Burke R W, Deardorff E R, Menis O
Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234.
J Res Natl Bur Stand A Phys Chem. 1972 Sep-Oct;76A(5):469-482. doi: 10.6028/jres.076A.041.
Errors in the measurement of the absorbances of liquid filters result from instrumental and chemical uncertainties. This paper presents a systematic study of these variables on the absorbances of selected filters. Three types of liquid filters are discussed. These are (1) individual solutions of high purity compounds, (2) composite mixtures and (3) aqueous solutions of organic dyes. The accuracy of the absorptivity data is established using NBS-calibrated glass filters. The magnitude of the errors arising from spectral bandpass, beam geometry, stray light, internal multiple reflections, and refractive index are delineated. Finally, as a practical outgrowth of this study, the development and issuance of NBS Standard Reference Material 931, Liquid Absorbance Standards for Ultraviolet and Visible Spectrophotometry, is described.
液体滤光片吸光度测量中的误差源于仪器和化学方面的不确定性。本文对这些变量对所选滤光片吸光度的影响进行了系统研究。讨论了三种类型的液体滤光片。它们分别是：（1）高纯度化合物的单一溶液；（2）复合混合物；（3）有机染料的水溶液。使用经美国国家标准局（NBS）校准的玻璃滤光片来确定吸光系数数据的准确性。阐述了由光谱带宽、光束几何形状、杂散光、内部多次反射和折射率引起的误差大小。最后，作为本研究的实际成果，描述了美国国家标准局标准参考物质931《紫外和可见分光光度法液体吸光度标准》的制定和发布情况。
