Process to measure PPB levels of dissolved copper in jet fuels and other non-aqueous fluids using a colorimetric process
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsGreg E. Collins, Robert E. Morris
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Abstract
A method of measuring the concentration of metal ions in a sample comprising the steps of: providing a sample comprising a nonpolar, liquid hydrocarbon, suspected of containing a metal ion; adding a dye such as a spirobenzopyran dye or bathocuproine and a reducing agent to the sample; wherein the dye forms a complex with the metal ion; wherein the complex has a spectral shift in light absorbance relative to the dye; observing the spectral shift; and calculating the concentration of the metal ion in the sample.
Claims33
A method of measuring the concentration of metal ions in a sample comprising the steps of:
- providing a sample comprising a nonpolar, liquid hydrocarbon, suspected of containing a metal ion;
- adding a spirobenzopyran dye to the sample;
- wherein the spirobenzopyran dye forms a complex with the metal ion;
- wherein the complex has a spectral shift in light absorbance relative to the spirobenzopyran dye;
- observing the spectral shift;
- and
- calculating the concentration of the metal ion in the sample.
A method of measuring the concentration of copper ions in a sample comprising the steps of:
- providing a sample comprising a nonpolar, liquid hydrocarbon, suspected of containing a copper ion;
- adding bathocuproine and a reducing agent to the sample to create a spectral shift in light absorbance caused by complexation of the bathocuproine to the metal ion;
- observing the spectral shift;
- and
- calculating the concentration of the copper ion in the sample.
A method of measuring the concentration of metal ions in a fuel sample comprising the steps of:
- providing a sample comprising a fuel suspected of containing a metal ion;
- adding a dye to the sample;
- wherein the dye forms a complex with the metal ion;
- wherein the complex has a spectral shift in light absorbance relative to the dye;
- observing the spectral shift;
- and
- calculating the concentration of the metal ion in the sample.
Dependencies are inferred from the claim text.