利用0.1M二苯甲酰基甲烷(DBM)-苯溶液,在酒石酸钠存在下调节pH=11,可同时萃取镁、锌、镉与主体锂分离,0.4N盐酸反萃取,三者萃取率分别为98.4、100、96.8%,回收率为95～105%,检测下限为0.0001%。本法还可应用于RbCl、CsCl、KCl、NaCl样品申的镁、锌、镉的测定。目前测定锂盐中镁大都采用pH=10加入正丁胺与8-羟基喹啉氟仿溶液重复萃取二次,有机相合并反萃取后测定。镉采用螯合树脂交换分离。文献用wofatit Y-29多孔性聚乙烯二乙烯本树脂在含有0.25M 8-羟基喹啉溶液pH=11时与水样振荡1小时,吸附的微量元素用盐酸处理后测定镁、锌、镉等元素。Biul用wofatjt τ-150离子交换分离后用2N盐酸洗脱后用比色法测定锌、镉等杂质。本法的优点是方法简单,浓缩倍数较大,本法还对LiCl·H_2O试剂级进行了纯化,达到了提纯的目的。β-双酮广泛地用于许多金属离子萃取,唯结合本专题还未见报导。 Using 0.1M dibenzoylmethane (DBM) -benzene solution, pH = 11 in the presence of sodium tartrate, magnesium, zinc and cadmium were extracted simultaneously with the main lithium and 0.4N hydrochloric acid. The extraction rates of the three were 98.4,100,96.8%, the recovery rate was 95 ~ 105%, the detection limit was 0.0001%. This method can also be applied to the determination of magnesium, zinc and cadmium in RbCl, CsCl, KCl and NaCl samples. At present, the determination of magnesium in lithium salts mostly adopts the method of adding n-butylamine and 8-hydroxyquinoline fluoride solution at pH = 10 to extract twice, and the organic phases are combined and back-extracted for determination. Cadmium chelating resin exchange separation. Literature with wofatit Y-29 Porous polyethylene ethylene resin in the presence of 0.25M 8-hydroxyquinoline solution pH = 11 and the water sample shaking 1 hour, the adsorption of trace elements treated with hydrochloric acid after the determination of magnesium, zinc, cadmium, etc. element. Biul with wofatjt τ-150 ion exchange after separation with 2N hydrochloric acid after the colorimetric determination of zinc, cadmium and other impurities. The method has the advantages of simple method and large concentration ratio. The method also purifies LiCl · H_2O reagent grade to achieve the purpose of purification. β-diketone is widely used in many metal ion extraction, the only combination of this topic has not been reported.