Fate of As(V)-treated nano zero-valent iron: Determination of arsenic desorption potential under varying environmental conditions by phosphate extraction

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Courtesy of IWA Publishing

Nano zero-valent iron (NZVI) offers a promising approach for arsenic remediation in the subsurface environment, but the spent NZVI with elevated arsenic content left unattended at treated sites in subsurface could arouse safety concerns regarding the potential remobilization of arsenic under varying geochemical conditions. This paper presents a systematic study aimed at investigating the fate of As(V)-treated NZVI (As-NZVI), by examining the desorption potential of As in varying conditions.

Currently, the environmental fate and health risks of nanomaterials are hot topics in nanotechnology research, however only a few studies to date have been published regarding the long-term reactivity and fate of NZVI, especially the spent NZVI. Taken the As-NZVI as an example, this paper presents a novel investigation of the environmental fate of NZVI with immobilized arsenic under conditions relevant to in-situ remediation.

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