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Portable water quality instrument

  • US 10,247,673 B2
  • Filed: 08/17/2016
  • Issued: 04/02/2019
  • Est. Priority Date: 04/18/2007
  • Status: Active Grant
First Claim
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1. A method of measuring the amount of an analyte in water, the method comprising the steps of:

  • obtaining a sample of water containing an analyte;

    obtaining a calibration solution, wherein the calibration solution comprises an isotopic calibration standard;

    producing a mixture of the sample, the calibration solution, and Raman-scattering nanoparticles;

    illuminating the mixture with an electric field to produce Raman-spectra of the analyte and the isotopic calibration standard simultaneously; and

    ,performing a ratiometric analysis of the Raman-spectra of the anlayte and the isotopic calibration standard to quantify the analyte,wherein the analyte is selenate and the isotopic calibration standard is a sulfate isotope or a selenate isotope.

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