乙腈

The ultrasonic-assisted solvent extraction and quantitative analysis of the oxine-copper residues in soil with ion pair of antiphase HPLC was established. This methods mainly uses XBridge C5 column and UV detector by using waters phase of phosphatic buffered solution/acetonitrile (60:40, by vol) as mobile phase with 0.8 mL/min flow ratio and UV detection at 245 nm. The residue time was 4.72 minute. The linear correlation of this method was 0.9987. The recovery rate was 76.2 to 108.7%. Comparatively standard deviation was 0.6 to 3.37%. The detection limits of method was 0.05 mg/kg.

建立了土壤中喹啉铜的超声波辅助溶剂提取－反相离子对高效液相色谱法的残留分析方法，该方法使用XBridge C18色谱柱和可变波长紫外检测器，并以水相磷酸盐缓冲体系－乙腈（体积比60：40）作流动相；流速为0.8mL/min；检测波长为245nm；保留时间为4.72min；线性相关系数为0.9987，回收率在76.2%~108.7%之间，相对标准偏差在0.6%~3.37%之间，对土壤的最低检出限为0.05mg/kg。

Part one we reviewed the synthesis of α-substituted aryl acetonitriles catalyzed by phase transfer catalysis.

第一部分综述了合成α-取代芳香乙腈的相转移催化反应的研究。

A Cu-promoted ring-closed reaction of di-pyridylketone azine was developed in the design of a fluorescent chemodosimeter for potential selective Cudetection.

晶体结构和光谱分析表明，在DPKA的乙腈/水混合溶剂中，引入铜离子可以促使苯并三氮唑类荧光化合物(2)的形成，该反应可以使得溶液的荧光明显增强。

The HPLC finger print of TGDGBX was set up by HPLC-DAD: the chromatographic column,Diamonsil C18(250 mm×4.6 mm, 5μm, 30℃)and bidimensional gradient elution using methyl cyanide-water (flowing speed 1.0 mL·min-1,λ=203 nm). 180 Wistar rats were randomly divided into normal control group, model group, cortisone group, and TGDGBX (16,32 and 64 mg·kg-1) groups respectively.

采用HPLC-DAD，Diamonsil C18色谱柱(250 mm×4.6 mm， 5μm)，乙腈―水二元梯度洗脱，流速1.0 mL·min-1，(λ=203 nm)，柱温为30℃，建立了当归补血总苷的HPLC指纹图谱。180只Wistar大鼠随机分为正常对照组、模型对照组、强的松组和当归补血总苷大、中、小剂量组，每组30只。

The leakage and treatment of solvent desorber in a butadiene unit of organic synthesis plant are introduced.

摘要介绍了某石化公司乙腈法抽提丁二烯装置的一次溶剂解吸塔泄漏情况和处理过程。

The ratios of mobile phase (methanol∶acetonitrile∶1% formic acid, pH3.0) were 10∶15∶75, 10∶10∶80, 6∶6∶88 for lettuce, celery and pakchoi cabbage, respectively.

生菜、芹菜和小白菜样品选用的流动相（甲醇∶乙腈∶1%甲酸，pH3.0）体积比分别为10∶15∶75，10∶10∶80，6∶6∶88。

As in the case of benzene-acetonitriles, chemisorption is probably the mechanism of the corrosion-inhibiting effects.

我们曾对苯乙腈类化合物的分子结构与缓蚀性能的关系作过一些探讨。

Methods: red sage root,astragalus root,white peony root,corydalis tuber,fevervine herb,dahongpao,chinese gall,cinnamon bark in this preparation were identified by tlc;the content of paeoniflorin in this preparation were determined by hplc, agilent zorbax sb 4.6×150 mm,rp-18e（ 5μm） was used. the mobile phase consisted of acetonitril-water ( 15:85 ), the velocity of flow was 1.00 ml.min-1.the detection wavelength was 230 nm.

采用tlc法鉴别处方中丹参、黄芪、白芍、延胡索、鸡屎藤、大红袍、五倍子、肉桂等药材；采用hplc法测定处方芍药苷含量，agilent zorbax sb 4.6×150 mm，rp-18e（ 5 μm ）色谱柱，流动相为乙腈-水（ 15∶85 ），流速1.00 ml.min-1，检测波长230 nm。

The diffusion coefficient of heptachloropyridine in...

求得3，4，5，6-四氯-2-三氯甲基吡啶在乙腈和水的混合溶液(体积比5∶1)中的扩散系数D=3.0 10-5cm2/s。

The processes for preparation of tribenuron-methyl and its key intermediates were reviewed. Comparing the yield, quality, cost, safety and environmental protection and other aspects, the best production process of tribenuron-methyl is to use the methyl 2-benzoate and sodium cyanate as raw materials.

综述了苯磺隆及其关键中间体的主要生产工艺，并对各生产工艺在收率、质量、成本、安全环保等方面进行了比较和评价，指出了以邻甲酸甲酯苯磺酰氯、乙腈和氰酸钠为原料的工艺是苯磺隆的最佳生产工艺。

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。