Distribution of Manganese,Nickel,Zinc,Cadmium,and Arsenic in Sediments and in the Standard Elutriate.

摘要

Sequential, selective chemical extraction was used to separate estuarine (Mobile Bay, Ala.), freshwater (Ashtabula, Ohio), and marine (Bridgeport, Conn.) sediments into the fractions (1) dissolved in sediment interstitial water; (2) adsorbed on mineral surfaces; (3) associated with hydrous iron and manganese oxides and hydroxides; (4) associated with sediment organic matter and sulfides; and (5) bound within the lattice of crystalline minerals and the interlayer positions of phyllosilicate (clay) minerals. Separate sediment extractions using the Elutriate Test were also conducted. Manganese, nickel, cadmium, zinc, and arsenic concentrations were determined in each extractant. Nickel, cadmium, zinc, and arsenic concentrations were highest in fractions (5), (4), and (3), respectively. Manganese concentration was highest in fraction (4) in sediments from Mobile Bay and Ashtabula and in fraction (5) in Bridgeport sediment.