University of Minnesota

Ecolab Inc.

Martin P Rigney

Patrick L Coleman

Douglas A Hanggi

Peter W Carr

Eric F Funkenbusch

Wes A Schafer

Richard Jondall Mehus

John Ross Spriggs

Mark Joseph Toetschinger

The present invention provides an arrangement of equipment and an overall process for the measurement and control of active bleach concentration in a bleach environment of an industrial laundry or cleaning system. As a preferred embodiment the primary piece of equipment which renders the overall system especially useful in controlling, for example, hypochlorite ion in a bleach environment is a membrane-shielded amperometric probe. The probe is designed and membrane selected to be highly selective to fluctuations in hypochlorite ion concentration.

Method and apparatus for measuring and controlling active oxygen

The present invention provides a stable stationary phase for chromatography which comprises porous ZrO.sub.2 spherules coated with a cross-linked polymer coating wherein said coated spherules have a pore size from about 20-500 .ANG. and a particle diameter range of about 0.5-500 microns, and are stable in basic media to pHs of up to about 14.

High stability porous zirconium oxide spherules

Growing community of inventors

Roseville, MN, United States of America

Martin P Rigney