Selenium (IV) and (VI) levels in potable, irrigation and waste waters from an industrial zone in southeastern Spain

Speciation of selenium in groundwater: Seasonal variations and redox transformations

“…In all these samples, Se(VI) was the dominant species of Se. This is in agreement with other published results [9,16,27,28], and also in accordance with the thermodynamic predictions for oxidizing groundwaters. Another reason for the predominance of Se(VI) species is the alkaline sample pH with high bicarbonate concentrations (73-650 mg L −1 ).…”

Selenium and Heavy Metal Levels in Vegetables and Tissues of Three Non-Migratory Birds Exposed to Soil, Water, and Aquatic Sediment Contaminated With Seleniferous Raša Coal

“…7) did not exceed the levels prescribed by the drinking water guideline. Diaz et al (1996) reported average total Se values (0.24 ± 0.07 g/L) in potable waters from an industrial zone in southeastern Spain, which are much lower than 1 g/L total Se in Raša tap water. On the other hand, Mo, U, Se, Pb, Al, Mn, and Fe in estuary and seawater samples are well above the world seawater values reported by Reimann & de Caritat (1998).…”

“…4-6 (see Table 1), the pertaining sites should be inspected, preferably subjected to phytoremediation (Sasmaz & Obek, 2009;Zacchini et al, 2009) or bioremediation (Singh et al, 2012;Sharma et al, 2017), and monitored afterwards. Diaz et al (1996) reported average total Se values in waste waters and irrigation waters in Spain as follows: 0.13 ± 0.08 g/L, and 0.17 ± 0.14 g/L, respectively. The authors also compared them with relevant values in Belgium (0.35 g/L), England (1.1-3.3 g/L), Israel (0.44 g/L), Germany (0.12 g/L), the Netherlands (0.12 g/L), and New York (<0.2 g/L).…”

Determination of selenium species in seawater by flow injection hydride generation in situ trapping followed by electrothermal atomic absorption spectrometry†

“…For natural waters, various procedures to transform Se VI and organic Se 2II to Se IV have been proposed such as thermal or photochemical treatments but these treatments were very dependent on medium and experimental conditions and sometimes contradictory. [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] In the first part of this study, we optimized the experimental conditions for the determination of Se IV by flow injection hydride generation, in situ trapping onto iridium followed by ETAAS; in the second part we investigated different physicochemical treatments to transform Se VI and Se 2II -selenomethionine taken as organic model to Se IV in water or seawater samples. From our results, an experimental protocol permitting an operational differentiation of selenium species in seawater was proposed.…”