Behavior and trends for Zn in Saronikos Gulf O. Chalkiadakis, M. Dassenakis, V. Paraskevopoulou and N. Lydakis-Simantiris E3S Web of Conferences, 1 (2013) 32012 Published online: 23 April 2013 DOI: 10.1051/e3sconf/20130132012