Method of analysis for aqueous fluids
First Claim
1. In a method of measuring the concentration of a constituent of an aqueous fluid composition the steps comprising a) contacting a solid state test device with the aqueous fluid composition, the solid state test device comprising an inert support and a plurality of individual spaced apart test regions on the support, wherein each test region comprises 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 the 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, whereby correspondence is determined between a pattern of resultant colors of the test regions and a constituent concentration represented by the constituent concentration color calibration scale.
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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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Citations
20 Claims
- 1. In a method of measuring the concentration of a constituent of an aqueous fluid composition the steps comprising a) contacting a solid state test device with the aqueous fluid composition, the solid state test device comprising an inert support and a plurality of individual spaced apart test regions on the support, wherein each test region comprises 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 the 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, whereby correspondence is determined between a pattern of resultant colors of the test regions and a constituent concentration represented by the constituent concentration color calibration scale.
- 10. In a method of measuring the concentration of a constituent of an aqueous machining fluid composition, the steps comprising a) contacting a solid state test device with the aqueous machining fluid composition, the solid state test device comprising an inert support and a plurality of individual spaced apart test regions on the support, wherein each test region comprises an inert matrix impregnated with a reagent selectively interactive with the constituent and a color indicator that produces a color change in response to the 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 machining fluid to a constituent concentration color calibration scale, whereby correspondence is determined between a pattern of the resultant colors of the test regions and a constituent concentration represented by the constituent concentration color calibration scale.
- 16. In a method of measuring the total alkalinity of an aqueous machining fluid composition the steps comprising a) contacting a solid state test device with the aqueous machining fluid composition, the solid state test device comprising an inert support and a plurality of individual spaced apart test regions on the support, wherein each test region comprises an inert matrix impregnated with an acid reagent selectively interactive with the alkaline constituents of the aqueous machining fluid and an acid-base color indicator that produces a color change in response to the changes in the test region resulting from interaction between the acid reagent and the alkaline constituents of the aqueous machining fluid and wherein the amount of the acid reagent in each test region differs in a predetermined manner from the amount of acid reagent in adjacent test regions and b) comparing the solid state test device after contact with the aqueous machining fluid to a total alkalinity color calibration scale, whereby correspondence is determined between a pattern of the resultant colors of the test regions and a total alkalinity represented by the total alkalinity color calibration scale.
Specification