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
2009-06-18
2011-11-29
Sines, Brian J (Department: 1772)
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Content or effect of a constituent of a liquid mixture
C210S749000, C210S754000, C210S756000, C210S764000, C210S765000, C436S111000, C436S113000, C436S125000, C422S068100
Reexamination Certificate
active
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.
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Cochran Freund & Young LLC
Freund Samuel M.
Hach Company
Sines Brian J
Wecker Jennifer
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