|Title:||Arsenic and lead (beudantite) contamination of agricultural rice soils in the Guandu Plain of northern Taiwan||Authors:||Chiang, K.Y.
Chiang, Kai Ying
Lin, Kuo Chuan
Lin, Sheng Chi
Wang, Ming Kuang
|Keywords:||Agricultural paddy soils; Beudantite; Hot springs; Sequential extraction||Issue Date:||2010||Journal Volume:||181||Journal Issue:||1-3||Start page/Pages:||1066-1071||Source:||Journal of Hazardous Materials||Abstract:||
This study investigates the species of As and Pb (beudantite) residues present in the seriously contaminated agricultural rice soils of the Guandu Plain. Two pedons in the Guandu Plain agricultural soils, each pedon separated into five horizons (each of 20. cm) were collected for this study. Soil samples were packed into a column for leaching with simulated acid rains. Soil pH ranged from 5.1 to 7.1 with high base saturation. Soils can be classified as clay loam, mixed, thermic, Typic or Umbric Albaqualfs. The XRD analysis indicated the beudantite particles are present in clay fractions, showing high concentrations of As and Pb. This is because of 50-100 years ago irrigation water was introduced from Huang Gang Creek of hot springs containing high concentrations of As and Pb. Only low concentrations of As and Pb can be leached out with simulated acid rains (i.e., pHs 2 and 4), even through 40 pore volumes of leaching experiments. The sequential extraction experiments resulted in the high portions of As and Pb remaining in the amorphous, Fe and Al oxyhydroxides and residual fractions. Thus, the remediation of As and Pb in this agricultural rice paddy soils merits further study. © 2010 Elsevier B.V.
|DOI:||10.1016/j.jhazmat.2010.05.123||SDG/Keyword:||Agricultural paddy soils; Agricultural soils; Clay fractions; Clay loams; High concentration; Irrigation waters; Leaching experiments; Low concentrations; Northern Taiwan; Oxyhydroxides; Paddy soils; Pore volume; Residual fraction; Rice paddy; Rice soil; Sequential extraction; Soil pH; Soil sample; XRD analysis; Acid rain; Acids; Arsenic; Experiments; Hot springs; Irrigation; Leaching; Metal recovery; Pollution; Positive ions; Soils; Water supply; Lead; aluminum; arsenic; hydroxide; iron; lead; arsenic; lead; soil pollutant; water pollutant; acid rain; agricultural soil; arsenic; extraction method; irrigation system; lead; paddy field; pedon; pH; soil pollution; soil remediation; thermal spring; X-ray diffraction; acid rain; agricultural management; article; bioremediation; clay; concentration (parameters); extraction; irrigation (agriculture); leaching; loam soil; pH; rice; soil analysis; soil pollution; soil property; Taiwan; thermal spring; X ray diffraction; analysis; crop; ecosystem restoration; soil pollutant; water pollutant; Arsenic; Crops, Agricultural; Environmental Remediation; Lead; Oryza sativa; Soil Pollutants; Taiwan; Water Pollutants, Chemical; Taiwan; Arsenic; Crops, Agricultural; Environmental Restoration and Remediation; Lead; Oryza sativa; Soil Pollutants; Taiwan; Water Pollutants, Chemical
|Appears in Collections:||生物環境系統工程學系|
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