TY - JOUR
T1 - Protonation of carbonate in aqueous tetraalkylammonium salts at 25°C
AU - Piazzese, Daniela
AU - Gianguzza, Antonio
AU - Crea, Francesco
AU - Sammartano, Silvio
AU - De Stefano, Concetta
PY - 2006
Y1 - 2006
N2 - Protonation constants of carbonate were determined in tetramethylammonium chloride (Me4NClaq 0.1≤I/mol kg−1 ≤4) and tetraethylammonium iodide (Et4NIaq 0.1≤I/mol kg−1 ≤1) by potentiometric ([H+]-glass electrode) measurements. Dependence of protonation constants on ionic strength was taken into account by modified specific ion interaction theory (SIT) and by Pitzer models. Literature data on theprotonation of carbonate in NaClaq (0.1≤I/mol kg−1 ≤6) were also critically analysed. Both protonation constants of carbonate follow the trend Et4NI>Me4NCl > NaCl. An ion pair formation model designed to take into account the different protonation behaviours of carbonate in different supporting electrolytes was also evaluated.
AB - Protonation constants of carbonate were determined in tetramethylammonium chloride (Me4NClaq 0.1≤I/mol kg−1 ≤4) and tetraethylammonium iodide (Et4NIaq 0.1≤I/mol kg−1 ≤1) by potentiometric ([H+]-glass electrode) measurements. Dependence of protonation constants on ionic strength was taken into account by modified specific ion interaction theory (SIT) and by Pitzer models. Literature data on theprotonation of carbonate in NaClaq (0.1≤I/mol kg−1 ≤6) were also critically analysed. Both protonation constants of carbonate follow the trend Et4NI>Me4NCl > NaCl. An ion pair formation model designed to take into account the different protonation behaviours of carbonate in different supporting electrolytes was also evaluated.
KW - Aqueous solution
KW - Dependence on ionic strength
KW - Ion pair formation model
KW - Pitzer equation
KW - Protonation of carbonate
KW - Specific ion
interaction theory (SIT)
KW - Tetraalkylammonium salts
KW - Aqueous solution
KW - Dependence on ionic strength
KW - Ion pair formation model
KW - Pitzer equation
KW - Protonation of carbonate
KW - Specific ion
interaction theory (SIT)
KW - Tetraalkylammonium salts
UR - http://hdl.handle.net/10447/61248
M3 - Article
VL - 68
SP - 1102
EP - 1112
JO - Talanta
JF - Talanta
SN - 0039-9140
ER -