Set of 5 concentrations and a blank
Catalog Number: RM-0204060810
| Description | Potassium dichromate in perchloric acid sealed in a quartz cell |
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| Primary Usage | Test the absorbance scale of UV spectrophotometers |
| Useable Range | 235nm to 350nm ( 20mg/L to 100mg/L) or 430nm (600mg/L) |
| Physical Configuration | Far UV quartz cell that has been permanently sealed by heat fusion |
| NIST Traceability | Each set is supplied with a certificate of analysis and NIST Traceability. The 600mg/L is used for compliance with the European Pharmacopoeia and is also traceable to NIST. All certificates are supplied by our ISO 9001, ISO 17025 and UKAS accredited laboratory. |
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Set of 5 concentrations and a blank |
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Product Description |
Potassium Dichromate solvated in dilute (0.001N) perchlorate acid has been found to be the best method for testing the absorbance scale and linearity of spectrophotometers in the UV. Starna purchases the potassium dichromate crystals directly from NIST (SRM 935a). We then make up the solutions as per the instructions from NIST and permanently heat fuse seal the solutions in UV quartz spectrophotometer cells. |
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Suggestions for Use |
Measure the absorbance of the potassium dichromate cells at the four wavelengths specified by NIST. These wavelengths for the 20 to 100mg/L solutions are 235, 257, 313 and 350nm and the 600mg/L solution measurement is made at 430nm. The absorbance scale is verified by assuring that the absorbance readings on your instrument are within your instruments tolerance to the readings on the certificate supplied with the reference set. To evaluate linearity, plot a graph of concentration against absorbance for each of the four wavelengths. The 600mg/L solution is used for European Pharmacopoeia compliance with a single wavelength measurment. |
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Scan of Potassium Dichromate set |
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Linearity Graph |
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Approximate Absorbances |
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Interpertation of Results |
Compare the absorbance values from your instrument with the expected values on the certificate supplied with the reference set. If the readings are within the expected range for your instrument then your absorbance scale is correct. If not, consult your service techincian and have the instrument evaluated |
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Quality program |
Each time that the analysis is repeated you can compare the new results with the previous results to check for any variance. If your instrument needs service because of a change in resolution, the historical data will greatly assist the service technician. |
| Catalog Number | Description | Price each |
|---|---|---|
| Linearity Dichromate set | ||
| RM-0204060810 | Potassium Dichromate Reference set, 5 Concentrations | US$ 1,800.00 |
| Linearity Dichromate set with 430nm European Pharmacopoeia Compliance | ||
| RM-020406081060 | Potassium Dichromate Reference set, 6 Concentrations | US$ 2,180.00 |
| Single concentrations: | ||
| RM-02 | Potassium Dichromate Reference set, 20mg/L | US$ 750.00 |
| RM-04 | Potassium Dichromate Reference set, 40mg/L | US$ 750.00 |
| RM-06 | Potassium Dichromate Reference set, 60mg/L | US$ 750.00 |
| RM-08 | Potassium Dichromate Reference set, 80mg/L | US$ 750.00 |
| RM-10 | Potassium Dichromate Reference set, 100mg/L | US$ 750.00 |
| Single concentration, European Pharmacopoeia Compliance: | ||
| RM-60 | Potassium Dichromate Reference set, 600mg/L | US$ 750.00 |
| Starna Cells, Inc | PO Box 1919 | Atascadero, CA 93423 USA |
| Phone: 805-466-8855 | Fax: 805-461-1575 | e-mail: sales@starnacells.com |