Metal contamination, their ecological risk, and relationship with other variables in surface sediments of urban rivers in a big city in Asia: case study of Hanoi, Vietnam

Phung, Thi Xuan Binh; Le, Thi Phuong Quynh; Da Le, Nhu; Hoang, Thi Thu Ha; Nguyen, Thi Mai Huong; Rochelle-Newall, Emma; Nguyen, Thi Anh Huong; Duong, Thi Thuy; Pham, Thi Mai Huong; Nguyen, Tien Dat

doi:10.1007/s11356-024-32549-x

Cited by 1 publication

(1 citation statement)

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“…It serves not only as a repository for pollutants but also as a potential source of contamination. Throughout the process of urbanization, relentless and recurrent human interventions have subjected urban soil to significant disturbances, culminating in pronounced environmental pollution challenges [3][4][5]. The ramifications of this trend are undeniable, surpassing the inherent resilience of soil ecosystems and posing significant socio-ecological challenges.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Heavy Metal Contamination and Ecological Risk in Soil within the Zheng–Bian–Luo Urban Agglomeration

Chen,

Zhang,

Wong

et al. 2024

Processes

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As urbanization accelerates, the contamination of urban soil and the consequent health implications stemming from urban expansion are increasingly salient. In recent years, a plethora of cities and regions nationwide have embarked on rigorous soil geological surveys with a focus on environmental quality, yielding invaluable foundational data. This research aims to develop scientifically robust and rational land-use planning strategies while assessing the levels of heavy metal pollution and associated risks. The urban agglomeration encompassing Zhengzhou, Luoyang, and Kaifeng (referred to as Zheng–Bian–Luo Urban Agglomeration) in Henan Province was designated as the study area. Leveraging the Nemerow comprehensive index method alongside the Hakanson potential ecological risk assessment method, this study delved into the pollution levels and potential ecological ramifications of nine heavy metals, namely Cr, Mn, Ni, Cu, Zn, As, Cd, Pb, and Co. Research indicates that the hierarchy of individual potential ecological risks ranges from most to least significant as follows: Cd > Pb > Cr > Ni > Cu > Zn > As > Mn > Co. The concentrations of Cd in both Zhengzhou and Kaifeng surpassed the established background levels. Furthermore, the mean single-factor pollution index values for the heavy metals Cd and Zn exceeded 1, signifying a state of minor pollution. The Nemerow comprehensive index P of Cd and Zn is between 1 < Pcomp ≤ 2, which is considered mild pollution. The comprehensive P values of the other seven metal elements are all less than 0.7, reaching a clean (alert) level. Predominantly, the primary potential risk factor in the superficial soil of the Zheng–Bian–Luo urban agglomeration is Cd, while the ecological risk implications associated with other heavy metal elements are comparatively minimal. The soil environmental quality within the designated study area remains secure, although certain localized areas pose potential risks of heavy metal pollution. A comprehensive assessment of the current state of soil heavy metal pollution is essential to establish a theoretical foundation and provide technical support for soil environmental protection, pollution mitigation, and sustainable utilization.

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Section: Introductionmentioning

confidence: 99%