(Table 1) Speciation of metals in the surface layer of bottom sediments from the Ob and Yenisei estuaries and the southern Kara Sea@en

Element contents for dry sediment matter are shown. Adsorbed fraction - leached with acetate buffer (pH 4.8). Fraction combined with amorphous Fe-hydroxides and Mn-oxyhydroxides - leached according to Chester and Hughes (1967; doi:10.1016/0009-2541(67)90025-3). Fraction combined with organic matter and sulfides - leached according to Kitano and Fujiyoshi (1980; http://www.terrapub.co.jp/journals/GJ/pdf/1403/14030113.PDF).