Johnson Matthey Public Limited Company

Johnson Matthey Inc.

Ian Stuart Edworthy

Vincent Brian Croud

Duncan William John McCallien

Duncan McCallien

Duncan William Mccallien

Brian Vincent Croud

Duncan William John Mccallien

Method of marking a hydrocarbon liquid includes: adding thereto, a tracer compound of Formula I:wherein,

Tracers and method of marking liquids

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.

Method and apparatus for measuring fluorescence in liquids

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Tyne and Wear, United Kingdom

Ian Stuart Edworthy