What is the status of SRM 2034 Holmium Oxide Solution Wavelength from 240 nm to 650 nm?
This item is discontinued. However, as we have NEVER seen any degradation in old samples of SRM 2034, dating back to 1985, we recommend that customers not dispose of old samples when they expire. Purchase a new sample from any number of commercial sources in order to maintain traceability, but use the new sample to self-certify the expired sample as an in-house working standard. This process could be as simple as running annual back-to-back spectra of the current sample and the expired sample and writing up a brief in-house document equating the band positions for the two spectra with properly characterized uncertainties. The acceptable traceability chain can include any number of “links” beyond the measurement provided by a National Metrology Institute (NMI) such as NIST. Consult the NIST web site at www.nist.gov for a full treatment of the ISO conditions for traceability. For an approach using commercial CRMs and intrinsic properties to meet traceability needs formerly provided by th
