Certified Reference Materials to Check the Photometric Accuracy
To check the photometric accuracy Hellma Analytics offers different kinds of standards:
Neutral density glass filters are very well suited for testing in the visible range, checking the photometric accuracy with potassium dichromate dissolved in perchloric acid is the approved method for the UV region.
Typically used reference materials have broad peaks and valleys.
In accordance with regulations
The following table shows the standards offered by Hellma and their compliance references:
> View table
When measuring the photometric accuracy (absorption), the light beam of the spectrophotometer flows through the filter used. The light attenuation generated by the filter reveals the absorption value.