US 6,638,480 B2 · High sensitivity test system for the colorimetric determination of specific gravity or total dissolved solids in aqueous samples

Abstract

A highly sensitive and convenient test method, composition and device for the facile calorimetric determination of total dissolved solids in an aqueous sample having a low specific gravity is presented. The reagent composition comprises the mixture of a complex of a positively charged polyelectrolyte and a negatively charged indicator material, and an appropriate buffer system for maintaining the test system environment at an exact pH depending upon the indicator material selected. A preferable embodiment of this test system comprises the incorporation of the test composition into or with a solid state matrix material such as bibulous paper. The test system is particularly useful in the field testing of potable and recreational waters.

Claims6

Dependent claims

A test device for the determination of total dissolved solids in an aqueous sample having a low specific gravity comprising the dried residue of a solution of a test composition, said test composition comprising:

a. a complex of thymol blue and poly(vinylbenzyltrimethylammonium hydroxide);
b. a buffer system for maintaining the mixture of the test composition and the aqueous sample at an exact predetermined pH;
and
c. a solid water insoluble matrix material, where the dried residue is incorporated into the matrix material.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

09/729,157Filed 1 Dec 2000

Published

US 2002/0102740 A11 Aug 2002

Granted

28 Oct 2003

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

G01N 31/22
Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted…
G01N 33/52
Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing: use of…
G01N 33/521
Use of compounds or compositions for colorimetric, spectrophotometric or fluorometric investigation, e.g. use of reagent paper and including…:…
Y10S 436/808
Apparatus included in process claim, e.g. physical support structures: automated or kit

High sensitivity test system for the colorimetric determination of specific gravity or total dissolved solids in aqueous samples

Life of this patent

High sensitivity test system for the colorimetric determination of specific gravity or total dissolved solids in aqueous samples

Life of this patent

Abstract

Claims6