Johnson Matthey Public Limited Company

Johnson Matthey Inc.

Duncan William John McCallien

Vincent Brian Croud

David Stubbs

Ian Stuart Edworthy

Darrell Green

Clive Anthony Marchant

Alistair McInroy

Christopher Thomas Llewellyn

David Eustace

Elizabeth Ruth Egginton

Graeme McNay

The invention concerns a method of marking a hydrocarbon liquid comprising the step of adding to said liquid, as a tracer compound, a compound of Formula I or Formula II:wherein at least one of R-Rin Formula I and at least one of R-Rin Formula II is selected from:

Method of marking hydrocarbon liquids

A method of detecting a tracer compound dissolved in a liquid composition via surface-enhanced spectroscopy includes the steps of:

Tracer and method of identifying tracer in product

Method of marking a hydrocarbon liquid includes adding to the liquid, a tracer compound of Formula I or II: wherein at least one of R-Rin Formula I and at least one of R-Rin Formula II is selected from:

A method of identifying a product comprises forming a tagged product by adding to said product a tracer material comprising at least one tracer compound which is acceptable for use as an additive in food and subsequently analyzing a sample of said product to determine the presence of said tracer compound thereby to determine whether said sample is a sample of the tagged product. The method is especially useful for the identification of vegetable oil products from sustainably managed sources. The use of permitted food additives as tracers enables the product to be identified in the supply chain while also allowing it to be used safely in foodstuffs if required.

Tagging method

Method of marking a hydrocarbon liquid includes adding to the liquid a tracer compound of Formula I: wherein, each X is independently hydrogen, bromine, fluorine, a halogenated alkyl group, a linear, branched or cyclic C1-C20 alkyl group, or a phenyl group substituted with one or more halogen atoms, an alkyl group or a halogenated alkyl group; each Y is independently bromine, fluorine, a halogenated alkyl group, a branched or cyclic C1-C9 alkyl group, or a phenyl group substituted with at least one alkyl and/or a halogenated alkyl group; Z is a phenyl group substituted with one or more halogen atoms, an aliphatic or halogenated aliphatic group, a halogenated alkyl group or a linear, branched or cyclic C1-C20 alkyl group, provided that when each Y is a fluorine atom, Z is not a linear or branched C1-C20 alkyl group.

Tracers and method of marking hydrocarbon liquids

A method of measuring the fluorescence of a fluorescent marker compound dissolved or dispersed in a bulk material includes: (a) measuring a characteristic of the fluorescence of a mixture of said bulk material and said fluorescent marker compound; (b) quenching the fluorescence of the fluorescent marker compound to produce a quenched mixture; (c) measuring the characteristic of the fluorescence of the quenched mixture; (d) comparing the fluorescent characteristic of the mixture with the fluorescent characteristic of the quenched mixture; and (e) correcting the measured fluorescent emission characteristic for the effects of the absorbance of the bulk material. The measurement may be further corrected to account for the absorbance of the material which is also known to have an effect on the measured fluorescence. A method of tagging and identifying a bulk material with a fluorescent marker compound, and an apparatus for carrying out the methods are also described.

Growing community of inventors

County Durham, United Kingdom

Duncan William John McCallien