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水杨酸(H_2Sal)和磷酸三丁酯(TBP)在萃取希土元素时有很显著的协萃效应,我们试验表明:当水相中H_2Sal浓度为0.05M时,在pH5.5—8.2的范围内,镧可被10％TBP四氯化碳溶液定量萃取,而镁(1克)不被萃取;钙(5毫克)在pH<7也几乎不被萃取(萃取率约≤1％),pH>7,钙的萃取率稍有增高。在pH6,一次萃取即可使微量希土元素与大量镁及少量钙定量分离。结合偶氮胂Ⅲ比色测定,为镁中微量希土元素的测定提供了一个简便的分离和测定方法。具体步骤如下:含有1克镁、5毫克钙及4微
Salicylic acid (H2Sal) and tributyl phosphate (TBP) in the extraction of rare earth elements have a significant synergistic effect, our test showed that: when the water phase H2Sal concentration of 0.05M, at pH5.5-8.2 Lanthanum can be quantitatively extracted with 10% TBP CCl 4 solution while magnesium (1 g) is not extracted; calcium (5 mg) is almost not extracted at pH <7 (with an extraction rate of ≤1%), pH> 7, the calcium extraction rate slightly increased. At pH 6, a trace of rare earth elements can be extracted with a large amount of magnesium and a small amount of calcium. Combined with arsenazo Ⅲ colorimetric assay, it provides a convenient method for the determination and determination of trace amounts of rare earth elements in magnesium. Specific steps are as follows: contains 1 g of magnesium, 5 mg of calcium and 4 micro