二钠

The influence of each condition on the reaction speed and yield was studied, and the optimal conditions were: the ratio of the amount of substance of aromatic amine and heptafluoro-isopropyl iodine was 1:1.1~1.5, the amount of substance of sodium dithionite, sodium bicarbonate, aniline compounds were respectively 1.1~1.3, the amount of substance of phase transfer catalyst TBAB and aniline compounds was 0.05~0.1, the concentration of aniline compound was 0.5~1.0 mol/L, reaction temperature was 10~20 ℃, and the solvent was aether.

最佳结果为：芳胺与七氟异丙基碘的物质的量比1：1.1~1.5，连二亚硫酸钠、碳酸氢钠与苯胺的物质的量分别为1.1~1.3，相转移催化剂四丁基溴化铵与苯胺的物质的量比在0.05~0.1，溶剂总用量使苯胺浓度在0.5~1.0 mol/L；反应温度10~20℃；溶剂采用乙醚。取代基供电子性越强，反应时间越短，产率越高；氨基的对位优先反应，氨基的邻位较难发生反应；且七氟异丙基总是优先取代在芳环电子云密度较高的位置上。

The changes of total reducing substances, oxalate extractable Fe, dithionite citrate bicarbonate extractable Fe and phosphorus adsorption in oxic and anoxic layers of two paddy soils during 6 week flooding were examined under laboratory conditions.

在实验室条件下对两种水稻土在为期 6周的淹水过程中，其氧化层和还原层土壤中还原物质总量、草酸盐可提取铁、连二亚硫酸钠-柠檬酸-碳酸氢钠可提取铁和磷吸附的变化进行了研究。

A copolymer emulsion used for air filter paper impregnation was studied, the emulsion was prepared by copolymerization of styrence/bulyl acryl ate and oxidized starch using sodium bisulphate/potassium per sulfate as initiator and sodium doddery sulfate as emulsifier.

摘 要：采用半连续乳液聚合的方法，以亚硫酸氢钠-过硫酸钾为引发剂，十二烷基硫酸钠为乳化剂，合成了一种以氧化淀粉、苯乙烯和丙烯酸丁酯为主要原料的空气滤清器滤纸浸渍乳液。

It can be presumed that acting point of salicylic acid is possible before oxidation of taxa-diene exocycle double bond.

因而推测柠檬酸钠的作用位点很可能在紫杉二烯环外双键氧化之前。

The missing link, he adds,"is whether the sodium in the E-ring particles really came from Enceladus."

而最后，这些固态的钠元素将重新和土卫二的喷发物融合在一起并继续存在于土星E环中。

Nutrition information Serving size:38.8g in 20ml of water Serves per can:23 Prepared food Avg Qty Per Serve % Daily intake per serve Avg qty per 100ml Major nutrients Energy Protein Carbohydrate -sugars -lactose -dextrose -sucrose -unavailable CHO Dietary Fibre -FOS Sodium Fats Fats-total -Saturated -Trans -Monounsaturated -Polyunsaturated -Total Omega3 -ALAa -VLC Omega3 -DHAb -EPAct -DPAdt Vitamins and minerals Vitamin A Vitamin D3 Vitamin E Thiamin (B1) Riboflavin (B2) Vitamin B6 Vitamin B12# Niacin (B3) Folic Acid Vitamin C Calcium Iodine Iron Phosphorous Magnesium Zinc

营养信息服务大小： 38.8克在二〇毫升水每次可以提供： 23 准备食物数量平均每个服务％，每日摄入量每服务平均数量每100毫升主要营养素能源蛋白质碳水化合物-糖乳糖一葡萄糖蔗糖，无法町膳食纤维- fos基因钠油脂油脂总饱和反，单，多总计Omega3 ，阿拉，可变长编码Omega3 - DHAb - EPAct - DPAdt 维生素和矿物质维生素A 维生素D3 维生素E 硫胺素（ B1 ）核黄素（素B2 ）维生素B6 维生素B12 ＃烟酸（ B3的）叶酸维生素C钙碘铁磷镁锌

Two triphase catalysts of comb-like polyether s supported by silicas were synthesized,and their catalytic behavior in the iodo-substitution,etherization and the addition reaction of dichlorocarbene to styrene were also studied.

以表面经偶联剂修饰的二氧化硅为载体，通过聚(β-氯乙基缩水甘油醚)和醇钠反应，合成了两种梳状聚醚三相转移催化剂，研究了它们在碘代、二氯卡宾对双键加成和混合醚制备反应中的催化活性。

Sodium salt of ethylenediamine tetraacetic acid and glycine）.

乙二胺四醋酸和甘氨酸的钠盐。

The globe kinetics model can be described by an exponential equation, which was fitted very well with experiment data and the error was within 7%.

结果表明，当初始pH值为7.5、反应时间为120min时，质量浓度为25mg/L的表面活性剂十二烷基苯磺酸钠的去除率为97％，且DBS降解的反应动力学模型可用幂指数方程描述，该模型计算值与试验值吻合较好，误差在7％以内。

This paper put forward three ways: Oxidation-reduction titration, ferruginous spectrophotometry, and direct spectrophotometry. Every way is applied in PH fit for itself. Every way should pay attention to some ways.

本论文确定高铁酸钾的三种定量分析方法：亚砷酸钠氧化还原滴定法、邻二氮杂菲分光光度法、直接分光光度法，并明确了每种方法的适用PH值范围和应遵守的相应注意事项。

Shop assistant: Please check at the door.

店员：请您到门口柜台交费。

In the end, transportation of PAHs in the environmental matrix was preliminarily investigated and discussed according to PAHs data of soils and sediments from a certain region in Shanghai. The result indicated that there are two or more pathways on PAHs transportation in the environmental matrix.

最后，对上海特定地区内PAHs在环境介质中的迁移径途进行了分析讨论，结果表明上海市土壤和沉积物等环境介质中PAHs的迁移存在多种途径。