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本文研究了用液相色谱法测定乳氟禾草灵的方法。采用Hypersil C18键合相色谱柱,三元流动相分离,紫外检测器检测。变异系数为0.74,回收率为98.9%。方法简便,准确。 相似文献
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Kaushik Banerjee Ajay Kumar Upadhyay Pandurang G. Adsule Sangram H. Patil Dasharath P. Oulkar Deepak R. Jadhav 《Food Additives & Contaminants》2006,23(10):994-999
Rates of degradation of λ-cyhalothrin and methomyl residues in grape are reported. The dissipation behavior of both insecticides followed first-order rate kinetics with similar patterns at standard and double-dose applications. Residues of λ-cyhalothrin were lost with pre-harvest intervals (PHI) of 12.0-12.5 and 15.0-15.5 days, corresponding to the applications at 25 and 50 g a.i. ha-1, respectively. In the case of methomyl, residues were lost with PHI of 55.0 and 61.0 days, following applications at 1 and 2 kg a.i. ha-1, respectively. The PHI, recommended on the basis of the experimental results, was shown to be effective in minimizing residue load of these insecticides below their maximum residue limits (MRLs) in vineyard samples. 相似文献
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利用两性表面活性剂十六烷基磺基甜菜碱(SB)的辅助作用实现了农药功夫菊酯(LCT)在锂皂石(LAP)中的插层。先用离子交换法将SB、十二烷基羧基甜菜碱(DCB)、十二烷基氧化胺(OA)和阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)分别插层LAP,然后用SB胶束将LCT引入层间,得到LCT/SB-LAP、LCT/DCB-SB-LAP、LCT/OA-SB-LAP和LCT/CTAB-SB-LAP复合材料。采用X射线衍射(XRD)、液体核磁共振(1HNMR)、电感耦合等离子发射光谱(ICP-OES)、傅里叶变换红外光谱(FT-IR)、热重/差热分析(TGA/DTA)和扫描电镜(SEM)对复合材料进行了表征。结果表明,LCT/SB-LAP、LCT/DCB-SB-LAP、LCT/OA-SB-LAP和LCT/CTAB-SB-LAP的层间高度分别为3.61、3.13、3.13和3.41 nm;LCT伴随SB分子成功进入LAP层间。提出了LCT在LAP中的插层机理。对复合材料中LCT释放行为的研究结果表明,释放速率和累积释放量主要依赖表面活性剂类型及其在层间的排列方式。 相似文献