首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Spatial distribution of potentially bioavailable metals in surface soils of a contaminated sports ground in Galway, Ireland
Authors:Ligang Dao  Liam Morrison  Ger Kiely  Chaosheng Zhang
Institution:1. GIS Centre, Ryan Institute and School of Geography and Archaeology, National University of Ireland, Galway, Ireland
2. GIS Centre, Sichuan Academy of Grassland Science, Chengdu, Sichuan, China
3. Earth and Ocean Sciences, School of Natural Sciences, Ryan Institute, National University of Ireland, Galway, Ireland
4. Department of Civil and Environmental Engineering, University College Cork, Cork, Ireland
Abstract:Assessing the environmental risk of metal contamination in soils requires the determination of both total (TCs) and bioavailable (BCs) element concentrations. A total of 200 surface (0–10 cm) soil samples were collected from an urban sports ground (South Park) in Galway, Ireland, a former landfill and dumping site, which is currently under remediation. The potential BCs of metals were measured using ethylene-diamine-tetra-acetic acid (EDTA) extraction followed by inductively coupled plasma-optical emission spectrometry analysis, while the TCs were determined using portable X-ray fluorescence spectrometry. It was found that Zn was primarily present in the insoluble residue (EDTA un-extractable) fraction in soils, with the median ratio of BCs/TCs 0.27. However, Pb and Cu had higher ratios of BCs/TCs (median values of 0.60 and 0.39, respectively) suggesting that they are potentially more bioavailable in the soils. The spatial distribution maps showed that both TCs and BCs for Cu, Pb and Zn in the study area were spatially heterogeneous. It was found that the BCs exhibited generally similar spatial patterns as their TCs of Cu, Pb and Zn: high values were mainly located in the west, north-east and south-east portions of the study area, where only a thin layer of topsoil existed. It was recommended that the current remediation action for this site needs to be carried out on an urgent basis.
Keywords:
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号