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目前国内测定锂盐中镁是采用8-烃基喹啉氯仿溶液在正丁胺存在下,将pH调至10,萃取二次,继用盐酸反萃取后进行测定。测定镉采用螯合树脂交换分离洗脱后与其它离子一起进行测定。国外也有用Wofatit Y-29多孔性聚乙烯二乙烯苯树脂在含有0.25M8烃基啉溶液pH=11时,振荡一小时吸附的离子用HCl处理后测定Mg~(2+)及Cd~(2+)。我们利用0.1M二苯甲酞基甲烷(DBM)一苯溶液,在洒石酸钠存在下将pH调至11,同时萃出Mg~(2+)及Cd~(2+)与主体锂分离。0.4N HCl反萃取,镁萃取率为98.4％,镉为96.5％,回收率为95-105％,检测限为1×10~(-4)％,相对标准偏差3.2％。本法还可适用于氯化钠、钾、铷、铯样品中镁及镉的测定。
At present, the determination of magnesium in lithium salt is carried out by using 8-hydroxyquinoline chloroform solution in the presence of n-butylamine, adjusting the pH value to 10, extracting twice, and then carrying out back-extraction with hydrochloric acid for determination. Determination of cadmium by chelating resin exchange after separation with other ions were measured. Foreign also useful Wofatit Y-29 Porous polyethylene divinylbenzene resin containing 0.25M8 Hydrochloride solution pH = 11, the oscillation one hour adsorbed ions treated with HCl after the determination of Mg ~ (2+) and Cd ~ (2+ ). We use 0.1M dibenzylidenephthalein (DBM) -benzene solution to adjust the pH to 11 in the presence of sodium thionate, and extract Mg2 + and Cd2 + from the host lithium . 0.4 N HCl. The detection limit was 1 × 10 ~ (-4)% and the relative standard deviation was 3.2%. The recoveries of magnesium were 98.4%, 96.5% and 95-105% respectively. This method is also applicable to the determination of magnesium and cadmium in sodium, potassium, rubidium and cesium samples.