Optical sensor for the determination of ions
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United States of America Patent
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Nov 7, 2000
Issued Date -
N/A
app pub date -
May 10, 1999
filing date -
Mar 25, 1994
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Abstract
A composition comprising (a) a transparent support (b) which is coated on at least one side with a transparent coating which comprises (b1) a plasticizer-free, hydrophobic polymer having a glass transition temperature Tg of from -150 to 50.degree. C., (b2) counterions in the form of lipophilic salts, (b3) an ionophore which forms a complex with the ion to be determined, and (b4) a compound of the formula I or II as fluorophore ##STR1## in which R.sub.1 and R.sub.3, and R.sub.4 and R.sub.6 are C.sub.1 -C.sub.30 alkyl or C.sub.1 -C.sub.30 alkyl-CO--, and R.sub.2 and R.sub.5 are H or C.sub.1 -C.sub.30 alkyl, with the proviso that the total number of carbon atoms in the alkyl groups is at least 5, or a salt thereof with an inorganic or organic acid. The composition is highly suitable for the qualitative or quantitative optical determination of ions by fluorescence detection.
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