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石墨炉原子吸收法已广泛应用于各种材料中鉏的测定。一些作者指出,在原子化过程中难挥发化合物碳化物的形成是鉏的测定灵敏度较低、检出限较差和造成记忆效应的主要原因,可以用热解涂层石墨管的方法加以改善。也有作者提出用易形成碳化物的元素(镧和锆等)浸渍或涂层石墨管来改善鉏的测定。但是,最近发表的文献则认为这种方法不能改善鉏的测定,反而使鉏的信号受到抑制,可能是浸渍元素的碳化物与鉏形成三元化合物所致。鉴于上述情况,本文对石墨炉原子收吸法测定鉏的各种因素进行了试验。拟定了测定大气漂尘中和冶金硅中鉏的条件,方法简便,可测定漂尘和0. 002至0. 1μg/m~3的鉏。
Graphite furnace atomic absorption method has been widely used in the determination of various materials 鉏. Some authors point out that the formation of hard-to-evaporate compound carbides in the atomization process is the main reason for the low sensitivity of detection, poor detection limits, and memory effects, which can be improved by pyrolytic coating of graphite tubes. It has also been suggested by the authors to improve the determination of limulus by impregnating or coating graphite tubes with easily carbide-forming elements (lanthanum and zirconium, etc.). However, the recent literature suggests that this method does not improve the determination of plutonium, but suppresses the plica signal, probably due to the formation of ternary compounds between the carbides and plutonium of the impregnated element. In view of the above situation, this article on graphite furnace atomic absorption method of determination of various factors were tested. Preparation of the determination of atmospheric drift and metallurgical silicon in the 鉏 conditions, the method is simple, can be measured drift and 0. 002 to 0. 1μg / m ~ 3 鉏.