Abstract
AbstractIn this study topsoil samples were collected from 57 sites of Dongxihu District which is a typical Chinese urban–rural combination area, to analyze the causes and effects of 6 heavy elements. (Ni, Pb, As, Cu, Cd, and Hg) Pollution of Enrichment factor, multivariate statistics, geostatistics were adopted to study the spatial pollution pattern and to identify the priority pollutants and regions of concern and sources of studied metals. Most importantly, the study area was creatively divided into central urban, semi-urbanized, and rural areas in accordance with the characteristics of urban development and land use. The results show that the pollution degree of potential ecological risk assessment is Hg>Ni>Cu>As>Cd>Pb, and semi-urban regions> city center> rural areas. Results based on the proposed integrated source identification method indicated that As was probably sourced from agricultural sources (33.99%), Pb was associated with atmospheric deposition (50.11%), Cu was related to industrial source 1 (45.97%), Cd was mainly derived from industrial source 2 (42.97%) and Hg come mainly from industrial source 3 (56.22%). The pollution in semi-urban areas in urbanization need more attention.
Highlights
Industrial and economic activities are increasingly concentrated in city areas in china and it have become a new focus of resource consumption and chemical emissions [1,2]
This work aims to (1) divide the land into central urban, semi-urbanized, and rural areas according to the characteristics of land using; (2) analysis of pollution degree in different urbanization areas in the process of urbanization by Potential ecological risk assessment; (3) analysis the geographical distribution characteristics of pollutants by GIS; (4) identify the pollution sources and contribution of major pollution elements based on Positive matrix factorization (PMF), identify the exploration of source spatial distribution by PMF and GIS
The soil pH of the Dongxihu District is high in the southeast and low in the northwest
Summary
Industrial and economic activities are increasingly concentrated in city areas in china and it have become a new focus of resource consumption and chemical emissions [1,2]. The pollution distribution in soil changes in these areas because of the complex source apportionment with the huge scale of construction and the mass human activities [4,5]. Soil pollution evaluation in China uses various evaluation methods, such as the single factor index, Nemero index, and environmental capacity methods, based on soil quality standards to identify the land and evaluate its developmental ability [8,9]. In China, soil environmental quality risk control standards for soil contamination is update to GB15618-2018 (agricultural land) and GB36600-2018 (construction land). The assessment of the impact of different pollutants on human health or ecological risk become more important instead of the quality control indexes identified [10]. From the perspective of environmental toxicology and ecological effects, the potential ecological risk index method can assess the situation of various heavy metals with different harmful substances and make a comprehensive
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