查询词典 acetonitrile

By using acetonitrile-water (pH=3.85) as the mobile phase, with a flow rate of 1.0mLmin^(-1), detected at 294nm, washed by gradientelution, the mian alkaloids can be separated in HPLC. The figure was applied to qualitative analysis, and quality control of alkaloids in thesium chinese turcz.in some extent.

在流动相为乙腈－水(pH=3.85)，流速为1.0mLmin1，检测波长为294nm的条件下，进行梯度洗脱，在HPLC图谱上百蕊草提取液中主要生物碱可得到理想分离，图谱可为定性分析提供依据，并可在一定程度上进行百蕊草生物碱物质的质量控制。

It was found that NBD-C is an efficient gelator of acetonitrile, and the gel system possesses very smart thixotropic property.

实验结果表明，NBD-C对乙腈具有很强的胶凝作用，且该凝胶体系具有显著的剪切触变性。

Waste oil category: Waste oil, waste hydraulic oil, waste oil, waste oil injection, waste kerosene, waste of white mineral oil, white waste oil, waste oil sparks, the repeal of toluene, waste cutting oil, gear oil, lubricants, batteries oil, spindle oil, zorra, oil, turpentine oil, solvent oil, gear oil, oil rails; waste chemical categories: one, the repeal of toluene, xylene waste, spent 2 pure benzene, acetone waste, waste Ding ketone, cyclohexanone 3 waste, waste dichloromethane, dichloroethane waste, waste Dichloropropane 4, solvent categories: soluble oil 6 #, 120 # dissolving agents, dissolving agents 200 # 5, trichloro ethylene, dichloromethane, trichloroethane; tetrachlorethylene, trichloromethane 6, the repeal of methanol, ethanol, waste, waste alcohol, isopropyl alcohol waste 7, the repeal of ethylene glycol, diethylene glycol waste, spent three 8 glycol, waste butyl acetate, ethyl acetate wastewater, waste acetate 9, the repeal of ethyl ether, acetonitrile waste, waste petroleum ether 10, cleaning categories: cleaning agent, washing machine water, days that water; wash board water,×oil wastewater liquid 11, the supply of tires category: special supply of fuel oil, non-standard oil, burner oil, waste oil and other refined crude oil.

废油类：废机油，废液压油，废柴油，废注塑机油，废煤油，废白矿油，废白电油，废火花机油，废甲苯，废切削油，齿轮油，润滑油，废电池机油，锭子油，索拉油，松节油，溶剂油，齿轮油，导轨油等；废化工类：1、废甲苯、废二甲苯、废纯苯2、废丙酮、废丁酮、废环已酮3、废二氯甲烷、废二氯乙烷、废二氯丙烷4、溶剂类： 6#溶油剂， 120#溶油剂， 200#溶油剂5、三氯乙烯，二氯甲烷，三氯乙烷；四氯乙烯，三氯甲烷6、废甲醇、废乙醇、废丁醇、废异丙醇7、废乙二醇、废二甘醇、废三甘醇8、废醋酸丁酯、废醋酸乙酯、废醋酸甲酯9、废乙醚、废乙腈、废石油醚10、清洗类：清洗剂，洗机水，天那水；洗板水，去渍油等废液废水11、废轮胎类供应：特价供应燃料油，非标油，烧火油，废油提练的原油等。

The thermal property studies indicate that the mass loss of compound B was 54.39% at 242.2~750℃, and when the temperature was 1000℃, there was 25.11% char residue left, which showed that the title compound has a good thermal stability and char forming capability. Using acetonitrile as the solvent instead of trichloromethane or 1, 2-dichloethane gave higher yield. During the synthesis, the yield was very low when triethylamine was used as acid acceptor alone, and when a little amount of 4-dimethylaminopyridine was added at the same time, the yield could be 81%.

结果表明，所合成的化合物B的结构与预期的结构一致；热性能研究表明，化合物B在242.2~750℃质量损失为54.39%，1000℃时仍有25.11%的炭残渣，显示出优异的热稳定性和成炭性；在相同反应条件下，用乙腈作为溶剂的反应产率比使用氯仿和二氯乙烷为溶剂的高，并且在合成过程中，单独使用三乙胺作为缚酸剂时产率很低，而当同时加入少量4-二甲氨基吡啶时，产率可达81%。

Acetonitrile-sodium chloride, trichloromethane and acetone-dichloromethane were used to extract organophosphorous pesticides respectively. Pulsed-flame photometer detector was used to analyze the extraction rate of these three solvents. Flame ionization detector was used to analyze the content of impurity in the samples extracted by those three solvents.

分别采用乙腈－氯化钠法、三氯甲烷法和丙酮－二氯甲烷法提取蔬菜样品中残留的有机磷农药，使用带脉冲式火焰光度检测器的气相色谱法比较了三种提取方法有机磷农药的提取效率，使用带火焰离子检测器的气相色谱法分析了三种提取方法杂质溶出量。

The clenbuterol and ractopamine of specimen was extracted by 0.5% tungstenic acid: methanol (80:20). It was then purified by Oasis MCX. The mobile phase was 4 mmol/L ammonium acetate: acetonitrile (80:20). PDA detector was used for separation and detection.

