Heavy metal pollution and ecological risk assessment in brownfield soil from Xi’an, China: An integrated analysis of man-land interrelations

Abstract

The core of urbanization is land use change, resulting in the urban sprawl and urban population explosion. The problem of land resources shortage and ecological environment destruction has become increasingly prominent. Land use change and human activities can directly lead to urban soil pollution. This study analyzed the concentration of Cd, Cr, Cu, Ni, Pb, Zn, Hg and As in the original site of Xi’an chlor-alkali chemical plant, which was know as a brownfield. The results showed the concentrations of Hg, Pb and Zn in research areas were obviously higher than soil background value. Through pollution index (PI) method and Geo-accumulation Index (I geo ) method, totally 26 sample points in different areas (A, B, C, D) were classified into different pollution degrees. The CPI results indicated 9 sample points were heavily polluted, accounting for 34.6% of the total. Among them, 6 out of 9 were located in area A. 12 samples points were not polluted. The average I geo values of single heavy metal were arranged in the order of Hg (1.83) > Zn (1.26) > Pb (0.33). The pollution of Hg was relatively serious and extensive, especially in area A. It was mainly because of the historical pollution produced by chemical plant. The pollution of Pb in each point was quite different. Mainly influenced by automobile related activities, I geo (Pb) in sample point 15 and 16 were all beyond 4.00. The average potential ecological risk (PER) of each area was in the order of A (1428) > B (297) > D (249) > C (163). The ecological risk was mainly determined by previous industrial production and present human activity at the same time. People and land are interdependent and interactive. The understanding on the mechanism of man-land interralations, regarding to urban land use and ecological environment, will promote urban sustainability.

The role of distinct electricity sources on pollution abatement: Evidence from a wide global panel

“…A worrying finding is that pollution is a persistent phenomenon, as indicated by the statistical significance of the lagged values of GHG emissions, which is in line with the results of Liu, et al (2020) and Solarin, et al (2021) for various polluting substances Moreover, this implies that GHG emissions might continue to rise, as Tudor & Sova (2021) have predicted for a panel of twelve heaviest polluters globally, with a strong upward GHG trend in developing countries (Brazil, Indonesia and India) that seems to fully compensate the declines in emissions projected for the developed countries in the panel. This has dramatic consequences on population health, as well as on health systems and their costs (Hänninen, et al, 2011;Ragothaman & Anderson, 2017).…”

Public Private Partnership to Brownfield Remediation Projects in China: A Combined Risk Evaluation Approach

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