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Sol-gel-derived optical coatings for determination of chromate

DOI to cite this document:
Zevin, Michael ; Reisfeld, Renata ; Oehme, Ines ; Wolfbeis, Otto S.
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Date of publication of this fulltext: 20 May 2011 06:31


An optical probe for chromate ion has been obtained by the sol-gel technique by depositing a porous film containing the reagent diphenylcarbazide on a glass support. Changes in the absorption of light as a result of the (irreversible) formation of a purple product between chromate and the reagent inside the sol-gel are monitored. The detection limit for chromate anion is as low as 1 ppb, but only ...


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