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developed adverse health effects, such as lung cancer or infertility problems, from the Army's releases of zinc cadmium sulfide.

7. What is the effect of repeated exposure to zinc cadmium sulfide?

There have been no studies on the toxic effects of repeated exposure to zinc cadmium sulfide. If we assume a worst-case scenario—that exposure to zinc cadmium sulfide will have the same effect as exposure to an equivalent amount of cadmium—then repeated exposures to zinc cadmium sulfide could cause kidney and bone toxicity and lung cancer. However, exposures from the Army's zinc cadmium sulfide tests involved small amounts for short duration; therefore, such effects are highly unlikely.

8. Are any members of the population especially sensitive to zinc cadmium sulfide?

Differences in sensitivity to zinc cadmium sulfide have not been studied. It is extremely unlikely that zinc cadmium sulfide could enter the bloodstream of any person, including sensitive people, such as infants, children, and the elderly, from exposure of the skin, lungs, or digestive tract. That is because zinc cadmium sulfide does not dissolve in water or fats, and it dissolves only slightly in strong acids. Therefore, it is not likely to pass through the skin or enter the bloodstream if it is swallowed in food or water containing it. On the basis of the available data, if people, including sensitive people, swallow zinc cadmium sulfide, it will most likely pass through their bodies and be excreted in their feces. Like other dust particles in air, particles of zinc cadmium sulfide are likely to deposit in the lungs of all individuals, including sensitive people, if they breathe air contaminated with it. Most of the inhaled zinc cadmium sulfide will be exhaled, and only a small percentage of it will be deposited in the lungs. Most of the deposited zinc cadmium sulfide will be cleared from



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