Work

XAFS analysis of Arsenic bound in holocellulose extracted from organic-rich contaminated sediments

Year: 2019

Type: conference-paper

Abstract: The arsenic bound in holocellulose, a precursor of humic substances extracted from organic contaminated sediments, was investigated using XANES (x-ray adsorption near-edge structure) and EXAFS (extended x-ray absorption fine structure) with fluorescence mode. The most abundant arsenic bound in holocellulose was As-O in the first coordination sphere. Sulphur and carbon were also found in a neighbouring coordination shell around arsenic. The arsenic oxidation state was judged to be As (III) by As K edge XANES spectra as a shift to higher absorption edge energy with the increasing formal oxidation state. This arsenic speciation and bounding were well matched with biochemical mechanisms of arsenic absorption into plants.

Source: E3S Web of Conferences

DOI: 10.1051/e3sconf/20199809010

Authors: Junko Hara, Susumu Norota

Institutions: Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Hokkaido Research Organization

Language: English

Topic: Arsenic contamination and mitigation

Subfield: Environmental Chemistry

Field: Environmental Science

Domain: Physical Sciences

Open Access status: diamond

Funders: National Institute of Advanced Industrial Science and Technology, Japan Society for the Promotion of Science

Award: Oxidative remediation of persistent organic compounds by FeS2/H2O/O3 reaction system