Tracers

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The invention provides the use of at least one sparingly soluble ionic metal compound, each comprising a metal ion and at least one anion, in monitoring and/or validating the use of at least one chemical treatment agent in a subterranean reservoir. Typical compounds include oxides, sulphides, phosphates and molybdates of rare earth elements or yttrium. The inventions also provides a corresponding method for monitoring and/or validating the use of at least one chemical treatment agent in a subterranean reservoir. Tracer sources comprising at least one sparingly soluble ionic metal compound bound with a binder such as a polymer are also provided.