Phong Thai Khanh, Nhung Dang Thi Tuyet, Yamazaki Kenichi, Takagi Kazuhiro, Watanabe Hirozumi
Tokyo University of Agriculture and Technology, 3-5-8, Saiwaicho, Fuchu, Tokyo 183-8509, Japan.
Chemosphere. 2009 Feb;74(8):1085-9. doi: 10.1016/j.chemosphere.2008.10.050. Epub 2008 Dec 4.
The behavior of sprayed tricyclazole in rice paddy lysimeters was studied. Tricyclazole residues were measured from rice leaves and paddy water after tricyclazole spraying in paddy lysimeters. The rate of photolysis and hydrolysis of tricyclazole on the surface of rice leaves was also determined in a laboratory experiment. Tricyclazole was extracted from leaf and water samples and determined by liquid chromatography with UV or mass spectrometry. The hydrolysis half-lives of tricyclazole on rice leaves were 11.9 and 5.1 d for the formulated product and standard, respectively. The photolysis half-lives were longer, 16.4d for the formulated product and 20.9 d for the standard. In the paddy lysimeter, tricyclazole dissipation on leaves involved either biphasic first-order kinetics or single-phase first-order kinetics, depending on the rainfall pattern. Half-lives of tricyclazole on lysimeter rice leaves were from 3.0 to 5.7 d. The dissipation of tricyclazole in paddy water followed single-phase first-order kinetics with half-lives ranging from 2.1 to 5.0 d.
研究了稻田渗漏计中喷施三环唑的行为。在稻田渗漏计中喷施三环唑后，测定了水稻叶片和稻田水中的三环唑残留量。还通过实验室实验测定了三环唑在水稻叶片表面的光解和水解速率。从叶片和水样中提取三环唑，并通过紫外液相色谱法或质谱法进行测定。三环唑制剂和标准品在水稻叶片上的水解半衰期分别为11.9天和5.1天。光解半衰期更长，制剂为16.4天，标准品为20.9天。在稻田渗漏计中，根据降雨模式，三环唑在叶片上的消散涉及双相一级动力学或单相一级动力学。三环唑在渗漏计水稻叶片上的半衰期为3.0至5.7天。三环唑在稻田水中的消散遵循单相一级动力学，半衰期为2.1至5.0天。
