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铍中铝的测定一、方法要求: 在乙酸钠缓冲液中,用氯仿萃取8-羟基喹啉铝,在pH低于5时,铍的羟基喹啉盐不被萃取,但如用羟基喹啉的氯仿溶液萃取,铍的存在有干扰。因此,在pH4.8时萃取,可使铝与主体铍分离。并用光度法测定铝,其最大吸收波长在385毫微米,可测范围为0～20微克铝/25毫升。铁、铜、镍等干扰测定,利用铝不与铜试剂作用的特点,预先用铜试剂-氯仿将这些
Determination of beryllium aluminum First, the method requirements: In sodium acetate buffer, chloroform extraction of 8-hydroxyquinoline aluminum at pH below 5, beryllium hydroxyquinoline salt is not extracted, but as with hydroxyquinoline Chloroform solution extraction, the presence of beryllium interference. Therefore, extraction at pH 4.8 allows the separation of aluminum from the body beryllium. And the determination of aluminum by spectrophotometry, the maximum absorption wavelength of 385 nm, the measurable range of 0 to 20 micrograms of aluminum / 25 ml. Iron, copper, nickel and other interference determination, the use of aluminum and copper reagents do not have the characteristics of the copper reagent in advance with chloroform