Potassium dichromate liquid filter

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 Abs at 430 nm)
UV14	667014	Perchloric acid (HClO4), reference filter

Standard Measurement	UV20 – UV0200 Wavelengths: 235, 257, 313, 350 nm Slit width: 2 nm; with DAkkS calibration certificate
Standard Measurement	UV600 Wavelength: 430 nm Slit width: 2 nm; with DAkkS calibration certificate
Possible Measurements	Wavelength: fix Slit width: 1 and 2 nm

Note

As the filters are measured 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 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 calibration certificate in a graph.

Optical Reference Materials (Brochure & User Manual EN)

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Hellma USA Inc.
120 Terminal Drive
11803 Plainview, NY
United States

Phone: +1 5169 3908 88
info.us@hellma.com
www.hellmausa.com

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