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近年来,国外使用发射光谱法测定金属中的气体杂质,得到广泛的研究和应用。其灵敏度、准确度和操作快速是令人满意的。测定金属中气体的发射光谱法因使用的光源、测定手段等不同而分类,在资料中进行了专门的评述。以空心阴极为光源、光电直读测定的方法,其灵敏度为1微克氧,变动系数6～15%,每块试样测定仅2.5分钟,是一种灵敏、快速的方法。方法原理由于气体元素的易挥发性和较高的激发电位(10～13eV),在空气中使用金属电极间的电弧放电,它们的谱线实际上并不出现,而在空气中使用碳电弧放电仅出现微弱谱线,因此必须在真空或惰性气氛中激发。空心阴极光电直读法是将金属试样在充氦(或氩)
In recent years, foreign countries using emission spectrometry gas impurities in metals, has been widely studied and applied. Its sensitivity, accuracy and fast operation are satisfactory. Emission spectrometry for the determination of metals in gases is classified according to the light sources used, the means of measurement, etc., and is specifically reviewed in the literature. Hollow cathode as a light source, photoelectric direct reading determination method, the sensitivity of 1 microgram of oxygen, the coefficient of variation 6 ~ 15%, each sample was only 2.5 minutes, is a sensitive and rapid method. Methodology Due to the volatility of the gas elements and the high excitation potential (10-13 eV), arcs between metal electrodes are used in the air, their spectra do not actually appear, and in the air carbon arc discharge Only weak lines appear and must be excited in a vacuum or inert atmosphere. Hollow cathode photoelectric direct reading method is a metal sample filled with helium (or argon)