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NIST 935a Potassium Dichromate UV-VIS Photometric Accuracy Liquid Calibration Standard 

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Potassium Dichromate dissolved in Perchloric Acid (0.001N) is a tried and true method of verifying for absorbance accuracy (photometric) as well as linearity in the UV range. Producing several characteristic peaks throughout the UV range, Potassium Dichromate enables checking at 235nm, 257nm, 313nm, 350nm and 430nm. Precision Cells produces its own blend in house, derived from the NIST SRM 935a guidelines and permanently seals the contents in a fire-fused quartz cuvette.

Potassium Dichromate is specifically required by many labs conforming to European Pharmacopoeia (EP) as well as Current Good Manufacturing Practices (cGMP). Validation is frequently required to be performed every 3 months or after repairs.

If periodic calibration is not required by your particular lab, we strongly recommend choosing our FUV-series solid state calibration standards, which NEVER need to be recalibrated due to material aging. With just one filter, you can check for photometric accuracy and stray light for ANY points in the range of 200-700nm.


  • Verify for photometric accuracy and linearity in the UV range at the following wavelengths

o   235nm

o   257nm

o   313nm

o   350nm

o   430nm (only with the 600mg/L concentration)

Included with Potassium Dichromate Liquid Calibration Standard:
  • Instructions are included with every Potassium Dichromate liquid filter
  • Certificate of calibration with NIST traceability

Please allow one week of lead time from the time of order.

All of our calibration standards are proudly made in North America.

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P/N Description Unit of Measure (UOM) Price Quantity  
SRM-PD20 20mg/L Each $770.00
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SRM-PD40 40mg/L Each $770.00
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SRM-PD60 60mg/L Each $770.00
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SRM-PD80 80mg/L Each $770.00
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SRM-PD100 100mg/L Each $770.00
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SRM-PD120 120mg/L Each $770.00
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SRM-PD140 140mg/L Each $770.00
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SRM-PD160 160mg/L Each $770.00
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SRM-PD180 180mg/L Each $770.00
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SRM-PD200 200mg/L Each $770.00
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SRM-PD600 600mg/L Each $770.00
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SRM-HClO4BLANK Perchloric Acid Blank Each $150.00
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