单词preconcentration
n.: 预富集；预选；预浓缩
网络: 前浓缩；预先富集；预浓缩系统
预浓缩
预选
预富集
Hence, the preliminary separation and preconcentration of trace elements from matrix is often required.
因此，从基体中分离和预富集痕量元素显得十分必要。
A lot of facts have show that the preconcentration has been used for trace analysis with satisfactory result and low detection limit.
大量文献表明预富集技术用于痕量分析取得满意的效果，降低了检测限，提高了灵敏度。
Because of the content of microelements is extremely low, the preconcentration is usually necessary.
由于这些微量元素的含量很低，通常在测定前要进行预富集。
The composition, work principle as well as measurement and control system of a new X-ray separator for ore preconcentration are presented.
介绍了新型矿石预选设备X射-线分选机的组成、工作原理及其测量操作系统。
High sensitivity detector and sample preconcentration techniques are often adopted to improve concentration detection limits in CE.
为此，常采用高灵敏的检测器和样品预富集技术来提高毛细管电泳的检测灵敏度。
Both batch and column variants of SPE can be used for preconcentration purposes.
固相萃取的分配变量和圆柱变量都可以用于预浓缩的用途。
The single-drop microextraction is a very promising "environment friendly"technique of separation and preconcentration.
有机化合物的有效方法，是一种有发展前途的的分离富集技术。
Preconcentration of phthalate esters in environmental aquatic samples by n - octadecyl -bonded membrane extraction .
环境水样中邻苯二甲酸酯固相膜萃取预富集方法。
The preconcentration of lean magnetite ore for discarding the tailings has good economic feasibility.
预选抛尾后的贫磁铁矿分选处理，具有良好的经济可行性。
In order to improve the detection sensitivity of capillary electrophoresis, various sample preconcentration methods have been developed.
为了提高毛细管电泳的检测灵敏度，多种样品富集的方法得以发展。