extraction n. 1.抽出,拔出。 2.【化学】提取(法);萃取(法);回收物,提出物;精炼。 3.精选,摘要。 4.血统,家世,出身。 5.【数学】开方,求根。 spirit of the first extraction 原汁酒。 a man of foreign extraction 外国(血统的)人。 extractions from a book 一本书的内容摘录。 an extraction of 81 percent 百分之八十一的出粉率,八一粉。 the extraction of root 【数学】开方法,求根法。
Extraction mechanism of purple crystallize on the aqueous two - phase system of tetrabutylammonium bromide and 2so4 mixture 硫酸铵双水相萃取法萃取结晶紫的行为研究
Au . the influence of several variables such as gold and cosolvent concentrations , shaking times , the ratio of tdmba and gold on the extraction of gold and the water concentration of the organic phase were studied . while the cosolvent ratio is more than 10 % , in the tdmba system , gold was extracted completely . the gold extraction mechanism was discussed on the bases of water concentrations of organic phases and infrared spectrum . it was found that the aggregation ratio of tdmba and au 等因素对萃取率的影响,并研究了有机相的连续萃取有机相金含量与水含量的关系。结果表明,助溶剂体积比10 %以上时,十四烷基二甲基苄基氯化铵对金具有萃取能力强,平衡时间短的特点。季铵盐阳离子与au cn