Patent ID: 9488582
Filing Date: 2016-11-08
CPC Classification: G01N,Y10T

Claim Text:
1. A method comprising: providing a plurality of non-turbid aqueous chlorinated solvent calibration solutions, the calibration solutions comprising solutions of water and a chlorinated solvent, each calibration solution having a concentration of the chlorinated solvent within a predetermined concentration range, at least two of the chlorinated solvent calibration solutions having different concentrations of the chlorinated solvent within the predetermined concentration range; measuring intensity of Raman return at a predetermined Raman shift associated with O—H stretching region of water for each of the plurality of non-turbid aqueous chlorinated solvent calibration solutions; developing a calibration profile for non-turbid solutions relating chlorinated solvent concentrations of the plurality of the non-turbid aqueous chlorinated solvent calibration solutions to the measured intensities; obtaining a non-turbid aqueous solution sample whose chlorinated solvent concentration has to be determined, the sample containing the chlorinated solvent; measuring intensity of Raman return at the predetermined Raman shift associated with O—H stretching region of the non-turbid aqueous solution sample; comparing the intensity of Raman return at the predetermined Raman shift associated with O—H stretching region of the non-turbid aqueous solution sample to the calibration profile for non-turbid solutions; and determining the concentration of the chlorinated solvent in the non-turbid aqueous solution sample.