Elements affected by size separation procedure Sample Clauses

Elements affected by size separation procedure trivalent and tetravalent metals In the course of filtration and ultrafiltration procedure, aluminum concentration is highly correlated with that of Fe whereas the correlation with OC is detectable only in fractions < 0.22 µm. It is fairly possible that this reflects the presence of both inorganic Fe- Al-rich oxyhydroxides (stabilized by organic matter) and Al- organic matter colloids and LMW complexes; the latter is also demonstrated by Dia et al., 2000. The correlation between Ga and Fe is rather poor in the filtrates of river waters but much better in the feeding bog (KAR-2); the correlation of this element with OC is rather weak. Yttrium and Light Rare Earth Elements (LREEs) such as Y, La-Sm exhibit very good correlation with Fe; this correlation decreases for medium XXXx (Eu-Er) and becomes absent for Heavy Rare Earth Elements (HREEs) such as Tm-Lu. At the same time, HREE are better correlated with organic carbon, notably in the LMW fraction. This observation, documented both for Vostochniy stream and Palojoki river nicely corroborates the previous results of the high affinity of the LREEs to mineral surfaces and HREEs to the organic ligands known both from laboratory experiments (Xxxxx and Xxx, 1990; Koeppenkastrop and Xx Xxxxx, 1992, 1993; De Carlo, 1998; Bau, 1999) and natural observations (Xxxxxxxxxx, 1995; Xxxxx, 2004; Xxxxxxxxx et al., 2006; Xxxxxxx et al., 2007; Xxxxxx et al., 2008). Among insoluble tetravalent elements, Ti, Zr and Th are well correlated with Fe in filtrates and ultrafiltrates, especially in soil solution; Th is also correlated with OC although this dependence is less pronounced than that with Fe. Good correlation of Th with DOC in different size fraction filtrates was also demonstrated by Xxx et al. (2000).
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