查询词典 acetonitrile

Methods 7 kinds of antibiotics, dexamethasone phosphate disodium salt and salicylic acid were separated on a C18 column using methanol: acetonitrile-aqueous solutions:0.01mol/L oxalic acid=l1:22:67 as the mobile phase at a flow rate of 0.8ml/min, with the column temperature 25℃ and detection wave 240nm and 268nm.

采用C18色谱柱(4.6mm×250mm， 5μm)，以甲醇：乙腈：0.01mol/L草酸＝11：22：67为流动相，流速为0.8ml/min，检测波长为240和268nm，柱温为25℃，在此色谱条件下进行检测。

It is well known that the acetonitrile (CH_3CN) can form stable complex compound with boron halide (BF_3). The sample was complexed in a platinum crucible by acetonenitrile and dissolved by HF: HNO_3 (3:1) solution in a pressure sample dissolver at proper temperature.

基于硼的卤化物(BF_3)能与乙腈(CH_3CN)形成稳定的络合物，将试样置于铂金坩埚内加入乙晴作为络合剂，用HF+HNO_3(3：1)在压力溶样器内加温溶解。

The reaction of polyfluoroalkyl iodides with 4-pentenoic acids in the presence of sodium dithionite at room temperature in aqueous acetonitrile solution [CH〓CN: H〓O=3: 1 ] to gave the corresponding adducts, the latter could form γ-lactones 31～51 in the same medium in 62～92％ yield.

室温下，在乙腈/水[3：1]的介质中，多氟烷基碘化物在连二亚硫酸钠的存在下与4-戊烯酸及其在2或3位上具有取代基团的衍生物进行反应，反应2～5h，起先生成两者的加成物，该加成物无需分离，在同一介质中，可进一步反应得到相应的多氟烷基取代的γ-丁内酯31～51，产率62％～92％。

Results The average recovery of Dracaena's major components reached 80% after precipitated by acetonitrile first and then extracted by ethyl acetate.

结果通过乙腈沉淀蛋白，采用乙酸乙酯进行提取，可使含药血清中龙血竭特征成分的提取率达到80%以上。

Results The average recovery of Dracaena major components reached 80% after precipitated by acetonitrile first and then extracted by ethyl acetate.

结果 通过乙腈沉淀蛋白，采用乙酸乙酯进行提取，可使含药血清中龙血竭特征成分的提取率达到80%以上。

The hydrogenation reaction of acetonitrile catalyzed by Ti modified raney Ni catalyst to prepare ethylamine in liquid phase was studied.

研究了以改性骨架Ni催化剂液相催化乙腈加氢制备乙胺的工艺。

Methods:A YWG-C18 column was used.The mobile phase consist ed of acetonitrile containing 0.2% methanol-water solution containing 0.1% tri ethylamine and 0.1% phosphoric acid(3∶97)and the detection wavelength was 220 nm.

采用高效液相色谱法，色谱柱为YWG-C18柱，流动相为0.2%甲醇的乙腈溶液-含0.1%三乙胺、0.1%磷酸的水溶液(3∶97)，检测波长为220 nm。

By the studies of nanosecond flash photolysis and estimates of excited state energy level, we deduce that there is a charge-transfer excited state corresponding to the transfer of an electron from the zinc porphyrin to the Ru-based moiety of 5-Zn in acetonitrile when exciting at λ= 532 nm.

纳秒闪光光解的研究和激发态的能级估算表明在乙腈溶液中，用波长532nm的激光激发5-Zn，可以形成一个电荷分离态，它对应于锌卟啉到联吡啶钌的电子转移过程，这个电荷分离态表示为：PZn~+-Ru~+。

Methods: Determining paeoniflorin content by high performance liquid chromatography measurement conditions: mobile phase of acetonitrile -0.4% phosphoric acid solution (volume ratio 13∶87; detection wavelength 230 nm; flow rate 1.0 mL/min; and column temperature 25℃; and determining polysaccharide content by anthrone-sulfuric acid method. The extraction procedure of Langchuangling granule was measured, and the evaluated indexes were the rate of dry extra, contents of the paeoniflorin and the total polysaccharide with L9 (34) orthogonal test and preferential treatment of data.

采用高效液相色谱（high performance liquid chromatography，HPLC）法测定芍药苷含量［测定条件：流动相为乙腈-0.4%的磷酸水溶液（体积比为13∶87）；检测波长230 nm；流速1.0 mL/min；柱温25℃］；采用硫酸-蒽酮法测定总多糖含量，并以干浸膏得率、总多糖含量和芍药苷含量为指标，采用L9（34）正交实验，用综合评分法处理数据优选水提取工艺。

The factors included the type of extractant, the amount and the extraction times, the type of purified column, the type and dosage of eluviatant about the pre-treatment of the samples. The extraction was 3 minutes (13500rpm) of high speed homogenize extraction. 50mL acetonitrile as an extractant was acted on one time extraction. The florin silicon column was taken as the purified column. The extraction was eluted by 30ml 3:2 acetone - hexane and concentrated by nitrogen blowing under 50 °C water bath.The chromatographic separated conditions were studied applied the Agilent 6890 gas chromatographic apparatus and DB-17 capillary column(30m×0.25mm×0.25μm).

研究了提取剂种类、用量与提取次数，净化柱种类，淋洗剂种类与用量，提取方式与提取时间，柱温和柱流量等因素对油菜籽中有机磷农药残留提取、分离净化和色谱分离的影响，建立了采用高速匀浆提取方式提取3min13500rpm.min~(-1，以50mL乙腈为提取剂一次提取，以弗罗里硅柱为样品液净化柱，以30mL 3：2丙酮-正己烷为淋洗剂，在50℃水浴条件下用氮吹浓缩，气相色谱检测的油菜籽有机磷农药多种残留检测技术。

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。