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1引言化学计量学方法由于用数学手段代替了分析化学中常用的化学分离或物理化学分离方法而日益受到人们的关注。导数光谱可消除低频背景干扰，可减少某些物质以及仪器上漂移带来的干扰，并可消除实验中由不同比色皿的透光率不同带来的干扰。本文采用Graen等提出的“减法（加法?
1 Introduction Chemometrics methods are gaining increasing interest due to the mathematical means of replacing chemical separation or physicochemical methods commonly used in analytical chemistry. Derivative spectra eliminate low-frequency background interference, reducing the effects of some materials and drift on the instrument and eliminating the interference caused by the different light transmittance of different cuvettes in the experiment. In this paper, Graen and other proposed "subtraction (addition?