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内标法是 ICP 发射光谱分析的方法之一。文献曾报道过向样品及标准溶液中加入等量的内标元素,通过测定分析物与内标的强度比值求含量,可以提高精密度与准确度。选择内标时,要考虑其光谱特性及雾化过程特性与分析物的特性相匹配。但有的研究结果表明,当一个元素的激发能和电离能与分析物有很大差别(甚至分别为原子线及离子线)时,只要适当选择操作条件,使谱线的信号间密切相关,仍可被选作内标。
Internal standard method is one of the methods of ICP emission spectrometry. It has been reported in the literature that an equivalent amount of internal standard element is added to a sample and a standard solution, and precision and accuracy can be improved by determining the ratio of the intensity of the analyte to the internal standard. When selecting an internal standard, consider the spectral characteristics and characteristics of the atomization process that match the properties of the analyte. However, some studies have shown that when the excitation energy and ionization energy of an element are greatly different from those of the analyte (even the atomic and ionic lines, respectively), the operating conditions are appropriately selected so that the signals of the spectral lines are closely related, Still be selected as internal standard.