State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, PR China.
Ecotoxicol Environ Saf. 2011 Jul;74(5):1331-5. doi: 10.1016/j.ecoenv.2011.02.009. Epub 2011 Mar 24.
The dissipation and residual levels of dimethomorph in pepper and soil under field conditions were determined by gas chromatography with an electron capture detector (GC-ECD). The dissipation rates of dimethomorph were described using first-order kinetics and its half-life ranged from 1.7 to 3.8 days in pepper and 11.5-18.5 days in soil. At harvest time, the terminal residues of dimethomorph were below the EU's maximum residue limit (MRL, 0.5 mg kg⁻¹) in pepper when measured 7 days after the final application, which suggested that the use of this fungicide was safe for humans. The collected field samples were stable for up to two months when refrigerated at -20°C. The residues persistence varied among three geographically separated experimental fields, suggesting that it might be affected by climatic, soil properties and local microorganisms. These results will be helpful in setting MRL guidance for dimethomorph in pepper in China.
采用气相色谱法-电子俘获检测器（GC-ECD），测定了田间条件下二甲戊灵在辣椒和土壤中的消解和残留水平。采用一级动力学方程描述二甲戊灵的消解动态，其在辣椒中的半衰期为 1.7-3.8 天，在土壤中的半衰期为 11.5-18.5 天。收获时，末次施药后 7 天，辣椒中二甲戊灵的最终残留量低于欧盟最大残留限量（MRL，0.5mg/kg），表明该杀菌剂对人体使用是安全的。采集的田间样品在-20°C 冷藏时，稳定至少两个月。在三个地理位置不同的实验田中，残留持久性存在差异，这表明可能受气候、土壤特性和当地微生物的影响。这些结果将有助于制定中国辣椒中甲戊灵的 MRL 指导值。
