光吸收值,用OD 值或A值表示有什么不同?

2025-03-16 07:43:29
推荐回答(1个)
回答1:

光密度的定义是:入射光强度与透射光强度之比值的常用对数值。专业书籍则这样解释“吸光度”:入射光和透射光的透过率之比值的常用对数值,也称光密度。分析可见,两个概念其实是一致的,“光密度”就是“吸光度”,且用“光密度”符合国家标准,更规范。 吸光度,absorbance,是指光线通过溶液或某一物质前的入射光强度与该光线通过溶液或物质后的透射光强度比值的对数,影响它的因素有溶剂、浓度、温度等等吸光系数与入射光的波长以及被光通过的物质有关。只要光的波长被固定下来,同一种物质,吸光系数就不变。当一束光通过一个吸光物质(通常为溶液)时,溶质吸收了光能,光的强度减弱。吸光度就是用来衡量光被吸收程度的一个物理量。 吸光度用A表示。 A=abc,其中a为吸光系数,单位L/(g·cm),b为液层厚度(通常为比色皿的厚度),单位cm , c为溶液浓度,单位g/L 影响吸光度的因数是b和c。a是与溶质有关的一个常量。

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