Spatial distribution and background values of arsenic and cobalt in soils on the south side of Laoshan in Nanjing： based on parent rock influence and geostatistical analysis

ZHANG Jing; WANG Lei; YAN Yu; HUANG Yanqiu; SUN Rui

doi:10.13205/j.hjgc.202508019

Volume 43 Issue 8

Aug. 2025

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ZHANG Jing, WANG Lei, YAN Yu, HUANG Yanqiu, SUN Rui. Spatial distribution and background values of arsenic and cobalt in soils on the south side of Laoshan in Nanjing： based on parent rock influence and geostatistical analysis[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(8): 204-213. doi: 10.13205/j.hjgc.202508019

Citation:

ZHANG Jing, WANG Lei, YAN Yu, HUANG Yanqiu, SUN Rui. Spatial distribution and background values of arsenic and cobalt in soils on the south side of Laoshan in Nanjing： based on parent rock influence and geostatistical analysis[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(8): 204-213. doi: 10.13205/j.hjgc.202508019

Citation:

ZHANG Jing, WANG Lei, YAN Yu, HUANG Yanqiu, SUN Rui. Spatial distribution and background values of arsenic and cobalt in soils on the south side of Laoshan in Nanjing： based on parent rock influence and geostatistical analysis[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(8): 204-213. doi: 10.13205/j.hjgc.202508019

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Spatial distribution and background values of arsenic and cobalt in soils on the south side of Laoshan in Nanjing： based on parent rock influence and geostatistical analysis

doi: 10.13205/j.hjgc.202508019

ZHANG Jing¹,
WANG Lei^{1,2
,
,},
YAN Yu¹,
HUANG Yanqiu³,
SUN Rui¹

1. Shanghai Municipal Engineering Design Institute(Group) Co., Ltd., Shanghai 200092, China;
2. Tongji University, Shanghai 200092, China;
3. Nanjing Institute of Environmental Science, Ministry of Ecology and Environment of the People's Republic of China, Nanjing 210042, China

Received Date: 2025-02-13
Accepted Date: 2025-06-06
Rev Recd Date: 2025-04-21

Abstract

Abstract

On the south side of Laoshan in Nanjing， the detected content of arsenic and cobalt in soils at different depths is abnormally high， with 12.15% and 12.97% of all sampling sites exceeding the screening value for Class I construction land， respectively. The exceedance points are distributed throughout the entire field， and the samples that exceed the standard are concentrated in the sedimentary and transported parent rock layers. Overall， the arsenic and cobalt content in the subsoil is higher than that in the topsoil. However， there are no traces of artificial pollution in the history of the plot. Based on the spatial distribution characteristics of arsenic and cobalt and the geological conditions of the plot， the high arsenic and cobalt content in the soil is identified related to the parent rock. The current soil environmental management system has some limitations in evaluating the high background of heavy metals at the plot scale. By employing statistical methods， the 95th percentile value was selected as the soil background value， thus it can provide a reference for the formulation of soil remediation targets in this study area. The method for identifying high-background soils and determining background values developed in this study facilitates more targeted investigation and remediation of sites with abnormally high heavy metal levels， thereby largely avoiding over-investigation and over-remediation.
- soil,
- heavy metal,
- pollution characteristics,
- background values

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References(40)

References

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