Heavy metals in coastal wetland sediments of the Pearl River Estuary, China

Li, Qu-Sheng; Wu, Zhifeng; Chu, Bei; Zhang, Na; Sha-sha, Cai; Jian-hong, Fang

doi:10.1016/j.envpol.2007.01.006

Cited by 229 publications

(79 citation statements)

References 29 publications

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“…Based on the threshold values given in the RAC (Perin et al, 1985), Cr and As in the surface sediments posed almost no risks, Pb, Ni, Zn and Cu posed low risks, while Cd posed a very high risk. These observations are consistent with previous reports on heavy metal speciation in marine and estuarine sediments (Morillo et al, 2002;Man et al, 2004;Li et al, 2007). It should be noted that pollutants with very high bioavailability at very low total concentrations do not entail a serious concern, while those with low bioavailable fractions but at very high total concentrations may exert considerable environmental risks (Liu et al, 2009).…”

Section: Heavy Metals In Surface Sedimentssupporting

confidence: 82%

Heavy metal pollution in sediments of a typical mariculture zone in South China

Zhang

Liu

Cheng

et al. 2012

Marine Pollution Bulletin

163

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Section: Heavy Metals In Surface Sedimentssupporting

confidence: 82%

Heavy metal pollution in sediments of a typical mariculture zone in South China

Zhang

Liu

Cheng

et al. 2012

Marine Pollution Bulletin

163

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“…Pardo et al, 1993;Li et al, 2007). This is because Cu shows high affinity with humic substances, which are a fraction of natural organic matter chemically active in complexing such metals (Pempkowiak et al, 1999).…”

Section: Co Cu and Znmentioning

confidence: 99%

Environmental status of Daya Bay surface sediments inferred from a sequential extraction technique

Gao

Chen

Wang

et al. 2010

Estuarine, Coastal and Shelf Science

144

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“…Heavy metal pollutants have been considered to be one of the most critical global pollutants and pose a serious threat to human health and natural ecosystems (Lotze et al 2006;Li et al 2007;Li et al 2009;Fang et al 2009;Arik and Yaldiz 2010;Deng et al 2010;Naser 2013;Zhang et al 2009b). The first national soil pollution status survey bulletin released on April 17, 2014 launched by the Ministry of Environmental Protection and Ministry of Land and Resources of the People's Republic of China demonstrated that the ratio of exceeding soil standards in all of the samples is 16.1 % and the rate of arable land reaches 19.4 %, while the ratio of Cd is 7.0 % in all of the samples.…”

Section: Introductionmentioning

confidence: 99%

Contamination assessment of arsenic and heavy metals in a typical abandoned estuary wetland—a case study of the Yellow River Delta Natural Reserve

Xie

Sun

Zhang

et al. 2014

Environ Monit Assess

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Coastal and estuarine areas are often polluted by heavy metals that result from industrial production and agricultural activities. In this study, we investigated the concentration trait and vertical pattern of trace elements, such as As, Cd, Ni, Zn, Pb, Cu, and Cr, and the relationship between those trace elements and the soil properties in coastal wetlands using 28 profiles that were surveyed across the Diaokouhe Nature Reserve (DKHNR). The goal of this study is to investigate profile distribution characteristics of heavy metals in different wetland types and their variations with the soil depth to assess heavy metal pollution using pollution indices and to identify the pollution sources using multivariate analysis and sediment quality guidelines. Principal component analysis, cluster analysis, and pollution level indices were applied to evaluate the contamination conditions due to wetland degradation. The findings indicated that the concentration of trace elements decreased with the soil depth, while Cd increases with soil depth. The As concentrations in reed swamps and Suaeda heteroptera surface layers were slightly higher than those in other land use types. All six heavy metals, i.e., Ni, Cu, As, Zn, Cr, and Pb, were strongly associated with PC1 (positive loading) and could reflect the contribution of natural geological sources of metals into the coastal sediments. PC2 is highly associated with Cd and could represent anthropogenic sources of metal pollution. Most of the heavy metals exhibited significant positive correlations with total concentrations; however, no significant correlations were observed between them and the soil salt and soil organic carbon. Soil organic carbon exhibited a positive linear relationship with Cu, Pb, and Zn in the first soil layer (0-20 cm); As, Cr, Cu, Ni, Pb, and Zn in the second layer (20-40 cm); and As, Cr, Cu, Ni, Pb, and Zn in the third layer (40-60 cm). Soil organic carbon exhibited only a negative correlation with Cd (P<0.05), in the second and third layers. As, Cr, Cu, Ni, Pb, and Zn exhibited lower geoaccumulation index values (I geo values), which averaged less than 0 in the three soil layers, this finding indicates that the soils have remained unpolluted by these heavy metals. The mean concentrations of these trace elements were lower than Class I criteria. The degradation wetland restoration suggestions have also been provided in such a way as to restore the reserved flow path of the Yellow River. The results that are associated with trace element contamination would be helpful in providing scientific directions to restore wetlands across the world.

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Heavy metals in coastal wetland sediments of the Pearl River Estuary, China

Cited by 229 publications

References 29 publications

Heavy metal pollution in sediments of a typical mariculture zone in South China

Heavy metal pollution in sediments of a typical mariculture zone in South China

Environmental status of Daya Bay surface sediments inferred from a sequential extraction technique

Contamination assessment of arsenic and heavy metals in a typical abandoned estuary wetland—a case study of the Yellow River Delta Natural Reserve

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