Author(s):
Catarino, Sofia 
; Madeira, M. ; Monteiro, F. ; Rocha, F. ; Curvelo-Garcia, A.S. ; Sousa, R.Bruno
Date: 2008
Persistent ID: http://hdl.handle.net/10400.5/5606
Origin: Repositório da UTL
Subject(s): wine; contaminant elements; bentonite physical and chemical characteristics; ICP-MS
Description
Physical, chemical, and mineralogical characteristics of six bentonites were assessed and related to
their elemental release to wine. Extraction essays of bentonites in wine at three pH levels were carried
out. The multielemental analysis of bentonites and wines was performed by atomic absorption
spectrometry (AAS) and inductively coupled plasma mass spectrometry (ICP-MS). Bentonite addition
resulted in significantly higher concentrations of Li, Be, Na, Mg, Al, Ca, Sc, V, Mn, Fe, Co, Ni, Ga,
Ge, As, Sr, Y, Zr, Nb, Mo, Cd, Sn, Sb, Ba, W, Tl, Bi, and W. In contrast, the concentrations of B, K,
Cu, Zn, and Rb significantly decreased. A strong correlation between Na concentrations of treated
wines and its content in bentonite exchange complex was observed. Al and Fe contents reflected
bentonite extractable aluminous and ferruginous constituents, while Be, Mg, Ca, V, Mn, Ni, Ge, Zr,
Nb, Mo, Sn, Sb, Tl, Pb, and U concentrations reflected the elemental composition of bentonites.
Several nonconformances with OIV specifications demonstrated the need for an effective control.
