行政院國家科學委員會補助專題研究計畫成果報告:濁水溪沖積扇南翼地層環境中砷之富集、釋出、分布及地化傳輸(1/3)
Date Issued
2005
Date
2005
Author(s)
DOI
932313B002071
Abstract
High arsenic, As, concentrations in deep well water have been verified to be associated with
blackfoot disease, which was once common on the Chianan plain in Taiwan. This is the
first-year report of a three-year project. An investigation of shallow groundwater quality
revealed that high arsenic, As, concentrations were found in both aquifers and aquitards in the
southern Choshui river alluvial fan of Taiwan. 655 geological core samples from 13 drilling wells
were collected and analyzed. High As contents were found primarily in aquitards, to a maximum
of 590 mg/kg. The contents were correlated with the locations of the marine sequences.
Additionally, strong correlations among the As concentrations of core samples, the clay and the
geological age of the Holocene transgression were identified. Most of the As in groundwater
originated from the aquitard of the marine sequence. The high As content in marine formations
with high clay contents may be attributable to the bioaccumulation of As in the sea organisms,
which accumulated and were deposited in the formation. A preliminary environmental model of
the origin of the high As concentration in the shallow sedimentary basin of the Choshui river
alluvial fan of Taiwan is proposed. The enrichment and release mechanism will be investigated
in the second and third years study to establish a model of the ecological cycle of As in Choshui
river alluvial fan in Taiwan.
Subjects
arsenic
occurrence
marine sequence
sedimentary basin
SDGs
Publisher
臺北市：國立臺灣大學生物環境系統工程學系暨研究所
Type
report
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