XXV Congresso Nazionale
della Società Chimica Italiana
Arcavacata di Rende
07-12 Settembre 2014
ATTI DEL CONGRESSO
Arcavacata di Rende (CS), 7-12 Settembre 2014
XXV Congresso SCI
ANA-O42
Tracing environmental pollution processes in
aquatic systems by Hg isotope ratio
determination
A. Bernia, C. Baschieria, C. Durantea, M.C.Rossia, D. Manzinia,
A. Emilib, F. Rampazzoc, D. Bertoc, T. Fortibuonic, S. Noventac,
S. Covellib, A. Marchettia
a Dipartimento di Scienze Chimiche e Geologiche, Università di Modena e Reggio Emilia,
Via G. Campi 183, 41125 Modena, Italy
b Dipartimento di Matematica e Geoscienze, Università di Trieste, Via Weiss 2, 34128
Trieste, Italy.
c Istituto Superiore per la Protezione e la Ricerca Ambientale, Loc. Brondolo, 30015
Chioggia, Italy
alex.berni@unimore.it
Mercury stable isotopes are an excellent tool to distinguish among different sources of
this element and to investigate its transformation processes in environmental
compartments and in food webs. To do this, an highly precise and sensitive method
was set up by using a cold vapor generator system (CVG) to introduce gaseous Hg0
into a multicollector ICP-MS spectrometer[1], allowing “dry plasma” measurement
conditions to minimize any matrix effect on the obtained results. Instrumental mass
bias on measures was accounted by simultaneously monitoring 205Tl/203Tl from the
isotopic SRM NIST 997 and applying the correction algorithm proposed by Yang and
Sturgeon[2].
This method was applied to the case study of Grado and Marano Lagoon, Italy and of
the northern Adriatic Sea. The lagoon has been subjected to Hg input from both
industrial waste (chlor-alkali plant) and residues of long-term mining activity (Idrija
mine, NW Slovenia) transported by the Isonzo river and marine currents[3].
Mercury isotopic ratios detected on sediments, fish and mollusk tissue samples show
both mass-dependent (MDF) and mass-independent (MIF) fractionation phenomena
for Hg. With these data, it has been possible to gain a more detailed characterization of
the Hg input sources in the lagoon and to gather information on the uptake processes
of the element and its derivatives in living organisms.
[1] D. Foucher, H. Hintelmann, Anal. Bioanal. Chem., 2006, 384,1470-1478.
[2] L. Yang, R. Sturgeon, Anal. Bioanal. Chem. 2009, 393, 377–385.
[3] J. Faganeli, M.E. Hines, S. Covelli, A. Emili, M. Giani, Estuar. Coast. Shelf Sci., 2012,
13, 126-132.
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