Abstract
Evaluation of trace metals in human tissues such as hair and nails has proven useful in the studies pertaining to chronic body exposure. These have also been suggested as indexes to evaluate environmental exposure by toxic trace metals. Though hair have been more extensively studied than finger nails, yet it remains that the latter tissue is equally promising in the characterization of certain diseases and abnormalities. These studies reveal continued interest in trace elements in the devitalized human tissues. The authors conducted earlier a survey of trace elements in human hair and in continuation of this study the present communication reports the data on trace elements in human nails in populations of diverse regions. Over 500 specimens drawn from Japan, India, Poland, Canada and U.S.A. were analyzed for 21 trace elements. An attempt has also been made to differentiate trace elements distributed according to age, sex and living habits of the donors.
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