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在原子吸收分析中,标准加入法是常被推荐的校准方法之一,它可以减小或消除物理干扰及某些化学干扰的影响。标准加入法一直都按线性外推计算样品浓度。然而在大多数情况下,原子吸收实际工作曲线都存在程度不同的弯曲,这使标准加入法的普遍应用受到限制。标准加入法能否进行非线性外推?它的准确性如何?迄今为止极少有人研究。在色谱分析中非线性工作曲线的标准加入法曾有报导,但在原子吸收分析中最近才有人研究。我们近
In atomic absorption analysis, the standard addition method is one of the commonly recommended calibration methods, which can reduce or eliminate the physical interference and the impact of some chemical interference. Standard addition method has been calculated by linear extrapolation of sample concentration. However, in most cases, bending curves of different degrees exist in the actual working curve of atomic absorption, which limits the universal application of standard addition method. Is there any non-linear extrapolation of the standard addition method? How accurate is it? Very few studies have so far been conducted. In the chromatographic analysis of non-linear working curve of the standard addition method has been reported, but in the recent study of atomic absorption analysis. We are near