Electrochemical measurement of mercury concentration profiles in the pore-waters of sediments of the Venice Lagoon by ion-exchange voltammetry at polymer modified electrodes.
Glassy carbon electrodes modified with coatings of poly-[1-methyl-3-(pyrrol-1-ylmethyl)pyridinium], poly-MPP, were employed for preconcentrating and detecting the anionic complex HgCl4(2-), which is the prevailing inorganic Hg(II) species in salt waters such as the pore-waters of sediments here examined. The application of ion-exchange voltammetry at poly-MPP coated electrodes in combination with an in situ pore-water sampler allowed the measurement of concentration vs. depth profiles for mercury dissolved in the pore-waters of a salt-marsh and of a mud-flat located in a polluted area of the Venice Lagoon. The trends of the mercury profiles are discussed in comparison with the trends measured from the same location for other trace metals (Zn, Cd, Cu and Pb) and reduced species such as S(-II) and Fe(II).
Ugo
Paolo
P
Dipartimento di Chimica Fisica, Università Cà Foscari di Venezia, Calle Larga S. Marta, 2137, 30123 Venezia, Italy. ugo@unive.it
Sperni
Laura
L
Mazzocchin
Gian Antonio
GA
D004563:Electrochemistry / Q000295:instrumentation*; D004566:Electrodes; D019015:Geologic Sediments / Q000737:chemistry*; D007558:Italy; D008628:Mercury / Q000032:analysis*; D011108:Polymers / Q000737:chemistry; D012623:Seawater / Q000737:chemistry*; D014877:Water Pollution, Chemical / Q000032:analysis*
D011108:Polymers; D008628:Mercury