies. Our results show that the photostabilities of two fungicides were affected by the type of paper used as the application monitor and by pesticide formulation. In side-by-side comparisons using an emulsifiable concentrate (EC) formulation, rapid photodegradation of both fungicides occurred when applied to white ∝-cellulose paper. Only 10 to 35% of the applied ~(14)C-fungicides remained as parent after 15-min irradiation in a Suntest photolysis chamber. Dark controls exhibited no losses or degradation under study conditions. In contrast, greater than 85% of the compounds remained as parent when applied to brown Kraft paper. These effects were attributed, in part, to enhanced scattering of light by the white background of the ∝-cellulose paper. When applied as a suspension concentrate (SC) formulation, both fungicides were stable to photolysis on ∝-cellulose and Kraft papers. Differences between these formulations were attributed to either the presence of a photosensitizing agent in the EC and/or increased photostability of the active ingredients in the SC solid phase.
机译：应用监控器用于确定用于陆地野外消散研究的农药施用的准确性和精确性。我们的结果表明，两种杀真菌剂的光稳定性受用作施药监测器的纸张类型和农药配方的影响。在使用乳油（EC）制剂进行的并排比较中，将两种杀菌剂涂在白色β-纤维素纸上时都发生了快速的光降解。在Suntest光解室内照射15分钟后，仅10％到35％的〜（14）C杀菌剂仍为母体。在研究条件下，深色对照无损失或降解。相反，当应用于棕色牛皮纸时，仍有超过85％的化合物保留为母体。这些影响部分归因于α-纤维素纸的白色背景对光的散射增强。当以浓缩悬浮液（SC）制剂的形式使用时，两种杀菌剂均对α-纤维素纸和牛皮纸的光解作用稳定。这些制剂之间的差异归因于EC中存在光敏剂和/或SC固相中活性成分的光稳定性增加。

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