Environmental Test Systems, Inc.

Kenneth A Blake

James E Christner

Chauncey O Rupe

Carol Ann Terry

Leonard J Lucchese, Ii

Flexible taco food pouch

A test method and device is described for determining biguanides in aqueous fluids such as swimming pool water which involve contacting the fluid with a matrix incorporating a pH sensitive indicator material which exhibits the biguanide error effect. A buffer is advantageously used to maintain the test system within a defined constant pH range to eliminate the effect of pH changes on the test system.

Method and device for the determination of polymeric biguanides in

A unitized multilayer dry reagent analytical chemistry test structure and device and method of fabricating such device is described. The device includes two or more contiguous layers of absorbent or porous paper or polymeric material, at least one of which is incorporated with a test reagent composition, the layers attached to each other with intermediate porous attachment layers by fusion bonding. When the device is contacted with the fluid being tested the attachment layers allow the free flow of such fluid from one layer to the next.

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Elkhart, IN, United States of America

Kenneth A Blake