TY  - JOUR 
T1  - Potentiometric acidity determination in humic substances influenced by different analytical procedures
JO  - Journal of the Brazilian Chemical Society
A1  - Fernandes, Andreia N.
A1  - Giacomelli, Cristiano
A1  - Giovanela, Marcelo
A1  - Vaz, Denise O.
A1  - Szpoganicz, Bruno
A1  - Sierra, Maria M. D.
SN  - 0103-5053
UL  - 10.1590/S0103-50532009000900021
VL  - 20 
Y1  - 2009
PB  - Brasil 
ER  -