한빛사 논문
Hyun Ho Lee a, Yong Dong Noh b, Do yeong Hur c, Sungkyun Park d, Sehwan Song d, Jong-Seong Bae e, Hojeong Kang a, Sung Un Kim b,f, Chang Oh Hong b,f
aSchool of Civil and Environmental Engineering, Yonsei University, Seoul 03722, South Korea
bDepartment of Life Science and Environmental Biochemistry, Pusan National University, Miryang 50463, South Korea
cDepartment of Crop and Soil Sciences, North Carolina State University, NC 27695, United States
dDepartment of Physics, Pusan National University, Busan 46241, South Korea
eBusan Center, Korea Basic Science Institute, Busan 46742, South Korea
fLife and Industry Convergence Research Institute, Pusan National University, Miryang 50463, South Korea
Corresponding author: Chang Oh Hong
Abstract
This study aimed to evaluate the reducing effects of calcite and phosphogypsum on arsenate [As(V)] availability to plants and elucidate the mechanisms of As(V) immobilization. The concentration of available As(V) to plants in upland arable soils with 1% calcite and phosphogypsum decreased to 17.4% and 36.9%, respectively, compared to the control. As(V) phytoavailability depends on the soil pH and calcium materials. The process of stabilizing As(V) (F3; anion exchange) with phosphogypsum is faster and easier compared to that with calcite (F4; bind to carbonate), but it results in a less stable form. New Ca-As(V) minerals (Ca52(HAsO4)x(AsO4)∙yH2O, Ca5H2x(AsO4)∙yH2O, or Ca32(AsO4)∙10 H2O) were identified in X-ray diffraction (XRD) patterns with calcite treatment. Precipitation, the primary mechanism induced by calcite, was activated at a soil pH above 8.0. Based on the deconvolution of calcium and sulfur X-ray photoelectron spectroscopy spectra and the peak shift in the XRD pattern in phosphogypsum, the substitution in which SO42- is exchanged with HAsO42- is the primary mechanism for As(V) immobilization. Substitution induced by phosphogypsum is a suitable reaction in upland arable soils, the predominant form of As(V) in the soil, with a pH range of 5-7.
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