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Occurrence of Arsenic in Ground Water in the Choushui River Alluvial Fan, Taiwan

^a Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei, Taiwan, 106, ROC
^b Research Center for Environment and Resources Management, National Chen Kung University, Tainan, Taiwan, 701, ROC

View larger version (19K): [in a new window]   Fig. 1. Log-normal distribution of 3-yr averaged As concentration in the ground water of the southern Choushui River alluvial fan in Taiwan. The dotted line represents the current drinking water standard of As concentration (0.05 mg/L) in Taiwan.

View larger version (13K): [in a new window]   Fig. 2. The 3-yr averaged As concentration distribution in the (a) southern Choushui River alluvial fan and (b) the Chianan Plain. The dotted line represents the current drinking water standard of As (0.05 mg/L) in Taiwan.

View larger version (19K): [in a new window]   Fig. 3. Study area. Geological core samples were collected from 13 drilling stations in Yun-Lin county, at 3- or 10-m intervals to a depth of 300 m.

View larger version (22K): [in a new window]   Fig. 4. Analyzed As concentrations of the 655 core samples agree with a log-normal distribution.

View larger version (40K): [in a new window]   Fig. 5. Cross-sectional view of horizontal and vertical As content (mg/kg) distributions. (a) Drilling stations in the west–east direction. (b) Drilling stations in the north–south direction. The dotted and solid lines represent the tops of the aquitards and the aquifers, respectively. The solid triangles represent the locations at which the cores were sampled. The number on the top of each figure specifies the drilling station.

View larger version (18K): [in a new window]   Fig. 6. Box-plot of the logarithm of As concentration in clay, silt, and sand of core samples.

View larger version (15K): [in a new window]   Fig. 7. (a) Correlation between As contents of core samples in aquitards and As concentration in ground water. (b) Correlation between As contents of core samples in aquifers and As concentration in ground water.