[Lead level of the hair in persons occupationally exposed to it in selected work places].

The concentration of lead was determined in the hair of 69 occupationally exposed and 55 non-exposed subjects. The mean lead content in the three selected occupationally exposed groups was 17.48, 29.03 and 25.74 micrograms/respectively, significant differences being found between some of them. The mean lead content in the hair of unexposed population was 4.20 micrograms/g. Statistical analysis of the results demonstrated a highly significant difference in mean lead levels between exposed and non-exposed groups. The subjects occupationally exposed to lead and its compounds exhibited no significant correlation between lead concentrations in hair and delta-aminolevulinic acid concentrations in urine.