TY  - JOUR 
T1  - Comparison of different pre-treatment procedures for the determination of chromium in crude oil samples by GF AAS
JO  - Journal of the Brazilian Chemical Society
A1  - Pessoa, Helen M.
A1  - Lyra, Fernanda H.
A1  - Castro, Eustáquio Vinicius R. de
A1  - Campos, Reinaldo C. de
A1  - Carneiro, Maria Tereza W. D.
A1  - Brandão, Geisamanda P.
SN  - 0103-5053
UL  - 10.1590/S0103-50532012005000004
VL  - 23 
Y1  - 2012
PB  - Brasil 
ER  -