Ecological Risk Evaluation and Source Identification of Heavy Metal Pollution in Urban Village Soil Based on XRF Technique

Abstract

The rapid urbanization in China has resulted in significant differences between urban and rural areas. The emergence of urban villages is inevitable in this context, for which complex problems regarding land use, industrial management and ecological environment have arisen. This study performed a case study on a typical urban village, by assessing heavy metal pollution and ecological risk in soil. It detected a total of 80 basic units through portable X-ray fluorescence (XRF) instrument. A total of 25 high-risk contaminated points were selected, sampled and analyzed in laboratory as confirmation. The results showed the mean concentrations of Pb, Cu, Zn and Ni in soil were significantly higher than background values. Pb, Zn and Ni showed obvious pairwise correlation, and the high-value zones could be attributed to automobile traffic and industrial activities. In addition, the pollution problem is complicated by a combination of agricultural activities, the absence of clear division between different functional zones, as well as a general lack of environmental awareness. All of these lead to increased ecological risk and are a serios threaten to public health.

A new technique for baseline calibration of soil X-ray fluorescence spectra based on enhanced generative adversarial networks combined with transfer learning

“…Aer denormalization, the denormalization result y is indexed. See eqn (8) for the calculation formula.…”

“…Therefore, the analysis accuracy of the ED-XRF spectrum needs to be improved. [8][9][10][11] Hence, it becomes very necessary to deduct the background of the spectrum during the XRF pre-processing process.…”

Community Bargaining with Urban Growth: The Case of J Village in Guangzhou

“…The success of the growth machine theory does not prescribe the politics that guide development, especially when the costs and benefits of development are hidden from the public. Government officials "sell" many development projects to the communities "on a go/no go basis" with the hope that development will benefit the entire community (such benefits are often distorted by the landowning elites); and, in many cases, development is also accompanied by many negatives, such as higher housing prices, increased pollution [17], and higher taxes [18]. In later urbanization research, the interests of residents and communities have received increasing attention.…”

Quantitative Analysis of Soil Cd Content Based on the Fusion of Vis-NIR and XRF Spectral Data in the Impacted Area of a Metallurgical Slag Site in Gejiu, Yunnan

“…Portable X-ray fluorescence (pXRF) has been widely applied in heavy metal detection because of its advantages of speed, non-destructiveness, low cost, simultaneous multi-element analysis, and on-site detection [14]. However, the test results of this instrument are highly uncertain due to the influence of soil physicochemical properties, detection limits of elements, and detection principles, making it difficult to predict heavy metal pollution at large spatial scales [15]. Compared to the individual use of vis-NIR or X-ray fluorescence (XRF), the fusion of XRF and NIR spectra can expand the coverage of soil properties [16].…”