|Description & NIST Traceability||An ultra-stable solution permanently sealed by heat fusion in quartz cells. NIST traceable complete with UKAS ISO/IEC 17025 accredited certificate of calibration|
|Primary Usage||Testing absorbance scale and wavelength accuracy in the Deep UV region.|
|Certified Wavelengths||191, 209 and 226 nm.|
|Physical Configuration||Far UV quartz cells that have been permanently sealed by heat fusion.|
Qualifying a UV spectrophotometer in the Deep UV presents particular problems associated with the short wavelengths, reduced energy and sensitivity as well as the variability in transmission characteristics of UV grade quartz below 200 nm.
These problems have been overcome with this unique stable reference by using innovative design and manufacturing protocols.
The reference consists of a TS8* solution, which has distinct absorption/transmittance and peak characteristics in the deep UV, supplied together with a solvent blank permanently sealed by heat fusion into physically identical Far UV quartz cells.
In addition to absorbance qualification this reference is also certified for wavelength qualification. This allows user flexibility as the reference is supplied with certified wavelength and absorbance values at two different spectral bandwidths, 1.0 and 5.0 nm.
The Starna TS8 Deep UV reference set of proven stability is supplied with a Certificate of Calibration valid for two years by the Starna Calibration Laboratory, which is accredited by UKAS under ISO/IEC 17025, and ISO Guide 34.
*TS8 is a proprietary matrix with the necessary spectral characteristics and stability to be used as a reference material.
Suggestions for Use:
The peak wavelengths should first be identified by performing a wavelength scan at over the range from 190 to 260 nm at the required spectral bandwidth. These peaks should be verified as being within the expected wavelength tolerance.
The spectrophotometer absorbance values at these peak wavelengths can then be measured and compared to the certified absorbance values taking the expanded uncertainty budget† of the certified references into consideration.
If the absorbance values fall within the expected parameters of your instrument then your instrument is working correctly.
If it is determined that your instrument is not giving you the correct values, consult your service technician for advice on how to determine and correct any problem, which this reference may have detected.
† Expected Parameters and Expanded Uncertainty Budget
The expanded uncertainty budget (k=2) is the tolerance that we could expect to measure in the assigned value on any one of our reference spectrophotometers during the 2 year period of certification.
When used to verify the performance of any given spectrophotometer this certificate tolerance must be added in a simple linear manner to the stated appropriate specification accuracy of the instrument on the test, see following example:
|Certificate||±0.10 nm||±0.0049 A|
|Instrument||±0.30 nm||±0.0050 A|
|Total||±0.40 nm||±0.0099 A|
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