Speciation Characteristics and Ecological Risk Assessment of Heavy Metal Elements in Soils of Typical Industrial City

BAI Yuming; LI Yongli; ZHOU Wenhui; HU Haoyuan; LU Zhen; BIAN Peng

doi:10.15898/j.cnki.11-2131/td.202109030113

Rock and Mineral Analysis > 2022 > 41(4): 632-641. > DOI: 10.15898/j.cnki.11-2131/td.202109030113

BAI Yuming, LI Yongli, ZHOU Wenhui, HU Haoyuan, LU Zhen, BIAN Peng. Speciation Characteristics and Ecological Risk Assessment of Heavy Metal Elements in Soils of Typical Industrial City[J]. Rock and Mineral Analysis, 2022, 41(4): 632-641. DOI: 10.15898/j.cnki.11-2131/td.202109030113

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Speciation Characteristics and Ecological Risk Assessment of Heavy Metal Elements in Soils of Typical Industrial City

Hohhot Center of Natural Resources Comprehensive Survey, China Geological Survey, Huhhot 010010, China

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Received Date: September 02, 2021
Revised Date: December 01, 2021
Accepted Date: January 27, 2022
Available Online: September 08, 2022

Abstract

HIGHLIGHTS
(1) The contents and speciation characteristics of heavy metals in soils of an urban area of the Hetao Plain were investigated, and the ecological risk of heavy metals was evaluated.

(2) The contents of heavy metals (except As) exceeded the background value of the Hetao Plain. The speciation of heavy metals was mainly in residual fraction. The ion exchange fraction and carbonates bond fraction of Cd and Mn, Zn, Pb in industrial zones were relatively high.

(3) The risk assessment code indicated that Cd and Pb in the industrial area reached the high-risk level.

ABSTRACT

BACKGROUND
The development of urban industrialization causes soil heavy metal pollution and other environmental problems. Studies have shown that the damage caused by soil heavy metals to the ecological environment is not only related to the total content, but also depends on the speciation of heavy metals.
OBJECTIVES
To investigate the content characteristics, speciation and risk status of heavy metals in soil of a city in the Hetao Plain.
METHODS
52 soil samples were collected from different functional areas of the Hetao Plain, heavy metals were analyzed by inductively coupled plasma-mass spectrometry (ICP-MS), atomic fluorescence spectrometry (AFS) and other analytical methods to study the total content and speciation. The ecological risk of soil heavy metals was evaluated using the RAC risk assessment method.
RESULTS
The results showed that the contents of heavy metal elements (except As) in surface soil were higher than the background values in the Hetao Plain, the variation coefficients of Pb, Cr, Mn, Cd and Zn were large and the spatial distribution was not uniform, which were significantly affected by human activities. The heavy metal content in the industrial area exceeded the background value, especially Cd (5.83 times of background value) and Pb (3.58 times of background value). Road heavy metal contents were also significantly higher than the background value, Cd was nearly 4 times the background value. Except for Cd in industrial areas, other heavy metals were mainly in residual fraction. The residual fractions of Cr, Ni, Cu and As were more than 70%. The residual fraction of Cd in each functional region accounted for about 30%. RAC risk assessment results showed that Cd and Pb in industrial areas reached the high-risk level.
CONCLUSIONS
The research results provide scientific basis for identifying the potential environmental risks in urban area soil and proposing effective prevention.

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References (38)

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