Abstract
Soil heavy metal pollution threatens ecological health and food security. It is significant to classify pollution risk management and control zones, which can effectively cope with soil pollution and scientifically carry out soil remediation projects. In this study, based on 665 soil samples collecting from Ningbo (southeast China), single pollution index and Nemerow composite pollution index (NCPI) were measured to assess soil pollution risk, and self-organization mapping model was applied to classify management and control zones. Results showed that the heavy metal pollution in the northwest part was more serious, while the east part was less polluted. Although more than 75% soil samples had negligible risks, the Hg and Cu pollution was greatly influential and notable as their polluted samples accounted for 24.21% and 12.48% respectively. Moreover, about 55.34% soil samples and more than half study region had pollution grades, and NCPI values were obviously high with the center of northwest study area. Results also showed that the study region could be classified into four zones with good spatial variabilities. Specifically, Monitored Zone with High-risk Pollution had the highest NCPI caused by human activities, while Controlled Zone with Severe Pollution had relatively high NCPI caused by industrial and agricultural production. Protected Zone with Ecological Conservation and Restricted Zone with Potential Pollution had low NCPIs attributing to historical or natural factors. Our study implies that the classified zones can provide fundamental and momentous information for establishing appropriate priorities of heavy metal risk management and control.
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Acknowledgements
This work is financed by the National Key Research and Development Program of China (2016YFD0201200), the National Natural Science Foundation of China (41771244), the special program of teaching and research development of Liberal Arts in Zhejiang University, and the Core Research Budget of the Non-Profit Governmental Research Institution of China (0032014013). The authors also thank the contributions of the reviewers for this manuscript.
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Xiang, M., Li, Y., Yang, J. et al. Assessment of Heavy Metal Pollution in Soil and Classification of Pollution Risk Management and Control Zones in the Industrial Developed City. Environmental Management 66, 1105–1119 (2020). https://doi.org/10.1007/s00267-020-01370-w
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DOI: https://doi.org/10.1007/s00267-020-01370-w