Method of identifying a material

摘要

The invention concerns a method of measuring the amount of a particular SERS-active taggant compound in a sample of a material which includes the steps of adding an internal standard containing an isotopically-altered version of said SERS-active taggant compound to the sample, contacting the sample/internal standard mixture with a SERS substrate then subjecting the mixture and SERS substrate to Raman spectroscopy. The concentration of SERS-active taggant compound in the sample is then calculated from the ratio of (i) the Raman spectroscopy detector response to the SERS-active taggant compound to (ii) the Raman spectroscopy detector response to the internal standard.

主权项

1. A method of measuring the amount of a particular SERS-active taggant compound in a sample of liquid comprising the steps of:—
a) adding to said sample an internal standard comprising an isotopically-altered version of said SERS-active taggant compound; b) contacting said sample containing said internal standard with a SERS substrate; c) subjecting said sample and SERS substrate to Raman spectroscopy; and d) calculating the ratio of (i) the Raman spectroscopy detector response to the SERS-active taggant compound to (ii) the Raman spectroscopy detector response to the internal standard.