Health and Ecological Risk Assessment for Arsenic Contaminated Site in Guandu
Date Issued
2008
Date
2008
Author(s)
He, Yi-Rong
Abstract
The heavy metals in the soils and the groundwater were investigated in Taipei in 2007, and found that the concentration of Arsenic is extraordinarily high in Guandu. The agricultural land is main polluted source, so the pollutant could enter the food-chain through the absorbance by the plants. Besides, the local ecosystem is the most direct receptor that exposed to the pollutant. Therefore, the study is based on the results of “Monitoring and investigation of heavy metals in soil of Taipei City”, and carries out health and ecological risk assessment in Guandu.he medium includes soil, air, groundwater and food chain on health risk assessment in this study, and the potential harmful effects of receptors were assessed by direct and indirect exposure routes. The result of health risk assessment shows that the carcinogenic and non-carcinogenic risks of residents and tourists on site 1 are less than the standard (<10-6). The carcinogenic and non-carcinogenic risks of farmers and self-contained farmers exceed the standard (>10-6). The indicators contain rice, earthworms and sparrows on ecological risk assessment in this study, and the potential harmful effects of receptors were assessed by direct and indirect exposure routes. The results show that the risk of rice in three sites is lower than toxic level. The RQs of earthworms and sparrows in site 1 are close to 1, and that in site 2 and 3 are less than 1.ealth and ecological risk assessment were integrated in this study. Through the assessment, important factors are confirmed and resulting risks quantified and thus the management and policy determination for remediation of the contaminated site can be suggested.
Subjects
Health risk assessment
Ecological risk assessment
Guandu
soil and groundwater
risk quotient (RQ)
Type
thesis
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