Didymium liquid filter (320 - 870 nm)

for checking the wavelength accuracy

The didymium liquid filter consists of praseodymium and neodymium, 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 320 nm and 870 nm.

This filter is recommended in the Ph. Eur. and in the USP 857 for checking the wavelength accuracy above 640 nm.

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

 

Typical spectrum of Didymium (praseodymium and neodymium) dissolved in perchlroic acid measured at a slit width of 1 nm.

 

ARTICLE-NO. 667025    Request this article
APPLICATION Checking the wavelength accuracy in the UV and Vis range
CONTENT Didymium in perchloric acid
STANDARD MEASUREMENT Wavelengths: 329, 469, 575, 740, 864 nm
Slit width: 1 nm; with DAkkS calibration certificate
POSSIBLE MEASUREMENTS Wavelengths: 329, 354, 444, 469, 482, 512, 522, 575, 732, 740, 794, 801, 864 nm
Slit width: 1 - 2 nm

 

ARTICLE-NO. 667025EPUSP    Request this article
APPLICATION Checking the wavelength accuracy according to Ph. Eur. and USP <857> in the Vis range above 640 nm
CONTENT Didymium in perchloric acid
STANDARD MEASUREMENT Wavelengths: 512, 732, 740, 794, 801, 864 nm
Slit width: 1 nm; with DAkkS calibration certificate
POSSIBLE MEASUREMENTS Slit width: 1 - 2 nm

 

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