Monitoring trace elements (Al, As, Cr, Cu, Fe, Mn, Ni and Zn) in deep and surface waters of the estuary of the Nerbioi-Ibaizabal River (Bay of Biscay, Basque Country)

1. Fernández, S.
2. Villanueva, U.
3. de Diego, A.
4. Arana, G.
5. Madariaga, J.M.