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用分光光度法(比色法)和原子吸收光谱法分别测定高岭土中三氧化二铁(Fe2O3)含量。并对两种仪器分析方法所得结果作比较。结果表明,随Fe2O3变量,分光光度法和原子吸收光谱法均有较好的线性关系,但测定的结果有差异。分光光度法的操作简便,适用于大批量的简单样品的控制分析。原子吸收光谱法的标准加入法因可消除基体干扰,测得Fe2O3结果准确度更高,适合基体复杂的试样的分析,且仪器测定迅速。
The content of ferric oxide (Fe2O3) in kaolin was determined by spectrophotometry (colorimetric method) and atomic absorption spectrometry. The results of the two instrument analyzes were compared. The results showed that there was a good linear relationship between spectrophotometry and atomic absorption spectrometry with the variables of Fe2O3, but the results were different. The spectrophotometric method is easy to operate and is suitable for the control analysis of large quantities of simple samples. The standard addition method of atomic absorption spectrometry can eliminate the matrix interference and obtain higher accuracy of Fe2O3 results. It is suitable for the analysis of complex matrix samples and the rapid determination of instruments.