The subcommittee believes that the results of these studies are not relevant to zinc cadmium sulfide exposures for two reasons. First, ZnCdS is a sintered compound. The sintered compound reportedly does not contain free zinc sulfide or cadmium sulfide, be- cause the sintering process is highly efficient. Second, in the unlikely event that ZnCdS breaks down into its components, the exposure would be to such small amounts of the components, a biological response is unlikely. Therefore, the subcommittee concluded that copper toxicity from the Army's tests should not be a concern.
Silver is only toxic at high levels.
Recommended Dietary Al lowances. 9th Rev. Ed. National Academy Press 185pp. Oldiges, H., and U. Glaser. The inhalative toxicity of different cadmium compounds in rats.