Importance

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Abstract

A simple, convenient method is provided for measuring the concentration of a constituent of an aqueous fluid composition (e.g. aqueous machining fluid composition) and for measuring total alkalinity thereof. The method comprises the steps of a) contacting a solid state test device with the aqueous fluid wherein the solid state test device comprises a plurality of individual spaced apart test regions on an inert support, each test region comprising an inert matrix impregnated with a reagent selectively interactive with the constituent and a color indicator that produces a change in color in response to changes in the test region resulting from interaction between the reagent and the constituent and wherein the amount of reagent in each test region differs in a predetermined manner from the amount of reagent in adjacent test regions, and b) comparing the solid state test device after contact with the aqueous fluid to a constituent concentration color calibration scale for the same reagent, color indicator and constituent.

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First Claim