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Safety in the scanning electron microscopy laboratory--1984 update.

Recent information on hazards as they relate to safety in the SEM laboratory has been compiled. The paper concentrates on recent information on formaldehyde, embeddants, and a reminder of the possible hazards of photographic chemicals. A review of formaldehyde does not substantiate it as a human carcinogen or mutagen. However, the other hazards associated with it suggest that formaldehyde needs to be handled with care. The recent substantiation of epoxy resins as mutagens suggests that all operations involving embeddants should be undertaken in an effective fume hood. Other precautions are also important. The hazards of photographic chemicals need to be reiterated. It should also be pointed out that adequate ventilation of dark rooms would do a lot to reduce this hazard.