查询词典 acid reaction

A new fluotescence quenching method has been developed to determine nitrite in water samples. The method is based on the diazo-reaction between nitrite ion and thionine in dilute suifuric acid medium.

文章研究了在稀硫酸介质中亚硝酸根与硫堇发生的重氮化反应，基于硫堇的荧光强度随亚硝酸根的加入量增加而明显降低的现象，建立了荧光猝灭法测定痕量亚硝酸根的新方法。

Bromoxynil octanoate was synthesized from bromoxynil, octanoic acid and thionyl chloride in the solvent using DMF and N(C 2H 5) 3 as catalysts by one step reaction.

以DMF、三乙胺为催化剂，在溶剂中，用辛酸直接合成了溴苯腈辛酸酯，实现由酸合成酯的一步反应。

Methods After extracting the samples, the reaction between thymol and nitrate produced nitrothymol in the presence of sulphuric acid; then nitrothymol was made to react with sodium hydroxide; determination was made on the concentration of nitrate by spectrophotometry at 412 nm.

样品经提取，其中的硝酸盐在硫酸酸性条件下，与麝香草酚生成硝基化合物，再与氢氧化钠作用，生成黄色化合物，在波长412nm处用分光光度法测定食品中硝酸盐含量。

Peroxo titanic acid sol; needle-like anatase crystal sol; nano TiO2 thin films; hydrothermal reaction; photocatalysis

过氧钛酸溶胶，针状锐钛矿晶粒溶胶，纳米TiO2薄膜，水热反应，光催化

With the acid and alkali titrate method,we got the mean molecular weight and discussed the monomer density,the initiator amount used, chain transfer agent factor as well as reaction temperature to molecular weight influence tendency and d.

聚丙烯酸钠在很多领域的广泛应用，我们采用水溶液聚合法中的中和法合成低分子量聚丙烯酸钠，用酸碱滴定的方法测得聚丙烯酸的平均分子量，并探讨了单体浓度、引发剂用量、链转移剂用量以及反应温度等因素对聚丙烯酸钠分子量的影响趋势和程度。

Methods: Glipizide gliclazide glyburide glimepiride gliquidone repaglinide nateglinide pioglitazone rosiglitazone metformin phenformin and tolbutamide added in the blank ground samples were extracted with 80% methanol and were separated from an ACQUITY UPLC DBH C18 column with a gradient mobile phase of acetonitrile - 0.2 % formic acid water solution. A tandem quadrupole mass spectrometer equipped with electrospray ionization source was used in positive ion mode multiple reaction monitoring was performed to quantify above mentioned compounds.

被添加在中成药制剂及其包装物中的二甲双胍、苯乙双胍、罗格列酮、吡格列酮、格列吡嗫娶瑞格列奈、甲苯磺丁脲、格列齐特、格列苯脲、那格列奈、格列美脲、格列喹酮等西药成分用80%甲醇提取，以乙腈- 0.2%甲酸水溶液为流动相梯度洗脱，在ACQUITY UPLC DBH C18色谱柱上分离，串联四级杆质谱检测，MRM方式采集并定量。

The optimum conditions were obtained: reaction time 10 h, amount of catalyst for the quality of glycerin 5%, molar ratio of glycerin to acetic acid 1:8, under which the yield of glycerol triacetate reached 93.8%.

实验结果表明，反应时间10h，催化剂用量为甘油的5%，甘油／乙酸=1：8的条件下，三醋酸甘油酯的收率达93.8%。100~130℃时，反应活化能为113.245kJ/mol。

And the acid-induced cross-linking reaction of phenol-aldehyde resin/hexamethaoxy methyl triazine has also been tested successfully.

对所研究生酸体系引发酚醛树脂/六甲氧基甲基三聚氰胺交联反应的能力进行了初步研究。

The oleoyl chloride was prepared by the reaction of phosphorus trichloride and oleic acid.

通过油酸和三氯化磷反应制备了油酰氯，再用油酰氯与谷氨酸单钠盐反应制备了目标产物油酰-L-谷氨酸。

However, when reaction time is fixed, this system can follow Lambert-Beer Law within visible spectrum. Furthermore, it can not be affected by temperature. Based on these findings, CTAB Turbidness Method, a quick method to determine hyaluronic acid contents in fermentation broth is established.

研究表明，随着反应时间延长，反应体系的吸光度逐渐升高，但当反应时间固定后，在可见光区反应体系能较好的遵循朗伯－彼尔定律，并且不受温度的影响。

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。