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3.火焰分光光度法从原理上讲,这个方法是发射光谱法的简化应用。所能测定的元素的数量有限,一般而言,仅限于其原子能够被火焰热能所激发的那些元素,而且还主要决定于所用火焰的温度。对于发射光谱法,假如要获得重现的结果,实验条件必须严格地标准化。通常被许多分析家忽视的一点是,当被测定的物质与标准中存在的物质不同时,会造成相当大的误差。因此,在大多数的岩石分析实验室中,采用相对低温的火焰分光光度法来测定Na和K,偶尔用来测定Li,以便仅仅激发少数几个元素,藉此来消除光源中的许多干扰。对于地球科学家来说,碱金属的准确测定是一个极重要的问题,
3. Flame spectrophotometry In principle, this method is a simplified application of emission spectroscopy. The limited number of elements that can be determined is generally limited to those elements whose atoms can be excited by the thermal energy of the flame, but also depends mainly on the temperature of the flame used. For emission spectroscopy, the experimental conditions must be strictly normalized if reproducible results are to be obtained. One point often overlooked by many analysts is that there is considerable error when the substance being measured differs from what is present in the standard. Therefore, in most rock analysis laboratories, relatively low temperature flame spectrophotometry is used to determine Na and K, and occasionally to determine Li to excite only a few elements, thereby eliminating many of the interference in the light source. For earth scientists, the accurate determination of alkali metals is a very important issue,