pre concentration信息详情
n.预选；预浓缩；预先富集
pre───abbr.炼油工程师（PetroleumRefiningEngineer）
concentration───n.浓度；集中；浓缩；专心；集合
impurity concentration───[电子]杂质浓度
pre reading───adj.阅读前的
pre out───前输出
high concentration───高浓度，高强度
concentration curl───[体]单臂哑铃弯举
pre pay───vt.预付；提前缴纳
concentration camps───n.集中营( concentration camp的名词复数 )
concentration of atmospheric carbon, an important indicator of global warming, has shot from 280 parts per million in pre-industrial times to 386 PPM last year and appears to be accelerating.───全球变暖的重要指示——大气的碳浓度——已经从工业社会前的280ppm (parts per million)激增到386 p pm，而且这一速度似乎还在增加。
effects of reaction conditions were studied, including the kind of solvent, polymerization temperature, the concentration of template and initiator, rotational speed and pre-polymerization time.───考察了聚合反应条件，如溶剂种类、聚合温度、模板浓度、引发剂用量、转速、预聚合时间等对分子印迹聚合物微球特性的影响。
method for the spectrophotometric determination of trace Cu 2+ with flow injection liquid liquid extraction separation and pre concentration was developed.───用自制的分相器与流动注射仪联用，对有机相析出液- 液萃取光度法测定微量铜的流路参数和操作程序进行优化。
This method achieved a very low limit of detection by pre-concentration to satisfy the requirement of detection of trace estrogens in water.───该方法主要针对水中的痕量雌激素，采用对样品进行富集和测定，从而大大地降低了检测限。
Research of Conditions of Trace Plumbum Pre-Concentration from Water on a Cylinder of Activated Carbon Using Dithizone as a Chelating Agent───双硫腙-活性炭柱富集分离水中痕量铅的条件研究
Application of Pre-concentration of hematite and Exploration of a New Magnetic Separation Technology at Gushan Mine───姑山赤铁矿预选工艺的应用及磁选新工艺的探索
Simultaneous Determination of Trace Nb, Ta, Zr, Hf in Geological Samples by AES after Separation and Pre-concentration with Tannic Cotton───丹宁棉分离富集-发射光谱法同时测定地质样品中微量铌钽锆铪
Dynamic Pre-concentration of Light Hydrocarbons at Room Temperature───低碳烃的常温动态预浓缩方法
Flow Injection On-line Double Micro-column with Chelating Resin Pre-concentration System for Cu, Pb, Cd and Mn Determination by FAAS───流动注射在线螯合树脂双柱预富集火焰原子吸收法测定痕量铜、铅、镉和锰