Reference material artifacts are commonly used for the qualification, calibration and quality control of UV/VIS absorption spectrophotometers used in chemical analysis and testing. The “metrological quality” of a spectrophotometer measurement standard is perhaps its most fundamental characteristic for it to be used in sound measurement assurance practices. It is critical that laboratory management and scientists be able to verify the “metrological quality” of each of its measurement standards, even when it is obtained from accredited suppliers, so that the analytical results can be validated. The transparency of their certificates must readily allow such property verifications as this is the only means available.
Near-Infrared Measurement Standard Artifact for Absorption Spectrophotometers NEW!
It is important that a spectrophotometer is qualified in a metrological manner to demonstrate that it is “fit for its intended purpose” prior to running any critical analytical method on it. Demonstration that an absorption spectrophotometer is “fit for its intended purpose” means that all relevant spectrophotometer parameters be tested and that the accuracy of each qualification measurement result meets or exceeds the specifications set forth in the analytical instrument requirements section of the validation protocol for each analytical method. For analytical methods run in the 650 nm to 900 nm wavelength region, the reference material artifacts must be certified so that their measurement scopes of calibration are applicable to this spectral region.
To continue with its history of innovation in UV/VIS spectrophotometric metrology, Stranaska Scientific is pleased to announce the availability of Refmacal CRM 1405 for science-based testing of absorption spectrophotometers that are used in the short-wave, near infrared (SW-NIR) region of the spectrum. The Refmacal CRM 1404 spectrophotometer calibration kit is comprised of glass filters that enable the testing of the following three important instrumental parameters:
- Spectral Bandwidth (Resolution)
- Wavelength Accuracy
- Photometric Accuracy/Linearity
Spectral bandwidth, or resolution, is tested by comparing measured absorbance ratios of two absorption bands in the 740 nm to 749 nm wavelength region to the certified reference absorption ratios provided in the Certificate of Calibration. The accuracy of the wavelength scale is tested by comparing the measured locations of minimum transmittance (or maximum absorbance) of five narrow absorption bands having nominal wavelength locations at 685 nm, 740 nm, 748 nm, 807 nm and 880 nm to the certified reference wavelengths provided in the Certificate of Calibration. The accuracy and linearity of the photometric scale is tested by comparing the measured values in transmittance or transmittance density (absorbance) of each of four photometric glass filters at wavelengths 650. nm, 700 nm, 750 nm, 800 nm and 880 nm0 the certified reference values provided in the Certificate of Calibration. The four glass filters have nominal percent transmittances of 1%T, 3%T, 10%T and 30%T which correspond to transmittance densities (absorbances) of 2.0, 1,5, 1.0 and 0.5, respectively.
Metal-on-Quartz (MOQ) Measurement Standard Artifacts for Absorption Spectrophotometers NEW!
Stranaska Scientific is the only company in the world that certifies metal-on-quartz (MOQ) filters with a rigorous science-based measurement uncertainty interval that can be rationalized and defended from a spectrophotometric metrological perspective. The unparalleled scientific expertise and analytical spectrophotometric acumen of the Stranaska Scientific laboratory staff underscores the company’s unique ability to recognize the importance of developing rigorous procedures that facilitate the calculation of an individual uncertainty interval for the assigned reference value at each photometric test wavelength. The specialized metallic coating substrate of each MOQ filter is often slightly different which leads to influence quantities derived from filter material properties and beam interaction affects that can sometimes exhibit wavelength dependence.
If you want to implement a science-based spectrophotometer calibration program and be able to defend it from a metrological perspective, the Stranaska CA2M 705, CA2M 750, CA2M 772 and CA2M 772 reference material artifacts are your only resource. We provide the MOQ filters in eleven (11) different filter configurations and measurement scopes of calibration to facilitate selection of the version that most closely matches your analytical method application.
