Origin of the difference in the distribution behavior of tellurium and selenium in a soil–water system

Molecular-scale mechanisms of distribution and isotopic fractionation of molybdenum between seawater and ferromanganese oxides

“…In this framework, we suggested that the surface complex structure is a key factor because it affects the distribution between solid and aqueous phases. Their relationship is also pointed out for the other trace elements forming oxyanions in various environments (Peak and Sparks, 2002;Mitsunobu et al, 2006;Harada and Takahashi, 2008;Kashiwabara et al, 2008). Harada and Takahashi (2008) reported that Se is more soluble to the aqueous phase than Te in the soil-water system because Te(IV), Te(VI) and Se(IV) form inner-sphere complexes on Fe(III) (oxyhydr)oxides whereas only Se(VI) forms an outer-sphere complex.…”

“…Their relationship is also pointed out for the other trace elements forming oxyanions in various environments (Peak and Sparks, 2002;Mitsunobu et al, 2006;Harada and Takahashi, 2008;Kashiwabara et al, 2008). Harada and Takahashi (2008) reported that Se is more soluble to the aqueous phase than Te in the soil-water system because Te(IV), Te(VI) and Se(IV) form inner-sphere complexes on Fe(III) (oxyhydr)oxides whereas only Se(VI) forms an outer-sphere complex. They also suggested that the large difference in enrichment factors of Te and Se into ferromanganese oxides may be due to the formation of inner-and outer-sphere complexes, respectively .…”

The distribution, enrichment and source of potential harmful elements in surface sediments of Bohai Bay, North China

“…Hence, although these elements except for V are found in relatively low abundances, it is possible that the high toxicities of these elements can induce environmental problems [9].…”

Environmental chemistry: a discipline standing on two shoulders

“…Although examples are probably not necessary here, let us consider, for instance, the elegant example provided in Harada and Takahashi, [24] where the different behaviour of Se and Te in seawater is explained by the different inner v. outer sphere complexation behaviour towards ferrihydrite of these otherwise similar elements (Fig. 1).…”