论文部分内容阅读
至今,石墨炉原子吸收法(GFAAS)仍和其它绝大多数仪器分析法一样,每次分析之前,往往都要事先配制一套标准系列,绘制校正曲线,然后根据校正曲线及样品的吸收值计算分析结果,或者用标准加入法进行分析。无论如何GFAAS仍然局限于采用标准溶液进行相对比较的方法进行分析。这主要是因为:对于不同的仪器、不同的样品基体、甚至在同一实验室条件下的不同时间,同一元素的校正曲线并不是固定不变的(灵敏度发生变化)。怎样才能根据已知的基本常数从理论上估计测量读数,计算校正曲线,且校正曲线又是相对稳定的,即不受仪器差别、时空及样品基体的影响。实现AAS绝对分析,这是广大AAS分分析工作者所关心的问题之一。
To date, graphite furnace atomic absorption spectrometry (GFAAS) is still the same as most other instrumental analysis methods. Before each analysis, a set of standard series is usually prepared and a calibration curve is drawn. Based on the calibration curve and the sample absorption Analyze the results, or use the standard addition method for analysis. In any case, GFAAS is still limited to using standard solutions for comparative analysis. This is mainly due to the fact that the calibration curves for the same element are not constant (sensitivity changes) for different instruments, different sample matrices, even at different times under the same laboratory conditions. How can we theoretically estimate the measured readings according to the known basic constants, calculate the calibration curve, and the calibration curve is relatively stable, that is, it is not affected by the difference of instruments, space-time and sample matrix. To achieve AAS absolute analysis, this is one of the issues that most AAS sub-analysts care about.