CA2M 705
MAVRO Version [7052031-MAV]
Filter Configuration: 3 [Nominal 10%T, 30%T, 90%T][Nominal Transmittance Density 0.04, 0.5, 1.0]
Photometric Scope Test Wavelengths (nm): 10 [250.0, 280.0, 340.0, 360.0, 400.0, 465.0, 500.0, 546.1, 590.0, 635.0]
CA2M 750
705 Version [7502031-705]
Filter Configuration: 3 [Nominal 10%T, 30%T, 90%T][Nominal Transmittance Density 0.04, 0.5, 1.0]
Photometric Scope Test Wavelengths (nm): 10 [250.0, 280.0, 340.0, 360.0, 400.0, 465.0, 500.0, 546.1, 590.0, 635.0]
UVO Version [7502031-UVO]
Filter Configuration: 3 [Nominal 10%T, 30%T, 90%T][Nominal Transmittance Density 0.04, 0.5, 1.0]
Photometric Scope Test Wavelengths (nm): 4 [250.0, 280.0, 340.0, 360.0]
PDC Version [7502031-PDC]
Filter Configuration: 3 [Nominal 10%T, 30%T, 90%T][Nominal Transmittance Density 0.04, 0.5, 1.0]
Photometric Scope Test Wavelengths (nm): 4 [235.0, 257.0, 313.0, 350.0]
DNA Version [7502031-DNA]
Filter Configuration: 3 [Nominal 10%T, 30%T, 90%T][Nominal Transmittance Density 0.04, 0.5, 1.0]
Photometric Scope Test Wavelengths (nm): 4 [260.0, 280.0, 320.0, 350.0, 360.0]
CA2M 772
UVO Version [7722031-UVO]
Filter Configuration: 2 [Nominal 1%T, 3%T][Nominal Transmittance Density 1.5, 2.0]
Photometric Scope Test Wavelengths (nm): 4 [250.0, 280.0, 340.0, 360.0]
PDC Version [7722031-PDC]
Filter Configuration: 2 [Nominal 1%T, 3%T][Nominal Transmittance Density 1.5, 2.0]
Photometric Scope Test Wavelengths (nm): 4 [235.0, 257.0, 313.0, 350.0]
DNA Version [7722031-DNA]
Filter Configuration: 2 [Nominal 1%T, 3%T][Nominal Transmittance Density 1.5, 2.0]
Photometric Scope Test Wavelengths (nm): 4 [260.0, 280.0, 320.0, 350.0, 360.0]
CA2M 774
UVO Version [7742031-UVO]
Filter Configuration: 4 [Nominal 1%T, 3%T, 10%T, 30%T][Nominal Transmittance Density 0.5, 1.0, 1.5, 2.0]
Photometric Scope Test Wavelengths (nm): 4 [250.0, 280.0, 340.0, 360.0]
PDC Version [7742031-PDC]
Filter Configuration: 4 [Nominal 1%T, 3%T, 10%T, 30%T][Nominal Transmittance Density 0.5, 1.0, 1.5, 2.0]
Photometric Scope Test Wavelengths (nm): 4 [235.0, 257.0, 313.0, 350.0]
DNA Version [7742031-DNA]
Filter Configuration: 4 [Nominal 1%T, 3%T, 10%T, 30%T][Nominal Transmittance Density 0.5, 1.0, 1.5, 2.0]
Photometric Scope Test Wavelengths (nm): 4 [260.0, 280.0, 320.0, 350.0, 360.0]
Resolution Measurement Standard Artifact for UV Absorption Spectrophotometers NEW!
If your spectrophotometer qualification procedure does not include verification and validation of spectral bandwidth (or resolution), your UV/VIS absorption spectra and measurement results may be at risk. Compliance can be ensured because spectral bandwidth and resolution testing is now simplified and easy to do!
While spectral bandwidth (or resolution) is the most fundamental instrumental parameter of a UV/VIS absorption spectrophotometer, it is perhaps the most misunderstood parameter and, unfortunately, one that often goes unchecked. This important instrumental parameter needs to be verified periodically because spectral resolution impacts the quality of both wavelength and absorbance measurement results. Toluene in hexane (TOL/HEX) is a reference material artifact that is commonly used for the verification of spectral bandwidth or resolution, but it is often avoided because of the realization of its drawbacks.
To continue with its history of innovation in UV/VIS spectrophotometric metrology, Stranaska Scientific is pleased to announce the availability of its new resolution measurement artifact to verify and validate the spectral bandwidth of absorption spectrophotometers in the UV spectral region. It offers several key advantages over the use of toluene in hexane (TOL/HEX) for this vital performance evaluation and qualification task.
- Resolution can now be validated in real time simultaneously when using a certified holmium oxide solution for validation of the accuracy of the wavelength scale
- Ease of use because no reference blank solution cuvette is required
- Better discrimination between spectral bandwidths for verification and validation within the nominal bandwidth range of 0.5 to 2.0
- STRANASKA® concept can be used to upgrade SRM 2034, CRM 100, CA2M 709 and other commercial holmium oxide solution measurement standard artifacts
- STRANASKA® concept can be used to upgrade CRM 1404 and other commercial spectrophotometer calibration kits that contain holmium oxide solutions
Stranaska Scientific has now made it convenient and easy for analytical testing laboratories conducting UV/VIS chemical analysis to verify and validate UV/VIS spectrophotometer spectral bandwidth and resolution! Contact us today and we will be happy to send you additional information for improved resolution testing.
