Composition, test device and method for determining the ionic strength or specific gravity of a liquid sample utilizing a strong polyelectrolyte
AssigneeMiles Laboratories, Inc.
InventorsSisto N. Stiso, Rodric H. White-Stevens
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Abstract
A composition is disclosed for determining the ionic strength or specific gravity of an aqueous test sample, the composition comprising a strongly acidic or strongly basic polyelectrolyte, a buffer substance capable of providing a pH of about 5.5, and an indicator means capable of producing a detectable response to ion exchange between the polyelectrolyte and the sample. The test device comprises a carrier matrix incorporated with the test composition, and the method for its use comprises contacting an aqueous test sample with the device and observing a detectable response.
Claims22
A composition capable of producing a detectable response indicative of the specific gravity of a liquid test sample, said composition comprising:
- a strongly acidic or strongly basic polyelectrolyte polymer,
- a buffer substance capable of providing a pH of at least about 5.5, and
- a pH indicator compound.
A composition capable of producing a detectable response indicative of the specific gravity of a liquid test sample, said composition comprising poly(styrene sulfonic acid), phosphate, and bromthymol blue.
A test device capable of producing a detectable response indicative of the specific gravity of a liquid test sample, the device comprising a carrier matrix incorporated with
- a strongly acidic or strongly basic polyelectrolyte polymer,
- a buffer substance capable of providing a pH of at least 5.5, and
- a pH indicator means.
Dependencies are inferred from the claim text.