“…The horizontal distributions of trace metal (Al, Fe, Mn, Zn, Cr, Pb, Ni, Cu, As, Cd, and Hg) concentrations in surface sediment around Guem River estuary. ( Shin et al, 2002;Hyun et al, 2003;Hwang et al, 2006;Hyun et al, 2007;Lee et al, 2008;Kim et al, 2012), (National Oceanic and Atmospheric Administration, NOAA) (Kim et al, 2008;Hwang et al, 2010;. .…”