查询词典 sodium hydroxide

Samples were saponified with 20 g/L sodium hydroxide. The sexual hormones were then extracted with dichloromethane-acetic acetate (40∶1, v/v) under acidic conditions (pH 3, adjusted with 1 mol/L HCl ). An XTerraTMRP18 column was employed and a mixture of water-methanol-acetonitrile (50∶32∶18, v/v) was used as mobile phase. The seven sexual hormones were detected at 230 nm. The average spiked recoveries for the seven sexual hormones ranged from 75.6% to 97.8% with relative standard deviations of 1.9% to 7.2%. The linear ranges of determination were from 5 to 50 mg/L with correlation coefficients of 0.9999, and the limits of detection were from 3.7 to 12 ng.

先在试样中加入20 g/L氢氧化钠溶液与油脂进行皂化反应，然后用二氯甲烷-乙酸乙酯(体积比为40∶1)混合液在酸性条件下(pH 3)萃取，选择XTerraTMRP18色谱柱，以水-甲醇-乙腈(体积比为50∶32∶18)混合液为流动相，在波长230 nm处检测。7种性激素分离良好并排除了样品中杂质峰的干扰，低、高浓度平均回收率范围为75.6%~97.8%；相对标准偏差为1.9%~7.2%；检出限为3.7~12 ng。

The primary factors influencing the concentration of sodium hydroxide titrating solution were confirmed.

笔者对1mol/L NaOH溶液标定过程中的测量不确定度进行了分析和评定，对同种类型实验进行不

In the second part, we discuss the mechanism and factors of deposit-tion forming. The factors are temperature, rate of titrating the sulphurc acid, rate of stiring, consistency of sulphuric acid and consistency of sodium hydroxide.

接下来本文探讨了沉淀的形成机理和沉淀形成时影响沉淀纯度的因素，并确定了碱减量废水中回收对苯二甲酸的影响因素为温度、加酸速度、搅拌、加入的酸浓度、废水的碱度。

Compared with the time, the impact of temperature factors on the layer thickness is greater. The surface hardness of 45 steel is greatly improved for the exist of FeB; the corrosion resistance of boronizing layer is excellent which can resist hydrochloric acid, sulfuric acid and sodium hydroxide.

相比而言，温度对渗硼层厚度的影响大于时间的影响；渗硼层中FeB相使表面硬度显著提高；渗硼层抗盐酸、硫酸、氢氧化钠腐蚀性优良。

A yield of 88% for TMH can be obtained by using the optimized synthetic conditions as follows: molar ratio of formaldehyde to octylaldehyde 4.5: 1.0, molar ratio of sodium hydroxide to octylaldehyde 1.4: 1.0, aldol condensation temperature 35℃ and time 240min Cannizzaro reaction temperature 55℃ and time 180min.

结果表明，优化的合成三羟甲基庚烷的反应条件是，n／n=4.5，n/n=1.4，羟醛缩合反应温度和时间分别为35℃和240min，康尼扎罗反应温度和时间分别为55℃和180min，摩尔产率可达88%。

Trimethylolheptane was synthesized through consecutive aldol condensation and Cannizzaro reaction of octylaldehyde and formaldehyde, using sodium hydroxide as catalyst.

为制备新型芳香缓释聚氨酯微胶囊合成了两亲性单体三羟甲基庚烷。以氢氧化钠为催化剂，辛醛和甲醛在较低温度下发生羟醛缩合反应生成2，2-二羟甲基辛醛。

Viscose manufacturing process involves the reaction of cellulose with sodium hydroxide to form an alkali cellulose.

粘胶的生产过程包括纤维素与氢氧化钠反应形成碱纤维素的过程。

Treatment of purified wood pulp with 18% sodium hydroxide solution produces alkali cellulose.

用18%氢氧化钠溶液处理纯化木浆生产出碱性纤维素。

HPMC is prepared when a purified form of cellulose is reacted with sodium hydroxide solution to produce a swollen alkali cellulose that is chemically more reactive than untreated cellulose.

当被净化的纤维素与氢氧化纳溶液反应产生一种膨胀碱性纤维素时，HPMC就产生了，这种纤维素在化学上比没有经过处理的纤维素更易起反应。

After groping , reaches the best saponification technology condition: the saponification time is 4hours, the saponification temperature is 100 C, the ratio of alkali number consumed and the Waste edible oils quality is 1: 2, and the density of sodium hydroxide is 30%.

摸索出最佳皂化工艺条件：皂化时间4小时，皂化温度100℃，碱液用量(NaOH与废油脂的质量比)1：2，皂化用NaOH碱液浓度为30％。

What would he tell Judith and the children?

他将怎样告诉朱迪丝和孩子们呢？

I this is at that time, the opinion with peacockish true girl is full of in a heart.

这就是当时的我，一个心中布满虚荣的女孩子真实的想法。