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  • 1 IPEN – CNEN/SP Instituto de Pesquisas Energéticas e Nucleares Av. Prof. Lineu Prestes 2242- Cidade Universitária São Paulo SP 05508-000 Brazil
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In this study, bromine (Br), chlorine (Cl), potassium (K) and sodium (Na) were measured in the blood of Brazilian inhabitants from Southeast (S) and Northeast (N) regions. A reference range was established as a function of sex and considering lifestyle factors (non-smokers and non- drinkers). For both regions lower values of K were found in females when compared to males and lower values of Na were found in males compared to females. Increasing trends for Na and Br were observed in the Northeast region.