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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51978

Title: Mapping Soil Lead and Remediation Needs in Contaminated Soils
Authors: Lin, Chi-Wen
Contributors: 國立臺灣海洋大學:地球科學研究所
Keywords: contaminated soils
Kriging
lead
remediation
spatial distribution
Date: 2002-03
Issue Date: 2019-01-10T03:13:14Z
Publisher: Environmental Geochemistry and Health
Abstract: Abstract: For the past two decades, the Taiwan Environmental Protection Administration has made a systematic investigation of As, Cd, Cr, Cu, Pb, Hg, Ni and Zn in agricultural soils to identify soil pollution from industrial production. The EPA has cooperated with local governmental agencies to establish a soil quality monitoring system that would upgrade the land recovery ability and prohibit polluted lands from being cultivated or turned over to other uses. Based on an island-wide soil survey, more than 1,000 hectares of arable soils in Taiwan were found to be considerably contaminated by heavy metals. One of the heavy metal contaminated sites, located near a ceramic product manufacturing factory in Nantou County, was identified as lead contaminated. According to the Nantou Environmental Protection Bureau, the lead content in contaminated sites showed a great variation of several ‘mg Pb kg−1 soil’ to several thousands ‘mg Pb kg−1 soil’. Therefore, it is appropriate to estimate the lead spatial distribution through geostatistics such as Kriging. The soil lead concentration contour maps obtained by Kriging can help us to identify the pollution patterns and delineate the range of contaminated sites. The purpose of this study is to determine the Pb concentrations at each location by performing detailed soil sampling on those Pb contaminated sites and estimating the lead spatial distributions by Kriging. A total of 70 soils were sampled from different locations at two experiment sites. Lead contents were determined with 0.1 M HCl extractable lead content of the soils. The results obtained by investigating the lead contents in each 15 cm segment down to a 60 cm depth, revealed that lead contents were greater in arable land near the ceramic products manufacturing factory, and lead concentrations decreased with depth. In addition, Pb concentrations in heavily contaminated soils showed heavy concentrations of Pb in specific locations. Results from Pb content spatial distributions indicated that the Kriging model is a useful tool and can provide decision-makers with critical information for delineating hazardous areas in heavy metal contaminated sites.
Relation: 24(1) pp.23-33
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51978
Appears in Collections:[應用地球科學研究所] 期刊論文

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