Detection of free chlorine in water

Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Content or effect of a constituent of a liquid mixture

Reexamination Certificate

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C210S749000, C210S754000, C210S756000, C210S764000, C210S765000, C436S111000, C436S113000, C436S125000, C422S068100

Reexamination Certificate

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08065906

ABSTRACT:
The present invention describes methods and kits for determining the concentration of free chlorine in water. To avoid false readings from other species present in the water, the free chlorine is reacted with ammonia to form monochloramine, which is then reacted to form an indophenol or an indonaphthol. The concentration of the indophenol or indonaphthol is proportional to the total monochloramine present. Subtracting the concentration of residual monochloramine from the total monochloramine yields the concentration of monochloramine formed from the free chlorine and ammonia, and is proportional to the concentration of free chlorine. Embodiments of the present invention will simplify and accelerate accurate measurements of free chlorine in water, without interference from compounds impacting present measurements of free chlorine.

REFERENCES:
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patent: 2003/0232447 (2003-12-01), Kahle
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Water Research Foundation, “Research Applications: Research in Use” Aug. 1999, pp. 1-4, online: http://www.waterresearchfoundation.org/research/TopicsAndProjects/Resources/caseStudies/researchappsChloram.aspx.
International Search Report for PCT/US09/47859, International Searching Authority, Aug. 7, 2009, pp. 1-12.
White, “Handbook of Chlorination,”Van Nostrand/Reinhold, 3rd Ed., New York, pp. 589-606 (1993).
Yoon and Jensen, “Chlorine Transfer from Inorganic Monochloramine in Chlorinated Wastewater,” Water Environ. Res., vol. 67, No. 5, 1995.
Isaac and Morris, “Transfer of Active Chlorine from Chloramine to Nitrogenous Organic Compounds,” Environ. Sci. Technol. 17, 1983.

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