Comparing the Classification of Copper Concentrations in Taiwan Farmland Soils by Baseline Method and Finite Mixture Distribution Model
Resource
農業工程學報 52 (2): 23-29
Journal
農業工程學報
Journal Issue
2
Pages
23-29
Date Issued
2006
Date
2006
Author(s)
楊松岳
Abstract
The baseline method (BM) is typically adopted to determine the background concentration of heavy metals in soils. The long-range transport of contaminants makes the sampling of undisturbed or unaffected soil difficult, thus making it difficult to determine the background concentration, especially in urban and industrial areas. This study adopted the finite mixture distribution model (FMDM) not only to classify Cu concentrations based on 918 representative Taiwan farmland soil samples, but also to compare the results with those obtained using a traditional BM. The parameters and classes of FMDM were obtained; the proportion of each soil in each class, and the hit rate of each class were calculated. The results showed that FMDM was more effective than BM in describing Cu distribution in soils, and the goodness of fit of FMDM could be evaluated, but that of BM could not. In addition, FMDM effectively overcame the difficulty of defining the background site. In particular, from the perspective of environmental risk assessment, BM underestimates the proportion of contaminated soil included during sampling; however, FMDM can effectively separate most of the contaminant soils from soil samples.
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Type
journal article
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