查询词典 potassium amide

As it is not part of any organic compound, potassium is highly mobile and is preferentially transported to young meristematic tissue.

由于钾不是任何有机化合物的组成成分，它极易迁移，并且优先向幼嫩的分生组织转移。

Water glass, also known as sodium silicate chemically, is a type of metasilicate water solution. It will be known as Potash Water Glass if potassium metasilicate is used commonly.

水玻璃俗称泡花碱，是一种矽酸盐水溶液，常用的是矽酸钾，称为钾水玻璃。

In alkali metasomatic rocks, potassium is in reverse correlation with gold; and sodium is in reverse correlation with uranium, it is very important to ore-formation of uranium and gold.

研究中还认识到，在碱交代作用形成的碱交代岩中，钾与金负相关，钠与铀负相关，这对铀、金成矿有着重要的意义。

The direct synthesis of dimethyl carbonate from methanol and carbon dioxide using another basic catalyst, potassium methoxide in the presence of CH〓I as a promoter was investigated.

除了用甲醇于二氧化碳合成DMC以外，我们又对以甲醇与尿素为原料合成DMC的路线进行了尝试，筛选出了两个离子液体Et〓NHCl-FeCl〓和emimBr-ZnCl〓作为用甲醇与尿素为原料合成DMC的高效催化剂，研究了各种反应条件如原料的比例、催化剂的添加量、反应的温度等对反应的影响，得到了所报道的在间歇釜中经一步反应合成DMC的最高产率（27％和26％左右）。

Secondly, the silver based catalysts modified by phosphorus, zirconium, zinc, potassium and so on using molecular sieve as carrier, which were produced by ion-exchange method, had also good catalytic performance for 1,2-propane glycol oxidation to methylglyoxal. The conversion of 1,2-propane glycol and the selectivity of methylglyoxal were both high, and the impurity such as formaldehyde and acetaldehyde in the product is little. At the condition of the temperature 300 ℃, the molar ratio of oxygen to 1,2-propane glycol 1.7:1, the space velocity 6000h~(-1), and the concentration of 1,2-propane glycol 70wt%, the conversion of 1,2-propane glycol is 90% and the selectivity of methylglyoxal is 45% on the Ag-P catalyst.

其次对采用离子交换法制备的负载在分子筛上的银系催化剂进行了研究，发现此催化剂在助催化剂磷、锆、锌、钾等的作用下对丙二醇的低温氧化脱氢具有很高的活性，可以得到较好的丙酮醛的收率，并且产物中的甲醛、乙醛副产物的量比较低；经过对Ag-P催化剂上反应条件的考察，发现当温度为300℃、氧醇比1.7：1、空速6000h~(-1)、丙二醇浓度为70wt%时，丙二醇的转化率为90%，丙酮醛的选择性为45%。

The chemical analysis of N, P and K in organic fertilizer is presented: sample is decomposed by sulfuric acid-hydrogen peroxide and prepared to be a solution. N can be determined by NC-2 model quick N analysis set, P by chinoline molybdic acid method and K by tetraphenylboron potassium, needless of spectral photometer and flame photometer, the method is available when the content of N, P or K is over 0.1% with desired accuracy and precision.

介绍用化学分析方法测定有机肥料氮、磷、钾的含量，即样品经硫酸-过氧化氢消化后，制备待测溶液，分取待测溶液用NC-2型快速定氮仪测定氮，用磷钼酸喹啉重量法测定磷，用四苯硼酸钾重量法测定钾，不需使用分光光度计和火焰光度计，适宜一般复混肥料厂采用，对含氮、磷、钾分别达0.1％以上的样品均可用本法测定，方法的准确度和精密度能满足生产的要求。

In order to make WRCRFs with good performance, the raw material fertilizers with smaller effects on HWAR such as urea, monoammonium phosphate and potassium chloride should be selected. On the other hand, for HWAR, high stability and adequate WAR such as polyacry lamide graft polymer should be needed.

制造性能优越的保水型控释肥，应尽可能选择对HWAR稳定性影响较小的尿素、磷酸一铵、氯化钾等原料肥料，对于包膜材料则应选择稳定性高且具适度吸水倍率的聚丙烯酰胺型HWAR。

Stock Solution— Dissolve 34 g of monobasic potassium phosphate in about 500 mL of water contained in a 1000-mL volumetric flask.

贮备液：将34g磷酸二氢钾在1000mL容量瓶中溶解于约500mL水中。

Methods The HPLC was performed on Lichrospher C18 (200 mm × 4.6 mm, 5μm) column. The mobile phase consisted of methanol and 0.02 molL^(-1) monobasic potassium phosphate buffer (60:40). The flow rate was 1.0 mlmin^(-1). The detection wavelength was set at 333 nm.

以汉邦Lichrospher C18 (200 mm×4.6 mm，5μm)为色谱柱，以甲醇-0.02 molL^(-1)磷酸二氢钾溶液（用磷酸调节pH值至4.2）60：40）为流动相，UV检测波长333 nm，流速1.0mlmin^

Methods: The HPLC with a C18 column (150mm×4.6mm, 5μm) was used. Methanol-0.05mol/L Potassium phosphate monobasic buffer solution-Acetic acid glacial (40:60:1) was used as mobile phase. The flow rate was 1.0mL/min, and the detection wavelength was at 333nm.

采用高效液相色谱法，用C18色谱柱(150mm×4.6mm， 5μm)，以甲醇-0.05mol/L磷酸二氢钾溶液-冰乙酸(40：60：1)为流动相，流速为1.0mL/min，检测波长333nm。

However it can often be frust ating for a child when people are unable to pronounce their name.

但它往往可以令人沮丧的一个孩子当人们无法断言他们的名字。

All these compounds were obtained from this genus for the first time. Compound, 4-cumylphenol, was a new nature product.

所有化合物均为首次从本属海藻中分离得到，其中4cumylphenol为新天然产物。