Spatial Distribution and Cause Analysis of Arsenic and Lead Contaminated Site at Guandu, Beitou
Date Issued
2007
Date
2007
Author(s)
Shih, Meng-Tsung
DOI
zh-TW
Abstract
Over 100 hectare paddy soils found heavily polluted by arsenic at Beitou, Taipei, in 2006 was reported from the Ecological Engineering Research Center of NTU through a project sponsored by the Bureau of Environmental Protection, Taipei City Government. The cause has been identified as long-term irrigated with high As content water which mixed with hot spring water from thermal valley brought the metals into the paddy soils. The result also indicate that there are 128 hectares farmland which surface soil and subsurface soil exceeding the soil pollution control standard of arsenic (60 mg kg-1) with the mean concentration around 110 mg kg-1. Although the boundary of the contaminated site has been delineated, the process of transport heavy metals in horizontal and vertical through soil profiles is unclear. The peak concentration was found at about 100 cm depth in some samples. It is quit different from other studies which the maximum concentration shown up within 45 cm depth. This study applies the analytical solution of 1-D convection-dispersion equation (CDE) to simulate the As and Pb transport in soil profiles in order to check whether the irrigation can cause these phenomenon. The result is negative which means high concentration around 100cm is not from irrigation process. Mass balance on As and Pb also indicate the peak concentration of arsenic and lead in soils are not all from irrigation water.
Subjects
砷
鉛
關渡平原
土壤污染
灌溉
Arsenic
Lead
Soil pollution
Guandu Plain
Irrigation
SDGs
Type
thesis
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