Depth Variability and some Geochemical Characteristics of Fe, Mn, Ca, Mg, Sr, S, P, Cd and Zn in Anoxic Sediments from Authie Bay (Northern France)

Metal forms in bottom sediments as a bioavailability indicator

“…The carbonate fraction contained a significant amount of total cadmium and lead content in Poraj reservoir sediment [23] and Povang lake [24], lead in Rybnicki reservoir [25] and in reservoir sediments of Kozłowa Góra [26] and cadmium in sediments analyzed by Yang et al [27]. Our own studies have confirmed the studies of Billon et al [28], proving that metal ions can be absorbed on the carbonated mineral's surface and then incorporated into crystalline structure, eg Cd x Ca 1-x CO 3 . The Cd contribution in the carbonate fraction may be due to the similarity of cadmium and calcium ions.…”

Mineralogical and Chemical Characteristics of Slags from the Pyrometallurgical Extraction of Zinc and Lead

“…At the same time the R 2 value of the trend line is very high: 0.74 for Cu and 0.83 for Zn. Therefore, it can be concluded that both copper and zinc substitute iron in wustite, which is quite common in this type of iron oxides [19][20][21][22]. There are two characteristic relationships in the chemical composition of wustite.…”

Correlations between Geo-Chemical Speciation of Heavy Metals (Cu, Zn, Pb, Cd and Ni) in Surface Sediments and Their Concentrations in Giant Mudskipper (<i>Periophthalmodon schlosseri</i>) Collected from the West Coast of Peninsular Malaysia

“…The bioavailability and subsequent toxicity of the metals are dependent upon various kinds and amounts of the metals bound to the sediment matrices (metal speciation) [6]. It had been found that the speciation of a metal, rather than its total concentration, is the key to understand its effect on the biota [7] (Allen and Hansen, 1996), as well as its biogeochemical transformation and ultimate fate [8] (Billon et al, 2002). Increased discharge of both essential and non-essential metals into natural aquatic ecosystems could expose aquatic organisms to unnaturally high levels of these metals [9] (Van Dyk et al, 2007), thereby causing adverse effects on aquatic ecosystem.…”