Aqueous solution based on an azo dye, process for its manufacture and use thereof
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United States of America Patent
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Aug 17, 2004
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N/A
app pub date -
Sep 8, 1999
filing date -
Sep 9, 1998
priority date (Note) -
Expired
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Abstract
The present invention relates to a stable aqueous solution (A) comprising an azo dye, a borate buffer and one or more masking agents, wherein the azo dye changes its coloration or coloration intensity in the presence of chlorine dioxide. The present invention further relates to a process for manufacturing the aqueous azo-dye solution (A), and to its use for the determination of residual chlorine dioxide in water.
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