采用0.5%钨酸：甲醉(80：20)提取试样中的盐酸克伦特罗和莱克多巴胺，用Oasis MCX小柱净化，4mmol/L乙酸胺溶液：乙腈(80：20)为流动相，用PDA检测器分离测定。

The result shows that when HPLC adopts 254 nm as scan wavelength, and the mixture of acetonitrile and water according to appropriate proportion as flowing phase, the parameters such as accuracy, repetition and precision et al for the method are all good to satisfy the essential rules of pesticide residue determination.Chapter three is the degradation of Abamectin in soils. The results show:(1) The decomposition of Abamectin is fastest in Aquic Cambosols while slowest in Udic Cambosols in five kinds of different soils.

第三章研究了阿维菌素在土壤中的降解，结果表明：(1)五种不同类型土壤中，阿维菌素在潮湿雏形土中降解最快，而在湿润雏形土中降解最慢；(2)土壤有机质含量与阿维菌素半衰期相关性较强，相关系数为0.9323，而土壤酸碱度、总氮含量、阳离子交换量和田间最大持水量等因子与阿维菌素半衰期相关性较小，说明影响阿维菌素在土壤中降解的最主要因子为有机质含量：(3)土壤有机质、土壤温度和农药浓度等因素对阿维菌素在土壤中的降解有较大影响，此外灭菌条件下其降解半衰期远大于未灭菌时的半衰期，这表明阿维菌素在土壤中的降解可能和土壤微生物有关。

This is the first report of pectenolone and pectenoxanthin, two types of carotenoid, in the muscle of the Yesso scallop.3 Roles of the carotenoids composition and accumulation in Yesso scallopThe method for detecting carotenoids using reverse phase high performance liquid chromatography was developed. The conditions of RP-HPLC analysis were an analytical scale (200×4.6 mm, inner diameter 5μm) Eclipse XDB-C18 column of Agilent corporation; 10μl injection volume; 25°C column temperature; acetonitrile, methanol and methylene dichloride mobile phase (40:56:4, V/VV) with 0.1% BHT; 1.0 ml per minute flow rate; 450 nm UV-VIS detector; 8 minutes elution.The carotenoids from orange muscle of Yesso scallop of 7, 10, 12, 15, 18, 22 months old was detected using the method refered above.

通过柱层析、高效液相等手段对橘红色闭壳肌中的主要类胡萝卜素进行了提取分离，分离提纯得到两种类胡萝卜素，并通过MS、~1H-NMR和~(13)C-NMR对其进行结构鉴定，结果表明(3S，3\'R)-3，3\'-dihydroxy-7\'，8\'-didehydro-β，β-Caroten-4-one和(3S，3\'S)-7，7\'，8，8\'-tetradehydro-β，β-Carotene-3，3\'-diol，俗称pectenolone和pectenoxanthin是橘红色闭壳肌中的主要类胡萝卜素，这是国内外首次对虾夷扇贝闭壳肌中的类胡萝卜素进行提纯及结构鉴定。3虾夷扇贝类胡萝卜素的种类组成和累积变化规律建立了橘红色闭壳肌中类胡萝卜素的HPLC分析定量检测技术：色普柱为Agilent公司的Eclipse XDB-C18柱200mm×4.6mm，i.d.5μm进样体积，5μl ；流速1ml/min；检测波长450nm；柱温25℃；流动相为乙腈：甲醇：二氯甲烷(V/V/V=40：56：4并加入0.1%的BHT；分离时间为8min。

The Reaction of 1, 1-Di-p-methoxyphenyl-2, 2-dinitroethylene and 1, 1-Di-omethoxyphenyl-2, 2-dinitroethylene with BNAH 1, 1-Di (p-methoxyphenyl)-2, 2-dinitroethylene reacts with 1-benzyl-1, 4-dihydronicotinamide in deaerated acetonitrile to give 1, 1-di (p-methoxyphenyl)-2, 2-dinitroethane, while 1, 1-di (o-methoxyphenyl)-2, 2-dinitroethylene fails to react with BNAH under the same conditions.

1，1-二-2，2-二硝基乙烯和1，1-二-2，2-二硝基乙烯与BNAH的反应机理研究

Samples were prepared by protein precipitation with acetonitrile and defatting with n-hexane. The analytes were detected with API 4000 triple quadrupole tandem mass spectrometer equipped with ESI source in the positive ion mode.

猪肉样品中加入乙腈沉淀蛋白，经正己烷脱脂后，采用液相色谱-三重四极杆串联质谱检测，使用电喷雾离子化源，在正离子条件下以多反应监测方式进行扫描。

Now, however, all children continue in "comprehensive" schools, and the eleven-plus determines which courses of study the child will follow.

然而现在，所有的孩子都要在综合学校继续学习，所以这次考试只是决定他们将要学习哪些课程。

Cultivatable land , and led to a general recognition that development must not be carried at the cost of agriculture .

城区的迅速扩大在很多情况下侵占了宝贵的可耕地，使人们普遍认识到发展不能以牺牲农业为代价。