Holmium liquid filter (240 - 650 nm)

for checking the wavelength accuracy

The Holmium liquid filter consists of a solution of Holmium oxide dissolved in perchloric acid. This filter is ideally suited for checking the wavelength accuracy of spectrophotometers in the UV and visible range. It has a spectrum with a variety of characteristic, very well-defined peaks in the range between 240 nm and 650 nm.

This filter is recommended in the Ph. Eur. and in the USP for checking the wavelength accuracy in the range of 240 - 650 nm.

Note:
The Ph. Eur. requires that all measurements are carried out with reference to the same solvents (blank) for the background correction. That means for checking the wavelength accuracy with Holmium in perchloric acid (UV5), the solvent (blank) perchloric acid (UV14) must be used as reference.

Ph. Eur. = European Pharmacopoeia
USP = United States Pharmacopeia

Typical spectrum of Holmium Oxide dissolved in Perchloric Acid, measured at a slit width of 1 nm

 

ARTICLE-NO. 667005    Request this article
APPLICATION Checking the wavelength accuracy according to Ph. Eur. in the UV and Vis range
CONTENT Holmium oxide in perchloric acid
STANDARD MEASUREMENT Wavelengths: 241, 287, 361, 451, 485, 536, 640 nm
Slit width: 1 nm; with DAkkS calibration certificate
POSSIBLE MEASUREMENTS Wavelengths: 241, 250, 278, 287, 333, 345, 361, 386, 416, 451, 468, 485, 536, 640 nm
Slit width: 1 - 2 nm

 


ARTICLE-NO. 667005USP    Request this article
APPLICATION Checking the wavelength accuracy according to USP<857> in the UV and Vis range
CONTENT Holmium oxide in perchloric acid
STANDARD MEASUREMENT Wavelengths: 241, 250, 278, 287, 333, 345, 361, 386, 416, 451, 468, 485, 536, 640 nm
Slit width: 1 nm; with DAkkS calibration certificate
POSSIBLE MEASUREMENTS Slit width: 1 - 2 nm

 

Optical Reference Materials (Brochure & User Manual EN)

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