Toggle Main Menu Toggle Search

Open Access padlockePrints

Mobilization of arsenic from As-containing iron minerals under irrigation: Effects of exogenous substances, redox condition, and intermittent flow

Lookup NU author(s): Professor David WernerORCiD


Full text for this publication is not currently held within this repository. Alternative links are provided below where available.


© 2022 Elsevier B.V.Irrigation activities can cause strong geochemical and hydrological fluctuations in the unsaturated zone, and affect arsenic (As) migration and transformation. The As geochemical cycle in the unsaturated zone is coupled with that of iron minerals through sorption-desorption, coprecipitation and redox processes. Dynamic batch experiments and wetting-drying cycling column experiments were conducted to evaluate As mobilization behaviors under the effects of exogenous substances, redox condition and intermittent flow. Our results show that As release under exogenous substances carried by irrigation (e.g., phosphate, carbonate, fulvic acid, humic acid, etc.) followed three trends with the types of exogenous inputs. Inorganic anions and organic matter resulted in opposite trends of arsenate release in different redox conditions. In anoxic environments, As(V) release was favored by the addition of phosphate and carbonate, while in oxic environments, the mobilization of As(V) was promoted by the addition of fulvic acid (FA). Further, intermittent irrigation promoted the reductive dissolution of Fe oxides and the mobilization of As. The addition of humic acid (HA) resulted in the mobilization of arsenate as As-Fe-HA ternary complexes. The mechanism of arsenic mobilization under irrigation has importance for prevention of arsenic exposure through soil to food chain transfer in typical high arsenic farmland.

Publication metadata

Author(s): Cai D, Kong S, Shao Y, Liu J, Liu R, Wei X, Bai B, Werner D, Gao X, Li C

Publication type: Article

Publication status: Published

Journal: Journal of Hazardous Materials

Year: 2022

Volume: 440

Print publication date: 15/10/2022

Online publication date: 08/08/2022

Acceptance date: 07/08/2022

ISSN (print): 0304-3894

ISSN (electronic): 1873-3336

Publisher: Elsevier B.V.


DOI: 10.1016/j.jhazmat.2022.129736


Altmetrics provided by Altmetric