Biogeochemical reductive release of soil embedded arsenate around a crater area (Guandu) in northern Taiwan using X-ray absorption near-edge spectroscopy
Kai-Ying Chiang , Tsan-Yao Chen
,
Chih-Hao Lee
,
Tsang-Lang Lin
,
Ming-Kuang Wang
,
Ling-Yun Jang
,
Jyh-Fu Lee
DOI:10.1016/S1001-0742(12)60084-9
Received June 04, 2012,Revised July 16, 2012, Accepted , Available online March 08, 2013
Volume ,2013,Pages 626-636
This study investigates biogeochemical reductive release of arsenate from beudantite into solution in a crater area in northern Taiwan, using a combination of X-ray absorption near-edge structure (XANES) and atomic absorption spectrometry. Total arsenic (As) concentrations in the soil were more than 200 mg/kg. Over four months of laboratory experiments, less than 0.8% As was released into solution after reduction experiments. The 71% to 83% As was chemically reduced into arsenite (As(III)) and partially weathering into the soluble phase. The kinetic dissolution and re-precipitation of As, Fe, Pb and sulfate in this area of paddy soils merits further study.
