Influence of pH and sulfate concentration on hydrous ferric arsenate transformation behavior and As(v) mobilization.

ABSTRACT: This study investigates the effect of various SO₄ ^2- concentrations (0, 50, and 100 mM) on the phase transformation of hydrous ferric arsenate (HFA) and partitioning behaviors of As(v), Fe(iii), and SO₄ ^2- under ambient (25 °C, 15 d) and subsequent elevated temperature (80 °C, 35 d) conditions. The results revealed that the primary factor controlling the transformation of HFA into crystalline scorodite was the pH, whereas the SO₄ ^2- concentration played a secondary, pH-dependent role. More specifically, at pH 4 and under ambient temperature, SO₄ ^2- enhanced the release of As(v) and Fe(iii) into the solution. By contrast, at pH 6 and 8, SO₄ ^2- promoted the formation of basic ferric

SUBMITTER: Wang X 

PROVIDER: S-EPMC12513469 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature