By Tim Cooke on Wednesday, May 10, 2000 - 01:22 am:
Does anyone know of a suitable (readily available and inexpensive) water soluble compound that absorbs at around 350nm?
We are in the process of revising our detector wavelength verification procedure from using holmium perchlorate (which is expensive, corrosive and doesn't cover below 240nm), to using caffeine which covers 205nm and 273nm, but nothing higher.
Potassium Chromate absorbs at 372nm, but this is so close to the upper limit for a D2 lamp that there's practically no energy given out.
By Anonymous on Monday, May 15, 2000 - 09:29 am:
Tim
It may not be the best option, but one possibility is minocycline ( a tetracylcine). It has strong absorbance bands at ~220, 265, and 350 nm. It is very water soluble. You may need to define "cheap". Minocycline HCl goes for ~$60 for 250 mg (Sigma). Cheaper than some, more expensive than others. Good luck.
Ray
By B.Buglio on Tuesday, May 23, 2000 - 07:00 pm:
Consider erbium perchlorate - it has maxima at
356,364 and a strong 379 nm.
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