The calibration curve represents the relationship between known CRM and the response of the instrument (e.g absorbance). Most of the time, in analytical chemistry standards, the linear function (of the 1st degree) is used to characterize the calibration curves. This, at first glance, has some major advantages: simple equation, simple linearity estimation criterion, and easy way of calculation. However, from a quality point of view, the grade 1 calibration curve does not characterize a working domain very well, because it does not take into account the curvature and has larger residuals.

中文翻译：

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引入曲率指数并改进离子色谱 （IC）、原子吸收光谱 （AAS）、紫外-可见分光光度法和催化燃烧中使用的校准曲线


校准曲线表示已知 CRM 与仪器响应（例如吸光度）之间的关系。大多数时候，在分析化学标准品中，线性函数（1 次）用于表征校准曲线。乍一看，这有一些主要优点：简单的方程、简单的线性估计准则和简单的计算方法。然而，从质量的角度来看，1 级校准曲线并不能很好地表征工作域，因为它没有考虑曲率并且具有更大的残差。