查询词典 acid-base

Diammonium phosphate,NKP compound fertilizer,granular superphosphate,titanium dioxide,sodium silicofluoride,potassium silicofluoride,phenyl Peri acid,Peri acid,Laurent's acid,antioxidant,pyrite.

提供产品：磷酸二铵、NPK复合肥、造粒磷肥、钛白粉、氟硅酸钠、氟硅酸钾、苯基周位酸、周位酸、劳伦酸、橡胶防老剂、硫铁矿。

The yield of conversion and reaction rate were investigated under different reaction temperature, reactant ratio and catalyst amount through conditional experiment, and best conditions were confirmed, which was 75℃, the ratio of 1:4 for binary acid to ethanol and the amount of silicotungstic acid was 2% of mixing binary acid quality.

通过条件试验，分别考察了在不同的温度、投料比、催化剂用量情况下酯化反应的转化率和反应速率，最终确定了该反应的最佳反应条件：温度75℃，酸醇比为1：4，催化剂用量为混合二元酸质量的2%。

The results show high selectivity when the temperature is controlled at 50 CC , and the nitrated reaction time is 90 mm, toluene is nitrated by using 95% nitric acid as nitrating reagent at the presence of acetic anhydride, 1.0g silicotungstic acid catalyst is calcinated at 300℃ for 1.5h. The o/p (ratio of ortho to paro isomer of toluene nitration) ratio is 0.89 in product distribution of toluene nitration, lower than 1.67 using sulfonitric acid as catalyst. The yield of products is 91.6%.

结果表明，在醋酐存在条件下，以CCl4为溶剂，以质量分数为95%的硝酸为硝化剂，反应温度控制在50℃，反应60 min， 1.0g经300℃焙烧1.5h后的硅钨酸催化剂，对甲苯表现出强的区城选择性，甲苯硝化产物o/p值（甲苯硝化产物邻位和对位异构体的质量比）达0.89，较硝硫混酸的1.67显著降低，产物收率达到91.6%。

These results indicate that cabbage phenolic extract and single phenolic acids,i.e.Ferulic acid,Sinapinic acid and Gallic acid,etc.

研究表明，卷心菜提取物以及单个酚酸（儿茶素、阿魏酸和香豆酸）可以抑制〓、〓—7，8—二氢二醇和四氯化碳在肝微粒体作用下的代谢，降低主要代谢产物〓—7，8—二氢二醇、〓—7，8—二氢二醇—9，10一环氧化物和丙二醛的生成量。

Acid is formed under acidic conditions, it has antibiotic action, weaker than sorbic acid and stronger than acetic acid.

在酸性条件下产生丙酸，具有抗菌作用，比山梨酸弱，比乙酸强。

To develop a solid phase extraction- high performance liquid chromatography method for determination of dehydroacetic acid,benzoic acid,sorbic acid in cake and pastry.

建立了固相萃取-高效液相色谱法测定糕点中的脱氢乙酸、苯甲酸、山梨酸的方法。

The glycyrrhizic acid antigen is prepared through the process including following steps: dissolving glycyrrhizic acid in N, N-dimethyl formamide, dioxane or dimethyl sulfoxide, heliophobically adding N-hydroxy succinimide, reacting with dicyclohexylcarbodiimide at 0-10 deg.c for 2-5 hr; and reacting with carrier protein at normal temperature for 4-6 hr to obtain glycyrrhizic acid antigen.

本发明所提供的甘草酸抗体，是用甘草酸抗原免疫动物，然后从被免疫动物的血清中分离得到的；所述甘草酸抗原按如下过程制备：先将甘草酸溶解在N，N-二甲基甲酰胺、二氧六环或二甲基亚砜中，避光加入N-羟基琥珀酰亚胺，然后在0-10℃条件下与二环己基碳二亚胺反应2-5小时；接着与载体蛋白常温反应4-6小时，得到甘草酸抗原。

A good linear relationship could be obtained in the concentrations ranged from 1.6 to 175 mg/L for sulfamic acid and from 3.2 to 175 mg/L for DL-malic acid. The detection limits of each acid were 0.4 mg/L and 0.8 mg/L, respectively.

两者的线性范围分别为1.6~175mg/L和3.2~175mg/L；检出限分别为0.4mg/L和0.8mg/L；相对标准偏差分别小于1.1%和0.9%(n=9)；氨基磺酸的加标回收率在97%~103%之间，DL-苹果酸的加标回收率在93%~105%之间。

Our company specializes in operating plating materials: sulfamic acid nickel, nickel sulphate, nickel chloride, nickel carbonate, etc.; environmentally friendly sewage treatment materials: polyacrylamide, polypropylene acid sodium, ferrous sulfate, etc.; washing cleaning materials: OP - 10, TX-10, NP-9, K-12, JFC, sodium carboxymethyl cellulose, etc.; cosmetic raw materials: Triclosan, Resorcinol, stearic acid and so on, basic chemical raw materials: Industrial salt, soda ash industrial ammonium chloride, ammonium chloride agriculture, Sodium Sulfate, Sodium Molybdate, Ammonium Molybdate, as well as chemical products such as UV-absorbers.

本公司专业经营电镀原料：氨基磺酸镍，硫酸镍，氯化镍，碳酸镍等；环保污水处理原料：聚丙烯酰胺，聚丙烯酰钠，硫酸亚铁等；洗涤清洗原料：OP-10，TX-10，NP-9，K-12，JFC，羧甲基纤维素钠等；化妆品原料：三氯生，间苯二酚，硬脂酸等，基础化工原料：工业盐，纯碱，工业氯化铵，农业氯化铵，元明粉，钼酸钠，钼酸铵等以及紫外线吸收剂等化工产品。

Butyl p-hydroxybenzoate was synthesized from p-hydroxybenzoic acid and butanol with sulfoacid resin as catalyst. The optimum conditions were as follow: ratio of n-butanol, p-hydroxybenzoic acid and sulfonic acid resin was 0.25 mol ∶ 0.05 mol ∶ 1.5 g, refluxing for 5 h using water separator at the reflow reaction temperature.

摘 要：以对羟基苯甲酸和丁醇为原料，用磺酸树脂作催化剂，催化合成了尼泊金丁酯，优化反应条件为：n∶ n=5 ∶ 1，催化剂磺酸树脂的用量为对羟基苯甲酸质量的21%，反应温度为回流温度，反应时间为5 h。

Fancy gold-plated dangling earrings with facetted White Opal crystals.

花式镀金悬垂耳环与facetted白欧泊水晶。

This essay chooses the study aim from biology teachers in middle school in Shi Jiazhuang which tells us that most of the middle school biology teachers in Shi Jiazhuang have the"burnout", lower successfulness, individualize.

本文选取石家庄市初中生物教师作为研究对象，运用问卷调查的方法对石家庄市初中生物教师职业倦怠的现状进行调查，调查结果发现，石家庄市初中生物教师这一群体普遍存在职业倦怠，情感枯竭程度偏高，成就感偏低，去个性化程度最为严重。