Partitioning of cadmium, copper, manganese and iron into mineral and organic fractions in core sediments from the Osaka Bay.

Abstract

Partitioning of cadmium into five fractions (1M CH3000NHo soluble, 1M CH3COOH soluble, 30% H202 soluble, 0.04M NH2OH-HCI soluble and silsicate lattice fractions) of core sediments from the Osaka Bay has been determined by using selective chemical leaching technique. In addition to cadmium, partitioning of copper, manganese and iron has been also examined as a control.Large amounts of heavy metals (cadmium and copper) are contained in the upper parts of the sedi ment. The cadmium and copper contents of the sediment are relatively large in the Bay near the industrial area.Cadmium is distributed mainly in 30% H2O2 soluble and silicate lattice fractions.Cadmium leached into 30% H202 solution may have been partly derived from ferro-manganese oxide fraction as well as pyrite fraction of the sediment.The amount of cadmium contained in silicate lattice fraction of the sediment in the Osaka Bay is larger than that of silicate rocks collected from land area.

Speciation of metals in soils and mobilization by acid‐base treatment

“…Residual contents were obtained by difference. A scheme of the used speciation procedure, derived from Kitano (1980), is shown in Figure 1.…”

“…Speciation of metals, based on their mineralogical distribution, may be achieved by selective extractions in several steps. The usual methods (see, for instance, Kitano, 1980;Tessier, 1979) include an extraction with ammonium acetate at pH = 7.0 (soluble + exhangeable), followed by destruction of carbonates (by acetic acid at pH near to 5.0), releasing of metals associated to organic matter and/or sulphides (by hydrogen peroxide treatment at low pH value) and dissolution of metals associated to some oxides (Fe and Mn), leaving a residual fraction mainly as components of aluminosilicates. This classification seems to be more valuable for explaining soil change phenomena that those (Sillanpää, 1982;Cottenie, 1984) designed to relate the uptake of metals by plants with the selective solubilities in artificial chemical extractants.…”

Cluster and Principal Components Analyses on the Contents of (Total and Sorbed) Trace Metals in Fresh Marine Sediments from the Southwest of the Gulf of Mexico

“…Metals are pivotal to biogeochemical processes, thereby the importance of understanding their partitioning mechanism(s) in marine sediments; particularly so in either mineral surfaces or biological matrices. In the former case, metal sorption in marine sediments will vary depending on pH, redox potential, and the composition of suspended solids (Kitano and Fujiyoshi, 1980;Hakansson et al, 1989;Calmano et al, 1993;Wiechula et al, 2000). In the latter case, metals will interact with organic matter (humic acid), (HS -, S = ), and react with other metals, prior to entering to the trophic chain (Ford and Ryan, 1995;Bosecker, 1997;Schippers and Sand, 1999;Gutjahr et al, 2007;Sparrevik et al, 2009;Scholz et al, 2009).…”

Zinc and copper distribution in soils and their removal by chelating extraction

“…In order to study the distribution of zinc and copper, several sequential extraction methods were reviewed 11 and those proposed by Tessier et al 23 and Kitano and Fujiyoshi 24 were adapted for this study (they were originally established for sediment samples). In this procedure, approximately 2.5 g of each soil sample was introduced to centrifuge tubes.…”