Hellma Liquid Calibration
Std Set 667.305-UV 667305
Potassium
dichromate dissolved in perchloric acid is a highly suitable method to check
for photometric accuracy (absorbance) in the UV region. Potassium dichromate
gives a spectral scan containing characteristic peak maxima at 257 nm and 350
nm and minima at 235 nm and 313 nm. The potassium dichromate solution is sealed
in an airtight sealed quartz precision cell with 10 mm light path. The
absorbance values of the filter are determined at the wavelengths 235 nm, 257
nm, 313 nm, and 350 nm and are specified in the certificate. It should be noted
that the measurements are carried out with the filter 667-UV14 (0.01 N
perchloric acid) in the reference beam path.
·
60 mg Potassium dichromate in perchloric acid (667-UV60, wavelength 235;
257; 313; 350 nm)
·
600 mg Potassium dichromate in perchloric acid (667-UV600, wavelength
430 nm)
·
Perchloric acid reference filter (667-UV14, wavelength 235; 257; 313;
350 nm)
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