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50%麦草净高效液相色谱分析 总被引:1,自引:0,他引:1
本文报道采用Nova-PakC18不锈钢色谱柱进行反相液相色谱分析,以V(甲醇)∶V(水)=65∶35(pH=3)为流动相,以邻苯二甲酸二乙酯为内标物,用内标法测定田草净除草剂中绿黄隆和异丙甲草胺的含量。结果表明,各有效成分与内标物色谱峰分离完全,杂质无干扰,测定结果,绿黄隆和异丙甲草胺的变异系数为1.14%和0.50%。回收率分别为:99.0%~101.4%和98.3%~100.6% 相似文献
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莠去津和异丙甲草胺复配是一种较理想的旱田除草剂 ,莠去津有化工行业标准 ,异丙甲草胺目前尚无标准。而两者分析方法均是采用气相色谱法 ,由于分析条件不统一 ,因此产品质量检控操作较繁锁 ,两者在同一色谱条件下进行气相色谱分析至今未见报道。本文所采用的相同色谱条件下同时测定两有效成分含量 ,分离效果好 ,操作简便 ,定量准确。1 实验部分1.1 仪器及试剂惠普HP1490型气相色谱仪 ,FID检测器 ;图 1 试样气相色谱图1 莠去津2 异丙甲草胺3 内标物10 μl注射器 ;莠去津标准品 :≥99% (m/m ) ;异丙甲草胺标准品 :≥ 98% (m/… 相似文献
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采用Nova-Pak C18不锈钢色谱柱进行反相液相色谱分析,以甲醇:水=65:35(V/V)为注动相,以邻苯二甲醇二乙酯为内标物,用内标法测定田草灵除草剂中苄嘧黄隆和异丙甲草胺的含量,结果表明,各有效成分与内标物色谱峰分离完全,杂质无干扰,测定结果,苄嘧黄隆和异丙甲草胺的变异系数分别为0.74%和1.07%,回收率分别为99.4% ̄100.8%和99.1% ̄101.3%。 相似文献
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异丙甲草胺的气相色谱分析 总被引:5,自引:0,他引:5
本敢相色谱法分析异丙甲草胺的含量,选用SE-30固定液,ChromsorbW-AWDMCS为担体制备色谱柱,以正二十一烷为内标物,方法的标准偏差为0.14%,变异系数为0.20%,异丙甲草胺的回收率在99.16-100.80%之间。 相似文献
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一种含有异丙甲草胺和特丁净的除草组合物本发明涉及一种含有异丙甲草胺和特丁净的除草组合物,它由异丙甲草胺和特丁净作为活性成分, 相似文献
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异丙甲草胺在稻田环境中的降解与残留研究 总被引:1,自引:0,他引:1
研究异丙甲草胺在水稻、土壤、田水中的残留分析方法及其消解动态和最终残留。样品以乙腈提取,净化后采用毛细管气相色谱法-电子捕获检测器进行测定。在0.005、0.05、1.00mg/kg3个添加水平,平均回收率为88.42%~101.25%,变异系数为1.49%~9.51%,符合农药残留分析的要求。运用上述方法,测定异丙甲草胺在稻田环境中的消解动态和最终残留。试验结果表明,异丙甲草胺在土壤和田水中消解较慢,在稻秆中消解则较快,在土壤、田水和稻秆的平均半衰期分别为42.63d、39.21d和17.42d;20%异丙甲草胺WP按有效成分用量950g/hm2,在直播水稻田水稻播种后施药1次,收获时异丙甲草胺在土壤、稻杆和稻谷中的残留量均低于0.05mg/kg。 相似文献
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苄嘧磺隆—异丙甲草胺混剂的HPLC分析 总被引:2,自引:0,他引:2
本文介绍了采用高效液相色谱法YWG-C18反相柱上,以甲醇,水作流动相,紫外检测器对苄嘧磺隆-异丙甲草胺混剂进行定量检测。该方法对两种有效成分测定的变异系数分别为0.34%和0.58%。 相似文献
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Metolachlor which is a pre-emergent hydrophobic herbicide with moderate solubility, was detected in several water wells in agricultural and even urban areas. This study aims for the preparation of organoclay platforms which could release metolachlor in a more controlled pattern, thus — reducing the leaching to groundwater. The adsorption of metolachlor to organoclays based on difenzoquat, diquat or berberine added up to neutralizing the original charge of the clay mineral was tested. The adsorption loadings of metolachlor on berberine-montmorillonite were found to be more than 30% of the compound, whereas for difenzoquat- and diquat-montmorillonite the amounts were only 3.8% and 4.9%, respectively. Consequently, further experiments were conducted focusing on berberine-montmorillonite. Loading of preadsorbed berberine was crucial to the hydrophobicity of the platforms and it had also influence on the adsorption of metolachlor in mixed immiscible phases experiments. The exact procedure of preparation was also a key issue on determining final metolachlor amounts on the formulation: Preparation of the formulation from suspended organoclay which was not dried after preadsorbing the berberine, and was mixed with metolachlor dissolved in chloroform gave the highest percentages of adsorbed herbicide. Release from organoclay formulation was at a more controlled fashion than for commercial herbicide, or commercial herbicide mixed with non-modified montmorillonite, leaving a relatively constant concentration of herbicide after several desorption cycles. 相似文献
