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本标准按照固定名称E131颁发,在名称之后的数字标明原正式通过的年份,如有修定,则表明最新修定年份。括号内的数字表示最近重新批准的年份。上标依普西龙(a)表明最新修定或重新批准后的编辑改动。说明:关于核磁共振的其它定义,请参见ASTM标准年卷第14.01卷中登载的核磁共振(NMR)波谱学的定义E386、术语、符号、惯例和参考文献。吸光度(absorbance),A——透光率(T)倒数的常用对数(即以10为底的对数)。A=log_(10)(1/T)=-log_(10)T讨论——在实际应用中,T为观侧到的透光率。吸光度是指超过参考物或标准物的多余吸收。那就意味着由反射、溶剂吸收和折射效应所造成的损失已得到补偿,且散射导致的衰减与吸收造成的衰减相比是很小
This standard is issued under the fixed designation E131. The number after the name indicates the year originally passed. If there is any amendment, the latest revision year is indicated. The numbers in parentheses indicate the year of recent reapproval. Superscript Ipilirucine (a) Indicates editorial changes since the latest revisions or reapproval. Note: For other definitions of NMR, see Definitions E386, Terms, Symbols, Practices, and References for Nuclear Magnetic Resonance (NMR) Spectroscopy as published in Volume 14.01 of the ASTM Standard. Absorbance (absorbance), A - common logarithm (the base 10 logarithm) of the inverse of light transmittance (T). A = log_ (10) (1 / T) = - log_ (10) T DISCUSSION - In practical applications, T is the side-to-side transmittance. Absorbance refers to excess absorption over a reference or standard. That means that the losses caused by the effects of reflection, solvent absorption and refraction have been compensated and the attenuation due to scattering is small compared to the attenuation due to absorption