The stabilities of several tracers were tested under geothermal conditions while in j e ction- backflow tests were conducted at East Mesa. The tracers I and B r were injected continuously while SCN (thiocyanate), B, and disodium fluorescein were each injected as a point source (slug). The tracers were shown to be stable, except where the high concent ration s used during slug injection induced adsorption of the slug tracers. However, adsorption of the slug tracers appeared to ëarmorí the formation against adsorption during subsequent tests. Precipitation behavior of calcite and silica as well as Na/K shifts during injection are also discussed.

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