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Highly delaminated montmorillonite (from Wyoming) with a high specific surface area when dispersed in water was used as an adsorbent of the hydrophobic herbicide metolachlor. The montmorillonite was coagulated with Na+, Ca2+, Al3+ and benzyl trimethylammonium ions. Ca2+ and Al3+ screened the surface charges and the adsorption of metolachlor was strongly enhanced by the interaction of metolachlor with the hydrophobic siloxane oxygen atoms and the water molecules of the hydration shell of the interlayer cations. With increasing salt concentration the mechanism changed from a cooperative adsorption process on a heterogeneous surface (S-type isotherm) to adsorption on a homogeneous surface (L-type). Coagulation with Ca2+ and Al3+ increased the amounts of metolachlor adsorbed from 14–41% (Na+) to 57–86% (Ca2+) and 67–91% (Al3+). The light microscopic images revealed that increasing amounts of metolachlor changed the band-type network into spherical “potato-like” aggregates. The enhanced herbicide adsorption hydrophobized the particles that crowded together to form spherical aggregates. Entrapping the herbicide molecules in clay mineral aggregates—either band-type networks or spherical aggregates—offers a useful tool in creating leaching-resistant herbicide formulations. 相似文献
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The composite gels were prepared by adding bentonite or its acid‐activated derivative into the carboxylmethylcellulose (CMC) gel, and the resulted products were characterized with infrared spectroscopy. Different from ordinary swellable hydrogels, the CMC/bentonite hydrogel beads shrinked in water. The water sorption of dried gels was limited below 120% of their own weight, and a sorption equilibrium reached quickly within 20–40 min. The water of swollen gels exists mainly in bound status according to the DSC analysis. The release experiments in water were carried out to evaluate the release of herbicide metolachlor from gel formulations. The release mechanism dominated by a Fickian diffusion might be related to the quick and limited swelling of dried gels. Addition of bentonites in CMC gel is beneficial for slowing the release of metolachlor, especially when the acid‐activated bentonite was added. The time taken for 50% of metolachlor to be released, t50 was prolonged to 158 h for the composite gel formulation based on acid‐activated bentonite from the 61.1 h for pure CMC gel formulation. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献
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建立了毛细管气相色谱测定三(3-羟丙基)膦反应液中丙烯醇含量的方法,采用35m×0.32 mm×0.3 μm PEG-20M毛细管色谱柱分离,FID检测器.在优化的条件下,以内标标准曲线法(正丁醇作为内标物)定量,测定的相对标准偏差为1.52%~2.50%,平均回收率为98.8%~100.6%,该方法具有简便、快速、准确的特点. 相似文献