萃取

The best extraction parameters are confirmed. The extraction temperature is 30℃, the extraction time is 20min, the extraction ratio is 4:1, and the extraction solution is alkalescency.

通过实验，确定了理论上最佳的萃取工艺条件：萃取温度30℃、萃取时间20min、萃取比4∶1、保持废水在碱性条件下萃取。

In order to optimize technological parameters of arecoline extraction from areca nut using supercritical carbon dioxide extraction technique, the effects of extraction temperature, extraction pressure and extraction time on arecoline extraction were explored by second-order regression general rotation design.

为了优化超临界CO2萃取槟榔碱的工艺参数，通过三元二次通用旋转组合设计实施试验，考察了萃取温度、萃取压力和萃取时间因素对槟榔碱萃取量的影响。

Hydroxylamine hydrochloride (NH2OH·HCl) was selected to extract manganese oxides, and sodium dithionite (Na2S2O4) was used to separate manganese oxides and iron oxides. Optimum extraction conditions were determined by changing each of the experimental condition.

参考人工培养生物膜的萃取方法，分别用NH2OH·HCl和Na2S2O4为萃取剂选择性萃取生物膜上的锰氧化物和铁、锰氧化物，通过改变各萃取条件，考察萃取效果，确定最佳条件。

The PPESK stir bar was proved to show one order of magnitude higher extraction capacity than the corresponding PPESK fiber and two orders of magnitude higher extraction efficiency than PDMS stir bar.

对于硝基苯类爆炸物， PPESK固态萃取搅拌棒的萃取容量比萃取纤维针提高1个数量级以上；其萃取效率比PDMS固态萃取搅拌棒高2个数量级。

Supercritical fluid extraction technique was used to extract orris oil from the orris and,then,the chemical composition of the product extracted from the orris by means of GC-MC was analyzed.

采用超临界流体萃取技术从鸢尾中萃取鸢尾油，再利用GC MS对鸢尾超临界CO2萃取产物的化学成分进行成分分析，鉴定了鸢尾超临界CO2萃取产物中的18种成分占总出峰面积的98%以上，鸢尾超临界CO2萃取产物的主要成分是十四酸、十六酸和9十八烯酸

Using supercritical CO 2 to extact Agrimonia Pilosa Ledeb Extractive from Agrimonia Pilosa Ledeb ,thl best technelogic condition of it is,temperature 35～40℃;Pressure 16MPa;exact desage about 3000L Per grou

研究利用超临界CO2 从鹤草芽中萃取鹤草芽浸膏的工艺条件，考察了温度、压力、萃取剂用量等对浸膏收率的影响，结果表明，用超临界CO2 从鹤草芽中萃取鹤草芽浸膏的最佳萃取工艺条件为：温度 3 5～4 0℃，压力 1 6MPa，萃取剂用量：每组实验 3 0 0 0L左

The results showed that pH and the dosage of aspartic acid or citric acid had a significant effect on the extraction efficiency.

以天冬氨酸作为萃取剂，研究了其对上海桃浦污水处理厂污泥中重金属的萃取性能，重点考察了萃取体系pH值对重金属萃取的影响，并在相同条件下与柠檬酸的萃取过程进行比较。

The total contents of phenol compounds of fresh Boehmeria nivea root was 200.24± 0.93 mg/g, which is 4.5 times higher than ethanol extracts of fresh Boehmeria nivea leaf, and its ability to remove ABTS free radical is 7.4 times higher than that of fresh Boehmeria nivea leaf, which is one third of Trolox's ability to remove free radical. Antioxidant components of hot water extracts of Boehmeria nivea leaf exhibited 55 and 67% lower than that of fresh leaf respectively.

sulfonic acid］和DPPH(α，α-diphenyl-β-picrylhydrazyl)自由基为最高，其次为热水萃取物和冷水萃取物，而新鲜苎麻根乙醇萃取物总酚类含量为200.24 ±0.93 mg/g，约高於新鲜苎麻叶乙醇萃取物的4.5倍，其清除ABTS自由基能力是新鲜苎麻叶乙醇萃取物的7.4倍，约为维生素衍生物的1/3倍。

ConclusionThe extraction rate of volatile oils from Heracleum hemsleyanum Diels by supercritical CO2extraction process is higher than that of water vapor distillation,and the optimized extraction conditions are:extraction pressure 25MPa,extraction temperature 45℃ and flow rate of CO2 20L/h, and the yield of volatile oils is 0.65%.

超临界CO2萃取牛尾独活挥发油的萃取率较水蒸气蒸馏法高，最佳萃取条件为萃取压力25MPa，萃取温度45℃，CO2流量20L/h，挥发油收率为0.65%。

The effects of the surfactants, trioctyl phosphine oxide, sodium dodecyl sulfonate and hexadecyl trimethyl ammonium bromide, on the extraction rate of Co^2^+ were investigated. The acceleration in the kinetics in contributed to the associated molecule~2 TOPO taking part in the extraction process directly. The decrement effects of SDS or CTMAB on the rate of extraction kinetics of Co^2^+ with HDEHP were also observed, which caused by the adsorption of molecules of SDS or CTMAB on the interface and decreased the interfacial adsorption amount of HDEHP. In addition, the extraction rate was reduced by a bigger margin in HDEHP-SDS system. This can be explained in terms of the formation of an electric field at the interface.

研究体系中加入不同表面活性剂所引起萃取速率的不同改变：三辛基氧化膦因与HDEHP形成可萃取的Co^2^+活性分子缔合物，降低了萃取过程活化能而使反应加速；十二烷基磺酸钠和十六烷基三甲基溴化铵因占据发生萃取反应的界面区，减小了HDEHP与Co^2^+反应的机会而使反应减速； SDS还因其在界面形成较强的负电场，造成Co^2^+的附加势能而使萃取速率有更大幅度的降低。

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