Colored reagent complex and method of detecting a rust removing agent in metal working fluids using the same
AssigneeNorthern Technologies International Corporation
InventorIldiko McCloskey-Lini
Life of this patent
Estimating the term…
Abstract
Methods for detecting an amount of a rust removing agent in a sample are disclosed, the methods using a colored reagent complex formed from a reaction of a transition metal salt and a salicylate salt or acid, or a derivative thereof. A method includes making a test sample solution comprising the sample and the colored reagent complex, evaluating the visible color and/or absorption value of the test sample solution, and comparing the visible color and/or absorption value of the test sample solution to the visible color and/or absorption value of a reference solution containing a known amount of rust removing agent.
Claims20
A method of detecting an amount of a rust removing agent in a sample, the method comprising the steps of:
- forming a colored reagent complex from a reaction of a transition metal salt and a salicylate salt or acid, or a derivative thereof;
- preparing a first reagent solution comprising the colored reagent complex, wherein the first reagent solution is substantially the same visible color as the colored reagent complex;
- adding the sample to the first reagent solution to make a test sample solution;
- and
- evaluating the color or absorbance of the test sample solution to detect the amount of rust removing agent in the sample.
Dependencies are inferred from the claim text.