Inorganic selenium speciation in groundwaters by solid phase extraction on Dowex 1X2

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 ).…”

Sorption behavior of nano-TiO2 for the removal of selenium ions from aqueous solution

“…Above pH 9.0 selenite species dominates and as pH decreases below pH 3.5 [12], selenious acid dominates. The pK a of selenic acid is 1.92, selenate (SeO 4 2− ) is the dominant species when pH > 1.9 [13]. Therefore, biselenite (HSeO 3 − ) and selenate (SeO 4 2− ) was the dominant species when pH ranges from 2 to 6, selenite (SeO 3 2− ) and selenate (SeO 4 2− ) are predominant ions in the alkaline medium.…”

Preparation of titanate nanoflower for sorption of 75Se(IV) radioisotope from aqueous solution: Equilibrium, kinetic and thermodynamic studies

“…Between pH 3.5 and 8.0, biselenite is the predominant ion in water. Above pH 8.0 selenite species dominates and as pH decreases below pH 3.5 [32], selenious acid dominates [33]. Therefore, biselenite (HSeO − 3 ) was the dominant species when pH ranges from 3.5 to 8.…”