50%麦草净高效液相色谱分析

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％     

莠去津和异丙甲草胺的同柱气相色谱分析

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/…     

15%田草灵高效液相色谱分析

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％。     

异丙甲草胺的气相色谱分析

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。     

2009年授权的专利集锦(十四)

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,     

40%莠去津·乙草胺·异丙甲草胺悬乳剂气相色谱分析

建立了40%莠去津·乙草胺·异丙甲草胺悬乳剂的气相色谱分析方法,以邻苯二甲酸二正戊酯为内标物,使用HP-5毛细管柱和氢火焰离子化检测器进行分离和测定。莠去津、乙草胺和异丙甲草胺线性相关系数分别为0. 9994、0. 9992和0. 9991,标准偏差分别为0. 09%、0. 13%和0. 11%,变异系数分别0. 45%、1. 4%和0. 96%,回收率分别为98. 4%～100. 8%、98. 2%～100. 9%和98. 5%～100.7%。该方法简便、快速,精确度和准确度高,线性关系好。     

异丙甲草胺在稻田环境中的降解与残留研究

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。     

毛细管气相色谱法同时测定异丙甲草胺和莠去津

采用毛细管气相色谱法,在R tx-1701(30 m×0.32 mm×0.25μm)毛细管柱上以三唑酮为内标,氢火焰离子化检测器(FID)检测对异丙甲草胺和莠去津混剂,标准偏差分别为0.23%、0.20%,变异系数分别为0.919%、0.995%,线性相关系数分别为0.9987、0.9992,平均回收率为:99.7%、99.6%。     

精-异丙甲草胺在大豆及土壤中的残留动态

为了评价精-异丙甲草胺在大豆上的残留动态及环境安全性,在天津、吉林两地同时进行了精-异丙甲草胺在大豆上的残留动态试验.结果表明,天津地区精-异丙甲草胺在大豆植株中的半衰期为19.1 d,在土壤中的半衰期为27.9 d;吉林地区精-异丙甲草胺在大豆植株中的半衰期为21.4 d,在土壤中的半衰期为34.1 d.收获的大豆籽粒中精-异丙甲草胺最终残留量均为未检出.     

高效异丙甲草胺的高效液相色谱手性分离分析

以正已烷-异丙醇(体积比80:20)为流动相.使用(R,R)-Whelk-01手性柱,在230 nm条件下使用紫外检测器,实现了对高效异丙甲草胺S-异构体的分离和测定,外标法定量.测定高效异丙甲草胺的回收率在98.6%～100.2%之间,标准偏差为0.17,变异系数为0.18%.     

苄嘧磺隆—异丙甲草胺混剂的HPLC分析

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％。     

50%异甲·特丁净乳油防除花生田杂草的效果

为明确50%异甲·特丁净乳油在花生田的应用前景,采用田间小区试验、取样考种的方法,观察了其对花生田主要杂草的控制作用和对花生产量的影响。结果表明,50%异甲·特丁净乳油对花生田马唐、牛筋草、反枝苋、马齿苋等多种一年生杂草均有好的防除效果,随用药量的增加防效逐渐提高,药后40d株防效在85%以上,鲜重防效在90%以上,好于异丙甲草胺、特丁净两药剂单用常规剂量处理的防效,显著提高了花生的产量。     

Preparation of Berberine-montmorillonite-metolachlor formulations from hydrophobic/hydrophilic mixtures

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.     

大花萱草化学除草试验

大花萱草(Hemerocallis middendorfii)移栽定植后施用33％二甲戊乐灵乳油、72％异丙甲草胺乳油进行土壤处理防除杂草试验,结果表明：药后30d,33％二甲戊乐灵1500ml／hm^2(制剂含量,下同)除草效果在92％以上,72％异丙甲草胺1350～1800ml／hm^2除草效果则在90％以上。应用上述剂量除草剂定植后施用于大花萱草田,对大花萱草植株安全。     

Entrapping pesticides by coagulating smectites

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.     

Carboxylmethylcellulose/bentonite composite gels: Water sorption behavior and controlled release of herbicide

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     

气相色谱法测定3，3-二甲基丁醛的含量

建立了用毛细管色谱柱气相色谱内标法分析测定3,3-二甲基丁醛的方法,选用Hp-225毛细管柱,目标组分的分离效果良好。在选定的实验条件下利用内标法分析测定了3,3．二甲基丁醛的含量。结果表明,内标法测定3,3-二甲基丁醛的相对标准偏差不大于2％,回收率在96．96％-100．87％之间。该方法为3,3．二甲基丁醛生产企业分析检测提供了一种快速、可靠的方法。     

毛细管气相色谱法测定三(3-羟丙基)膦反应液中丙烯醇的含量

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.