

FOLLOWUS
1.Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education; School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
2.Donghai Laboratory, Zhoushan 316000, China
3.Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
4.School of Marine Sciences, Hainan University, Haikou 570228, China
tfxiao@gzhu.edu.cn
syhu@hainanu.edu.cn
Received:12 November 2025,
Online First:17 September 2026,
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WANG Qiugui,XIAO Enzong,FANG Penggao,et al.Spatial distribution, sources, and ecological risk of potentially toxic elements in granite-derived surface soils and river sediments of an agricultural watershed, Eastern China[J].Journal of Oceanology and Limnology,
WANG Qiugui,XIAO Enzong,FANG Penggao,et al.Spatial distribution, sources, and ecological risk of potentially toxic elements in granite-derived surface soils and river sediments of an agricultural watershed, Eastern China[J].Journal of Oceanology and Limnology, DOI:.
Potentially toxic elements (PTEs) in agricultural soils and river sediments pose major ecological risks. However
their distribution
sources
and geochemical behavior in subtropical granite derived watersheds remain insufficiently constrained. In this study
15 surface soil and 12 river sediment samples were collected from a granitic watershed in Zhejiang Province
China
to investigate the spatial distribution
provenance
and ecological risks of seven PTEs (arsenic (As)
cadmium (Cd)
chromium (Cr)
copper (Cu)
nickel (Ni)
lead (Pb)
and zinc (Zn)). The resulted show that PTE concentrations vary widely
in the range of 1.4–38.4 mg/kg for As
0.05–1.32 mg/kg for Cd
4.0–94.0 mg/kg for Cr
2.5–37.0 mg/kg for Cu
2.0–27.5 mg/kg for Ni
21.5–108 mg/kg for Pb
and 56–202 mg/kg for Zn. Cr
Cu
and Ni exhibit decreasing concentrations from upstream to downstream
reflecting dominant lithogenic control by granite weathering
whereas Cd
Pb
and Zn show enrichment in midstream and downstream areas due to anthropogenic inputs. On average
river sediment Cd concentrations are 2.5 times higher than those in soils. Risk assessment indicates that several PTEs exceed regional background values
but Cd exhibits the strongest enrichment
with enrichment factor (EF) values up to 12.1. Ecological risk assessment based on an adjusted potential ecological risk index (RI) indicates that the watershed is generally characterized by low to moderate ecological risk. However
Cd contributes disproportionately to total ecological risk
accounting for 42.2%–82.5% (mean 73.8%) of the RI values
and midstream sediments represent clear risk hotspots. Multivariate statistical analyses distinguish lithogenic PTEs (Cr
Cu
Ni
Ti) with low mobility and residual enrichment from anthropogenic PTEs (Cd
Pb
Zn) exhibiting strong particle-associated transport and cumulative downstream accumulation. These results demonstrate that soil-sediment transfer amplifies Cd-dominated ecological risks in granite-derived agricultural watersheds and highlight the need for targeted agricultural management strategies.
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