Standard Reference Materials: Glass filters as a standard reference material for spectrophotometry - selection, preparation, certification, and use of SRM 930 and SRM 1930

This publication describes the various factors that can affect the proper functioning of a spectrophotometer and suggests procedures to assess and control these factors. Particular consideration is given to the longand short-term stability of a spectrophotometer, wavelength accuracy, spectral bandpass, stray radiation, and the accuracy of the transmittance or absorbance scale. A description is given of the Standard Reference Materials (SRMs) that can be used to control these factors. The methods for the preparation, certification, and use of two such materials (SRM 930 and SRM 1930) are also presented. The results obtained in the actual use of these SRMs are examined in some detail. An Appendix contains the reproduction of several publications and Certificates relevant to the subject discussed in this publication.