STRANASKA® CA2M 701 – Neutral-Density Glass Photometric Standard
This reference material artifact, which is patterned after the NIST SRM 2930 measurement standard, is intended for the verification of the transmittance and/or absorbance scales of molecular absorption spectrophotometers in the visible (VIS) and short-wave near infrared (NIR) regions of the electromagnetic spectrum. It is comprised of three glass filters (nominal 0.1%T , 0.3%T and 90%T) which are provided in a protective canister for storage and transportation purposes. The corresponding nominal transmittance densities of the three filters are 3.0, 2.5 and 0.04, respectively. Each filter is individually certified for transmittance and transmittance density at five (5) wavelengths: 440.0 nm, 465.0 nm, 546.1 nm, 590.0 nm and 635.0 nm. The advanced science-based calibration procedure ensures rigorous measurement traceability of the certified photometric values and uncertainties to NIST SRM 2930.
STRANASKA® CA2M 705 – Metal-on-Quartz Photometric Standard
This reference material artifact, which is patterned after the NIST SRM 2031 and NIST SRM 2031a measurement standards, is intended for the verification of the transmittance and/or absorbance scales of molecular absorption spectrophotometers in the ultraviolet (UV), visible (VIS) and short-wave near infrared (NIR) regions of the electromagnetic spectrum. It is comprised of two metal-on-quartz filters (nominal 10%T and 30%T) and one fused-silica filter (nominal 90%T) which are provided in a protective canister for storage and transportation purposes. The corresponding nominal transmittance densities of the three filters are 1.0, 0.5 and 0.04, respectively. Each filter is individually certified for transmittance and transmittance density at ten (10) wavelengths: 250.0 nm, 280.0 nm, 340.0 nm, 360.0 nm, 400.0 nm, 465.0 nm, 500.0 nm, 546.1 nm, 590.0 nm and 635.0 nm. The science-based calibration procedure ensures rigorous measurement traceability of the certified photometric values and uncertainties to the NIST SRM 2031 series.
STRANASKA® CA2M 706 – Cobalt-Nickel-Nitrate Solution/Cuvette Photometric Standard
This reference material artifact is intended for the calibration and/or verification of the absorbance scales of molecular absorption spectrophotometers in the ultraviolet (UV), visible (VIS) and short-wave near infrared (NIR) regions of the electromagnetic spectrum. Derived from the NIST SRM 931 series, it is comprised of three solution/cuvette filters which are provided in a protective canister for storage and transportation purposes. Each solution/cuvette filter is individually calibrated, relative to an air-only reference path, for apparent absorbance at four photometric test wavelengths (302.0 nm, 395.0 nm, 512.0 nm and 678.0 nm). A total of 12 apparent absorbance results (each result represents the assigned value and its associated uncertainty) are provided in the Certificate of Calibration.
STRANASKA® CA2M 708 – Potassium Dichromate Solution/Cuvette Photometric Standard
This reference material artifact is intended for the calibration and/or verification of the absorbance scales of molecular absorption spectrophotometers in the ultraviolet (UV) region of the electromagnetic spectrum. Derived from the NIST SRM 1935 series, it is comprised of two solution/cuvette filters. One filter is a sealed cuvette containing dilute sulfuric acid solution (serves as a blank reference), and the other filter is a sealed cuvette containing potassium dichromate in dilute sulfuric acid solution. When measured against the blank solution/cuvette filter, the potassium dichromate solution/cuvette filter provides nominal absorbance values over a photometric span of about 0.3 absorbance unit to 1.0 absorbance unit. The potassium dichromate solution/cuvette filter is calibrated, relative to the dilute sulfuric acid solution/cuvette filter, for apparent absorbance at four photometric test wavelengths (235.0 nm, 257.0 nm, 313.0 nm and 350.0 nm). A total of 4 apparent absorbance results (each result represents the assigned value and its associated uncertainty) are provided in the Certificate of Calibration. The two solution/cuvette filters are provided in a protective canister for storage and transportation purposes.
STRANASKA® CA2M 709 – Holmium Oxide Solution Wavelength Standard
This reference material artifact is intended for the calibration and/or verification of the wavelength scales of molecular absorption spectrophotometers in the ultraviolet (UV) and visible (VIS) regions of the electromagnetic spectrum. The solution is flame-sealed in a fused-silica cuvette of optical quality. The science-based calibration procedure ensures rigorous measurement traceability of the certified wavelength values and uncertainties to the holmium oxide solution intrinsic data standard.
