Anderson Scott C, Chu Linh, Bouma Chandra, Beukelman Logan, McLouth Rayna, Larson Evan, Nienow Amanda M
a Department of Chemistry , Gustavus Adolphus College , Saint Peter , Minnesota , USA .
J Environ Sci Health B. 2019;54(2):129-137. doi: 10.1080/03601234.2018.1511400. Epub 2018 Oct 4.
A direct, controlled comparison of the photodegradation of imazethapyr has been made between imazethapyr in aqueous solutions, imazethapyr on the surface of epicuticular waxes of corn and soybean plants, and imazethapyr on the surface of intact corn and soybean plant leaves. In some experiments, the imazethapyr solutions were allowed to evaporate partially or fully after application to better model environmental conditions. The photodegradation of imazethapyr was fastest in aqueous solutions (k = 0.16 ± 0.02 h) and slowest on the surface of corn and soybean plants (k = 0.00048 ± 0.001 h and k = 0.00054 ± 0.003 h). Experiments allowing evaporation during irradiation have intermediate rate constants (e.g., k = 0.082 ± 0.005 h). Finally, identification of photoproducts was also examined on epicuticular waxes of corn and soybean plants for the first time.
已对咪唑乙烟酸在水溶液中、在玉米和大豆植株表皮蜡质表面以及在完整玉米和大豆植株叶片表面的光降解进行了直接的对照比较。在一些实验中，咪唑乙烟酸溶液施用于植株后，允许其部分或全部蒸发，以便更好地模拟环境条件。咪唑乙烟酸在水溶液中的光降解最快（k = 0.16±0.02 h），在玉米和大豆植株表面最慢（k = 0.00048±0.001 h和k = 0.00054±0.003 h）。在光照期间允许蒸发的实验具有中间速率常数（例如，k = 0.082±0.005 h）。最后，还首次在玉米和大豆植株的表皮蜡质上对光产物进行了鉴定。
