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近年来，Ｌｉ和Ｇｅｌｌｅｒｓｔｅｄｔ发现用紫外／可见光分光光度计快速准确测定卡伯值的方法。这种方法的基本原理是基于在特定波长（５４６ｎｍ）下，高锰酸钾的浓度与高锰酸钾的吸光度成正比。分光光度法测定卡怕值的特点是：测定时间在５ｍｉｎ之内完成；结果准确，与Ｔ?
In recent years, Li and Gellerstedt found a rapid and accurate method for the determination of kappa number by UV / visible spectrophotometer. The rationale for this method is based on the fact that the concentration of potassium permanganate is proportional to the absorbance of potassium permanganate at a specific wavelength (546 nm). Spectrophotometric determination of the characteristics of the card is afraid of: the determination of time within 5min to complete; accurate results, and T?