Certified reference materials extend the instrument qualification range to 200nm, unlike most commercially-available UV CRMs which have lower limits around 240nm
Many of the most important spectrophotometric analyses require measurement in the ultra-violet region from 200-280nm.
Instrument qualification carried out using traditional glass filter CRMs may well not be valid when measured in the visible region, and then extrapolated in to the UV region.
This could be due to instrument characteristics, which may differ over the extended range.
Thus far virtually all commercially available 'UV' CRMs have a lower wavelength limit of 240nm.
Starna has produced two new Certified Reference Materials, which generally extend the instrument qualification range to 200nm, and are presented as solutions sealed into far-UV quartz cells.
One CRM is for wavelength calibration, and contains a solution of rare-earth oxides.
The other CRM is a series of nicotinic acid solutions for validating the measured absorbance and linearity scale.
Both are traceable to Nist primary references and are produced and certified in Starna's (Ukas accredited) ISO/IEC 17025 calibration laboratory.
Starna also supplies a wide range of other certified reference materials for spectrophotometry and offer an accredited recalibration service for its own and other manufacturers' CRMs.
