G - Physics – 01 – N
Patent
G - Physics
01
N
150/19, 150/7
G01N 9/36 (2006.01) G01N 9/00 (2006.01) G01N 33/50 (2006.01) G01N 33/52 (2006.01)
Patent
CA 1210677
ABSTRACT A test means, test device, and method for deter- mining the ionic strength or specific gravity of a test sample as well as a method for making the device, are disclosed. The test means comprises a weakly acidic polyelectrolyte polymer, at least 50 percent of the carboxyl groups of which are present in the form of the salt of a quaternary ammonium ion having the structure Image in which the R substituents, same or different, are hydrogen, lower alkyl or aryl, with the proviso that at least one of R is other than hydrogen; and an indicator means capable of producing a detectable response to ion exchange between the polyelectrolyte salt and the test sample. The device comprises a carrier matrix incorporated with the test means. The method for determining the ionic strength or specific gravity comprises contacting the test sample with the test means or device and observing a detectable response. The method for making the device comprises the steps of reacting the weakly acidic polyelectrolyte polymer with sufficient quaternary ammonium hydroxide to neutralize at least 50 percent of the carboxyl groups to form a polyelectrolyte salt, and incor- porating the salt and a pH indicator with a carrier matrix.
440189
Miles Laboratories Inc.
Osler Hoskin & Harcourt Llp
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