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金属镍中微量镁的测定方法,大都采用预先分离镍等干扰元素,然后进行比色测定。其中汞阴极电解分离比色法较常用,但该法结果不够稳定,往往还需再经铜试剂-氯仿萃取分离,手续繁琐。离子交换分离比色法及其它几种方法,都存在着或者分离手续冗长,或者需用大量氰化钾,或者方法的灵敏度不能满足要求等不足之处。最近几年来发展了原子吸收分光光度法,此法灵敏度高,且不经复杂的分离手续,可直接进行测定,是一种测定镁的最为简便、快速的方法,但因条件所限,目前尚未能广泛使用。
Metallic nickel in the determination of trace amounts of magnesium, mostly using pre-separation of nickel and other interfering elements, and then colorimetric determination. Mercury cathode electrolysis separation colorimetric method is more commonly used, but the results of the method is not stable enough, often need to go through the copper reagent - chloroform extraction and separation, the procedure cumbersome. Ion exchange separation colorimetry and several other methods, there are either lengthy separation procedures, or the need to use large amounts of potassium cyanide, or the sensitivity of the method can not meet the requirements and other deficiencies. In recent years, the development of atomic absorption spectrophotometry, this method is highly sensitive, and without complex separation procedures can be directly measured, is a magnesium determination of the most convenient and rapid method, but the conditions are limited, the current is still Not widely used.