The concentrations of 28 elements in hair of three populations of non-occupationally exposed adults in the US (n = 271) were determined. The 10th, 50th, and 90th percentiles, and geometric means for these data were obtained to define reference intervals for these elements. The effects of various hair treatments, age, and sex on concentrations of 17 selected elements in hair were determined for these populations. Age had little effect on elemental concentrations. Males tended to have higher Cd and Pb levels, but lower Mg and Ti levels than females. Males using dandruff shampoo had significantly higher concentrations of Na, Se, and Ti than those using only regular shampoo and/or conditioners. Ba, Ca, Cu, Mg, Na, and Sr were all elevated in females using permanents or color treatments, compared to those using only dandruff shampoo, regular shampoo, and/or conditioners.
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