Potassium dichromate liquid filter (235 - 430 nm)

for checking photometric accuracy according to Ph. Eur. and USP<857>

Potassium dichromate in perchloric acid is very suitable for checking the photometric accuracy of spectrophotometers. In the UV range, the Potassium dichromate spectrum has characteristic maxima at 257 nm and 350 nm and characteristic minima at 235 nm and 313 nm. The spectrum reaches a plateau at 430 nm, which is used to determine photometric accuracy in the visible range.

Hellma Analytics purchases the reference material for this filter directly from NIST (SRMR 935a “Potassium Dichromate”). The filter solutions are manufactured in strict compliance with NIST requirements and filled under controlled conditions. The cuvettes are then immediately fused to become airtight.

Typical spectrum of a Potassium dichromate solution with 60 mg/l measured at a slit width of 2 nm.

 

Absorbance table of Potassium dichromate filters UV20 - UV0200

typical absorptions at standard wavelengths

Type Art.-No. 235 nm 257 nm 313 nm 350 nm
UV20 667020 0.25 0.29 0.10 0.22
UV40 667040 0.50 0.57 0.20 0.43
UV60 667060 0.75 0.86 0.30 0.65
UV80 667080 1.00 1.16 0.40 0.86
UV0100 6670100 1.25 1.45 0.50 1.07
UV0120 6670120 1.50 1.75 0.60 1.28
UV0140 6670140 1.75 2.05 0.70 1.50
UV0160 6670160 2.00 2.35 0.80 1.70
UV0180 6670180 2.25 2.65 0.90 1.90
UV0200 6670200 2.50 2.95 1.00 2.10

Type Article-No. Content
UV20 667020 20 mg/l Potassium dichromate in HClO4, (0.1 – 0.3 Abs)
UV40 667040 40 mg/l Potassium dichromate in HClO4, (0.2 – 0.6 Abs)
UV60 667060 60 mg/l Potassium dichromate in HClO4, (0.3 – 0.9 Abs)
UV80 667080 80 mg/l Potassium dichromate in HClO4, (0.4 – 1.2 Abs)
UV0100 6670100 100 mg/l Potassium dichromate in HClO4, (0.5 – 1.5 Abs)
UV0120 6670120 120 mg/l Potassium dichromate in HClO4, (0.6 – 1.8 Abs)
UV0140 6670140 140 mg/l Potassium dichromate in HClO4, (0.7 – 2.0 Abs)
UV0160 6670160 160 mg/l Potassium dichromate in HClO4, (0.8 – 2.3 Abs)
UV0180 6670180 180 mg/l Potassium dichromate in HClO4, (0.9 – 2.6 Abs)
UV0200 6670200 200 mg/l Potassium dichromate in HClO4, (1.0 – 3.0 Abs)
UV600 667600 600 mg/l Potassium dichromate in HClO4, (1.0 bei 430 nm)
UV14 667014 Perchloric acid (HClO4), reference filter
Standard Certification UV20 – UV0200 Wavelengths: 235, 257, 313, 350 nm
Slit width: 2 nm; with DAkkS calibration certificate
Standard Certification UV600 Wavelength: 430 nm
Slit width: 2 nm; with DAkkS calibration certificate
Possible Certification Wavelength: fix
Slit width: all up to 2 nm

 

Note

As the filters are certified individually, measurement results are free from systematic errors made when preparing solutions and with regards to the optical path length of the cuvette. The measurement values of reference filter UV14 (perchloric acid measured against an air blank) appear separately on the DAkkS calibration certificate. To check absorbance linearity, take measurements using Potassium dichromate filters with different concentrations. Plot the absorbance values measured for each filter and wavelength against the measurement values that appear on the DAkkS calibration certificate in a graph.

 

Reference Materials (Brochure & User Manual EN)

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80 Skyline Drive
11803 Plainview, NY
United States

Phone: +1 516 939 0888
info.us@hellma.com
http://www.hellmausa.com

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