The Certified Reference Material sets have been assembled to make your verification task easier, and meet specific regulatory requirements. In addition, set prices do offer price savings over the purchase of individual Certified Reference Materials.
So where possible use the general syntax rules to construct your own set, even if it is simply an absorbance and wavelength set.
For example, a 60 mg/l potassium dichromate, together with a holmium oxide solution can be ordered under the part number RM-06HL.
| Primary Requirement | Catalogue Number | Construction Parameter | Material | Wavelength |
| Full specification verification |
RM-06HLKCSITX |
Absorbance
Wavelength Stray light Resolution |
Potassium dichromate 60 mg/l, blank Holmium oxide Potassium chloride, sodium iodide, blank Toluene in Hexane | 235
to 350 nm 240 to 650 nm 200 & 260 nm 265 to 270 nm |
| Photometric
linearity |
RM-0204060810 | Absorbance | Potassium dichromate 20, 40, 60, 80, 100 mg/l, 0.001M perchloric acid blank | 235 to 350 nm |
| Pharmacopoeia compliance | RM-06HLKCTX | Absorbance
Wavelength Stray light Resolution |
Potassium
dichromate 60 mg/l, blank Holmium oxide Potassium chloride, blank Toluene in Hexane |
235
to 350 nm 240 to 650 nm 200 nm 265 to 270 n |
| Similarity
to NIST (USA) SRMs |
RM-06HLKI | Absorbance
Wavelength Stray light |
Potassium
dichromate 60 mg/l, blank Holmium oxide Potassium iodide, blank |
235
to 350 nm 240 to 650 nm 260 nm |
| Similarity to NIST (USA) SRMs | RM-1N2N3N | Visible Absorbance | N.D. glass 1.10, 0.78, 0.56 A., blank | 440 to 635 nm |
| Similarity to NIST (USA) SRMs | RM-N1N35N | Visible
Absorbance |
N.D. glass 2.10, 1.60, 0.30 A., blank nm | 440 to 635 |
| High end visible wavelength | RM-06DLKI | Absorbance
Wavelength Stray light |
Potassium
dichromate 60 mg/l, blank Didymium Potassium iodide, blank |
235
to 350 nm 290 to 870 nm 260 nm |
Compliance references
| Material | Test | Range | USP | Ph. Eur. | BP | ASTM | TGA |
| Potassium Dichromate | Absorbance | UV/Visible | * | * | * | * | * |
| Neutral Density Filters | Absorbance | Visible | * | * | * | * | * |
| Holmium Oxide | Wavelength | UV/Visible | * | * | * | * | * |
| Potassium Chloride | Stray Light | UV | * | * | * | * | * |
| Potassium Iodide | Stray Light | UV | * | . | . | * | . |
| Sodium Iodide | Stray Light | UV | . | * | * | * | * |
| Toluene in Hexane | Resolution | UV | . | * | * | . | * |
How often do I need to recertify my Certified Reference Material?
To ensure the validity of the calibration values of these Certified Reference Materials it is recommended that they are re-certified at regular intervals. The periodicity of this recertification is under the control of the user, and is specific to the laboratory environment under which
the unit is used.
To establish a statistical basis for determining this recertification interval, it is suggested that the Certified Reference Material in question be re-certified every 12 months for at least the first three years of use, and thereafter at a periodicity deemed suitable for the laboratory environment;
the interval between calibrations being established from the data generated in the first three years. Review of this process should be incorporated in any formal control of the system, and any major changes in the laboratory environment should be evaluated as to their impact on the calibration of the unit. (see MSDS)
