萃取

It,s allelchemicals were isolated through extraction, thin-layer chromatography, and column chromatograpathy. After the white clover was infused in ethanol and evaporation, the leavings was dissolved by water. The aqueous extract was extracted by petroleum,chloroform, ethyl acetate and n-Butanol successively, and the bioassay showed that the chloroform phase has obvious inhibitory effect, the inhibitory rate was 44.32%,88.08% on Abutilon theophrasti M., seedling length and root length, 82.08%,92.16% on Echinochloa crusgalli L., seedling length and root length, and the Amaranthus retroflexux L., germination rate is 0, the secondly was ethyl acetate phase.

运用萃取、薄层层析、柱层析等方法对白三叶草地上部分的化感物质进行初步分离，结果表明，白三叶草经乙醇浸提旋转蒸发后用蒸馏水溶解，依次用石油醚、氯仿、乙酸乙酯、正丁醇萃取，生物测定表明氯仿组分对杂草的抑制作用最强，对苘麻芽长和根长抑制率分别为44.32%、88.08%，对稗草芽长和根长的抑制率分别为82.08%、92.16%，反枝苋的发芽率为0；其次是乙酸乙酯相。

Methods Using acetamide as the internal standard,extraction column and extraction conditions of fluoroacetamide from blood and urine samples were optimized by comparing the extraction efficiency of different solid-phase extraction columns and the effects of experimental conditions on recovery.

选择乙酰胺为内标，通过比较不同固相柱的萃取效率和不同条件对回收率的影响，优化用于血和尿样中氟乙酰胺萃取的固相柱和提取条件，利用氟乙酰胺与乙酰胺质谱图的分子离子峰面积之比与氟乙酰胺浓度的定量关系，建立血和尿样中氟乙酰胺鼠药的GC/MS定量分析新方法。

The extraction behaviors of actinides and the main fission products by the above compounds were studied.

较为系统研究了该化合物作为锕系元素萃取剂对锕系元素和主要裂片元素的萃取性能。

The research progress on SFCE of lanthanides and actinides and applications in the process study of spent fuel reproc.

文章主要介绍超临界流体的特点、超临界流体络合萃取的基本原理及其影响因素，并对超临界流体络合萃取镧系和锕系元素的研究进展及其在乏燃料后处理工艺研究中的应用进行综述。

N,N,N',N'-tetrabutyl-3-oxa-pentanediamide presents excellent extraction abilities for actinides elements. The effects of hydrolysis and radiation on extraction behavior of U with TBOPDA have been investigated.

N，N，N'，N'四丁基 3 氧戊二酰胺对锕系元素具有良好的萃取性能，为了考察TBOPDA稳定性，研究了温度、酸度和吸收剂量对TBOPDA萃取性能的影响。

In this paper, in order to solve the FAAS determination of alkaline earth metal in a lower sensitivity of the issue have been introduced by a sense of its flotation.

本文初步试验了十八冠-苦味酸体系对锶萃取的影响，结果在各种条件下均不能取得较好的萃取效果。

It is existed competitiveness inhibition of 6APA, non-competitiveness inhibition of PAA and substrate inhibition of Penicillin on the hydrolysis of benzylpenicillin to 6APA and PAA by an immobilized penicillin amidase. The heat conductive coefficients were determined on the vacuum elevation liquid membrane concentration. The thermodynamics and kinetics of PAA extraction were studied on the organic solvent extraction of the above solution.

研究证明固定化青霉素酰化酶裂解反应是典型的底物、产物抑制酶反应，其反应动力学数据表明，青霉素、苯乙酸以及6APA对反应分别存在底物抑制、非竞争性抑制和竞争性抑制；真空升膜浓缩适应热敏性以及粘度不大的物系，对于6APA水溶液的真空升膜浓缩过程研究得到了浓缩实验的传热系数；浓缩液萃取主要是提取出其中的苯乙酸，本文测定了不同温度以及溶剂条件下的苯乙酸溶解度，并观测了苯乙酸萃取动力学。

Effect of acidity of aqueous phase and different ammoniation rates of extractant on the total mass transfer coefficients based on the water phase have been investigated The results showed that the mass transfer coefficients of Zn and Cd decreased but that of rare earth increased with the increasing of the ammoniated rate of extractant.

考察了料液酸度、萃取剂浓度以及萃取剂不同氨化度对锌、镉传质系数的影响。

The synergistic extraction of uranyl nitrate with binary system of 1-phenyl-3-methyl-4-benzoyl-pyrazolone-5 and tributyl phosphate or diphenyl sulfoxide, and ternary system of PMBP-DPSO-TBP were studied.

本文研究了1-苯基3-甲基4-苯甲酰吡唑酮-5与磷酸三丁酯或二苯亚砜的苯溶液从硝酸介质中对U的萃取，实验发现有显著的二元协萃效应，并测定了二元协萃络合物的组成为 UO_2A_2·TBP或 UO_2A_2·DPSO，求得二元协萃平衡常数为1gβ_(12)=3.58，1gβ_(13)=3.61。

The ore is molien with sodium peroxide and the molten sample is leached with triethenol amine and sodium citrate.

本法采用过氧化钠熔矿、三乙醇胺和柠檬酸钠浸取，在弱酸介质中，以PMBP-苯萃取，甲酸反萃取。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失