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利用气相色诤质谱(GC-MS)分析了甲胺磷中毒者的检材(血,胃内容物),均检出了O,O,S-三甲基硫赶磷酸酯,确未检出过甲胺磷。研究了这一现象的原因和确定了O,O,S-三甲基硫赶磷酸酯(O,O,S-TMTP)可作为甲胺磷中毒的佐证物。 相似文献
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Organophosphates present serious fulmination in several aspects of human life. Detection of organophosphates is frequently based on following acetylcholinesterase (AChE) inhibition. Although limit of detection and sensitivity for AChE-based assays seem to be intriguing, the identification of organophosphates is not currently efficient in this way. We introduce an improvement of AChE-based assay by reactivators using a selective come-back of AChE activity after previous inhibition. We have chosen four organophosphates: paraoxon-ethyl, paraoxon-methyl, trichlorfon, methamidophos as representative pesticides and the three most available reactivators: HI-6, obidoxime, pralidoxime. Reactivation was realized in the 96-wells photometric microplates and activity of human recombinant AChE was followed by reaction of Ellman's reagent with one of enzyme digestion product: thiocholine. Distinguishing of reactivation efficacy was judged by the independent two population t-test. The most significant identification was based on methamidophos inhibited AChE reactivation by HI-6 or pralidoxime and paraoxon-ethyl inhibited AChE by obidoxime; moreover, identification of trichlorfon and paraoxon-methyl was possible, too. Practical impact of described method is discussed. 相似文献
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A new molecularly imprinted polymer (MIP) was prepared using methamidophos (MAP) as the template molecule based on non‐covalent interaction. The complexes formed between template and monomers before polymerization were characterized by 1H NMR titration test, FT‐IR and UV spectrometry study. These studies indicated that a 1:2 molecular complex formed dominantly between MAP and functional monomers. A model mainly involving cooperative hydrogen interaction was proposed by exact placement of functional groups. Association constant was estimated to be 2.894 × 106 L2/mol2. When the initial concentration of MAP was 1.0 mmol L?1, the affinity capacity of MIP was 4.23 times that of NIP. The binding performance of MIP was modeled with the Freundlich isotherm (FI) and the total number of binding sites was calculated to be 33.97 μmol/g. The MIP showed great homogeneity with a heterogeneity index of m = 0.7356. The specificity of MIP was investigated by single‐analyte binding and molecularly imprinted solid‐phase extraction (MISPE) assays using MAP and other structurally related organophorous pesticides (OPPs). The results indicated that the MIP had a marked preference for MAP. 相似文献
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农药甲胺磷人工抗原的光谱鉴定研究 总被引:6,自引:1,他引:5
对农药甲胺磷人工抗原BSAM的光谱进行了鉴定 ,鉴定结果表明 :人工抗原BSAM的紫外光谱图与原载体和半抗原的紫外光谱相比均发生变化 ;人工抗原BSAM的红外光谱图上具有与甲胺磷分子相似的P—O—C和PO特征吸收峰 ;人工抗原BSAM具有与标准甲胺磷一致的3 1 PNMR化学位移峰 ,磷钼蓝分光光度法测定人工抗原BSAM中的磷浓度后计算出人工抗原BSAM的偶联率为 1 1。4种光谱方法测定结果综合表明甲胺磷人工抗原BSAM合成成功。 相似文献
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Annick D. St-Amand & Louise Girard 《International journal of environmental analytical chemistry》2013,93(10):739-748
Acephate and its metabolite, methamidophos, are both highly polar organophosphorus pesticides (OPs) and are therefore highly soluble in water, which leads to difficulties when traditional methods of extraction, such as LLE (liquid–liquid extraction), are used. Solid-phase extraction (SPE) is a relatively new, highly versatile method, which has proven successful in many cases that were considered problematic in the past. In this study, several adsorbents (polymeric and silica based) and parameters are considered and modified to obtain maximum recovery. Maximum recoveries for acephate and methamidophos were found to be 90–95% and 85–90% respectively with Oasis HLB cartridges and methylene chloride as the elution solvent. In order to establish applicability and reliability, the matrix effect of several real water and solid (compost and soil) samples was evaluated. A 20–30% diminution of recovery is noted for some samples with a complex matrix containing a high amount of dissolved organic matter. 相似文献
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β-环糊精增敏荧光法快速测定蔬菜中有机磷农药残留 总被引:3,自引:0,他引:3
植物酯酶催化底物乙酸-1-萘酯分解为荧光物质1-萘酚,采用荧光法测定1-萘酚的荧光强度,由于β-环糊精对1-萘酚的包络作用,荧光强度显著增加,使检测灵敏度得以提高.该体系用于蔬菜中甲胺磷农药残留测定,相关系数R为0.997,线性范围为2~50mg/L,方法的检测限为0.5mg/L. 相似文献
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茶叶中多种有机磷农药残留量测定不确定度的评定 总被引:7,自引:0,他引:7
利用实验室内部方法《茶叶中多种有机磷农药残留量检验方法》测定茶叶中甲胺磷、乐果和三唑磷的质量分数,从而评定其不确定度。 相似文献