TY  - JOUR 
T1  - ION EXCHANGE MECHANISM OF Cr+3 ON NATURALLY OCCURRING CLINOPTILOLITE
JO  - Brazilian Journal of Chemical Engineering
A1  - Barros, M.A.S.D. de
A1  - Machado, N.R.C.F.
A1  - Alves, F.V.
A1  - Sousa-Aguiar, E.F.
SN  - 0104-6632
UL  - 10.1590/S0104-66321997000300006
VL  - 14 
Y1  - 1997
PB  - Brasil 
ER  -