STRANASKA® CA2M 711 – Spectral Bandwidth/Resolution Standard NEW!
This reference material artifact is intended for the verification and validation of the spectral bandwidth (SBW) of molecular absorption spectrophotometers in the ultraviolet (UV) region of the electromagnetic spectrum. The solution is flame-sealed in a fused-silica cuvette of optical quality. The science-based calibration procedure ensures rigorous measurement traceability of the certified apparent absorbance ratios to the NIST SRM 1935a photometric standard.
STRANASKA® CA2M 751 – Holmium Oxide Glass Wavelength Standard
This reference material artifact is intended for the calibration and/or verification of the wavelength scales of molecular absorption spectrophotometers in the ultraviolet (UV) and visible (VIS) regions of the electromagnetic spectrum. The science-based calibration procedure ensures rigorous measurement traceability of the certified wavelength values and uncertainties to the holmium oxide solution intrinsic data standard.
STRANASKA® CA2M 752 – Didymium Oxide Glass Wavelength Standard
This reference material artifact is intended for the calibration and/or verification of the wavelength scales of molecular absorption spectrophotometers in the ultraviolet (UV), visible (VIS) and short-wave near infrared (NIR) regions of the electromagnetic spectrum. The science-based calibration procedure ensures rigorous measurement traceability of the certified wavelength values and uncertainties to the holmium oxide solution intrinsic data standard.
STRANASKA® CA2M 790 – Spectrophotometer UV Calibration Kit COMING SOON!
This reference material artifact is intended for the metrological qualification and/or verification of molecular absorption spectrophotometers in the ultraviolet (UV) region of the electromagnetic spectrum. It consists of solid filters only so it is appropriate for analytical technicians or engineers who prefer not to have to handle fragile solution/cuvette filters. The kit is comprised of one (1) holmium oxide glass filter for wavelength accuracy testing, one (1) cutoff edge glass filter for testing for the presence of stray radiant energy (SRE) or stray light, and two (2) metal-on-quartz filters having nominal transmittance densities of 0.5 and 1.0, each of which is certified at wavelengths corresponding to the same wavelengths that potassium dichromate solution/cuvette filters are certified.
REFMACALTM CRM 400 – Neutral-Density Glass Photometric Standard
This reference material artifact is intended for the verification of the transmittance and/or absorbance scales of molecular absorption spectrophotometers in the visible (VIS) and short-wave near infrared (NIR) regions of the electromagnetic spectrum. Product Number 0400 is comprised of three neutral-density glass filters (nominal 10%T , 20%T and 30%T). Product Number 0400E is comprised of three neutral-density glass filters (nominal 1%T , 3%T and 50%T). Each unit is provided in a protective canister for storage and transportation purposes. Each filter is individually certified for transmittance and transmittance density at five (5) wavelengths: 440.0 nm, 465.0 nm, 546.1 nm, 590.0 nm and 635.0 nm. The science-based calibration procedure ensures rigorous measurement traceability of the certified photometric values to NIST SRM 930 or NIST SRM 1930.
REFMACALTM CRM 600 – Cut-Off Glass Stray Radiant Energy Standard
This reference material artifact is intended for the assessment of stray radiant energy (stray light) in molecular absorption spectrophotometers in the ultraviolet (UV) and visible (VIS) regions of the electromagnetic spectrum. The test measurement principle of this standard is derived from the test measurement principle of NIST SRM 2032. The CRM 600 measurement standard is comprised of three different filters which facilitate testing in three different regions of the spectrum. In the ultraviolet spectral region, the science-based calibration procedure ensures rigorous measurement traceability of the certified photometric values and uncertainties of Filter 628 (or Filter 629) and Filter 638 to NIST SRM 2031. In the visible spectral region, the science-based calibration procedure ensures rigorous measurement traceability of the certified photometric values and uncertainties of Filter 647 to NIST SRM 930, NIST SRM 1930 and NIST SRM 2930.
Order Placement and Payment Information
Stranaska’s spectrophotometric measurement services are acquired by providing valid credit card information (VISA, MasterCard and AMEX) or by issuing an authorized purchase order directly to Stranaska Scientific LLC. The purchase order must clearly include: (i) the product name and number of the measurement standard, (ii) quotation reference order number, and (iii) the measurement services fee. The purchase order must also have explicit billing instruction and accounts payable contact information. Purchase requisitions are not accepted in lieu of authorized purchase orders. International orders and/or drop shipments may require payment in advance. Telephone 970-282-3840. E-mail [email protected].
Purchase Order Address
Stranaska Scientific LLC
Post Office Box 270334
Fort Collins, Colorado 80527-0334
