Partitioning of arsenic in soil-crop systems irrigated using groundwater: a case study of rice paddy soils in southwestern Taiwan

in Sciences Citation Index(SCI), 科學引文索引資料庫(SCI)
標題Partitioning of arsenic in soil-crop systems irrigated using groundwater: a case study of rice paddy soils in southwestern Taiwan
出版類型SCI(Sciences Citation Index)
出版年度2012
AuthorsW.M. Hsu, 許文明, H.C. Hsi 席行正, Y.T. Huang 黃宥端, C.S. Liao 廖健森, & Hseu 許正一
開始頁606
頁數7
出版日期2012 / 2
其他編號I9911216
中文摘要

The accumulation of As in rice due to groundwater irrigation in paddy fields represents a serious health hazard in South and Southeast Asia. In Taiwan, the fate of As in long-term irrigated paddy fields is poorly understood. Groundwater, surface soil, and rice samples were collected from a paddy field that was irrigated with As-containing groundwater in southwestern Taiwan. The purpose of this study is to elucidate the source and sink of As in the paddy field by comparing the As fractions in the soils that were obtained by a sequential extraction procedure (SEP) with the As uptake of rice. The risks associated with eating rice from the field can thus be better understood. The concentration of As in groundwater varied with time throughout the growing seasons of rice, but always exceeded the permitted maximum (10 μg L-1) for drinking water by the WHO. The As concentration increased with the concentration of Fe in the groundwater, supporting the claim that a large amount of As was concentrated in the Fe flocs collected from the internal wall of the groundwater pump. The results of the SEP revealed that As bound with amorphous and crystalline hydrous oxides exhibited high availability in the soils. The root of rice accumulated the largest amount of As, followed by the straw, husk, and grain. Although the As concentration in the rice grain was less than 1.0 mg kg-1, the estimated intake level was close to the maximum tolerable daily intake of As, as specified by the WHO.

網址http://www.elsevier.com
期刊名稱Chemosphere
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