Mechanisms of land–sea interactions – the distribution of metals and sedimentary organic matter in sediments of a river-dominated Mediterranean karstic estuary

Sondi, Ivan; Lojen, Sonja; Juračić, Mladen; Prohić, Esad

doi:10.1016/j.ecss.2008.07.001

Cited by 42 publications

(17 citation statements)

References 39 publications

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“…Because Pb was previously added to gasoline [43], the use of gasoline-powered machines represents another anthropogenic source of Pb. Furthermore, the [26,34,44]. Therefore, the results of this study clearly demonstrate that agricultural intensification has resulted in an increasing use of phosphate fertilizer and is the main source of metal accumulation in the estuarine sediments of the agricultural region of Chaohu Lake Valley.…”

Section: Cluster Analysismentioning

confidence: 58%

“…In the ten estuaries, the total concentrations were as follows: Cd, 0. [34]. In Chaohu Lake Valley, the land use pattern has been unchanged for more than half a century [22]; therefore, the increased metal content may be the consequence of agricultural intensification, which has developed rapidly in East China since the 1980s.…”

Section: Spatial-vertical Distribution Of Heavy Metal Contents In Thementioning

confidence: 99%

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Heavy metal sources and associated risk in response to agricultural intensification in the estuarine sediments of Chaohu Lake Valley, East China

Tang

Shan

Zhang

et al. 2010

Journal of Hazardous Materials

203

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a b s t r a c tIn this study, the source and risk associated with heavy metals in the estuarine sediments of Chaohu Lake Valley in East China were studied. The results demonstrated that most metal contents (Cd, Pb and Zn) increased continuously from 0.21, 8.05 and 73.76 mg/kg in the substrate to 0.33, 17.20 and 100.22 mg/kg in the surface sediments on average, respectively, in all ten estuaries evaluated. In addition, the high proportion of chemically reactive forms of Cd (18.10-33.60%) implied a moderately high risk, while the risk associated with Pb and Zn was moderate in most estuaries. Enrichment factor (EF) and cluster analysis (CA) were conducted to assess the metal sources. The EF values of Cd, Pb and Zn (4.96, 3.68 and 2.25, respectively) indicated that they had accumulated in the estuarine sediments. Additionally, CA suggested that their primary sources were anthropogenic, namely the extensive use of fertilizers. Therefore, heavy metal pollution due to agricultural intensification in Chaohu Lake Valley should be taken into account during the formation of valley management strategies for the water environment.

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Section: Cluster Analysismentioning

confidence: 58%

Section: Spatial-vertical Distribution Of Heavy Metal Contents In Thementioning

confidence: 99%

Heavy metal sources and associated risk in response to agricultural intensification in the estuarine sediments of Chaohu Lake Valley, East China

Tang

Shan

Zhang

et al. 2010

Journal of Hazardous Materials

203

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“…Coastal zones and shallow marine areas are among the most productive ecosystems in the world (Glantz, 1992). Estuaries receive the total continental sediment load, and are frequently sites of major population centres, and so strongly affected by anthropogenic pollution (Sondi et al, 2008). The load of sediment and pollutants transported from land into estuaries exerts impacts on the marine environment, biogeochemical characteristics and the transport cycle of inorganic compounds (Fulton et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Effects of temperature change on water discharge, and sediment and nutrient loading in the lower Pearl River basin based on SWAT modelling

Chen

Wang

et al. 2011

Hydrological Sciences Journal

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The impact of climate change on hydrological processes and nutrient input is one of the major uncertainties in projecting future global warming. The Soil and Water Assessment Tool (SWAT) model is applied to simulate the effects of temperature on the hydrology and sediment and nutrient load in the lower Pearl River Basin, South China. Calibration and validation results for SWAT showed that the Yamen estuary is appropriate for simulating the impacts of temperature change on both hydrological processes and nutrient input. The possible temperature change scenarios were set at T-2, T-1.5, T-1, T-0.5, T+0.5, T+1, T+1.5, T+2, T+2.5, T+3 • C compared to the current temperature, T• C. The results showed that the relative variation of discharge with temperature was slight. The sediment load at T+3• C is increased by 13.58% compared to that at T • C. Inorganic N and P inputs to the Yamen estuary showed an increasing trend with the temperature increase from T-2• C to T+3 • C. Global warming can reduce the vegetation land cover by slowing plant growth, which will aggravate the water and soil loss. Temperature changes would have an effect on mineralization and nitrification by changing soil temperature and temperatures. The warming is projected to cause an increase of sediment and nutrient load into the estuary and accelerate eutrophication in the coastal area.

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“…Small-sized clay mineral particles exhibit the physico-chemical characteristics of colloidal particles and are suitable for numerous catalytic, ceramic, and engineering applications, owing their applicability to a large specific surface area and surface reactivity. Biogeochemical processes in soils and aquatic sediments are mainly governed by physico-chemical reactions at the surface of their colloidal constituents, particularly clay minerals (Sondi et al, 1994(Sondi et al, , 2008. These processes are governed by their electrokinetic properties, large specific surface area and high cation exchange capacity (Sondi and Pravdić, 1998;Churchman at al., 2006).…”

Section: Introductionmentioning

confidence: 99%

The surface properties of clay minerals modified by intensive dry milling — revisited

Vdović

Jurina

Škapin

et al. 2010

Applied Clay Science

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The present study broadened the research on the effect of the intensive physical disintegration of clay minerals (kaolinite and "Otay" montmorillonite) and mica (ripidolite), carried out by high-energy ball milling (HEBM), on their surface physicochemical characteristics, i.e., the specific surface area (SSA), the cation exchange capacity (CEC), and the electrokinetic properties. The mechanical disintegration of clay minerals occurred in two consecutive processes. Significant changes of the size, morphology and structure were followed by the change of the physico-chemical properties. The decrease of the particle size of the clay minerals resulted in significant increases in the SSA and CEC values, and in the exposure of new, amphoteric surfaces, significantly changing the electrophoretic mobility (EPM).Prolonged milling produced amorphous alumina-silicate aggregates. These solids exhibited the same morphological properties, SSA and CEC, despite the fact that they were formed from initially different clay minerals. In contrast, the electrophoretic mobility of these samples was significantly changed, exemplifying the significance of the initial chemical composition and the formation of different types of surface structures on the physico-chemical processes at amorphous solid-surface-liquid interfaces.

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Mechanisms of land–sea interactions – the distribution of metals and sedimentary organic matter in sediments of a river-dominated Mediterranean karstic estuary

Cited by 42 publications

References 39 publications

Heavy metal sources and associated risk in response to agricultural intensification in the estuarine sediments of Chaohu Lake Valley, East China

Heavy metal sources and associated risk in response to agricultural intensification in the estuarine sediments of Chaohu Lake Valley, East China

Effects of temperature change on water discharge, and sediment and nutrient loading in the lower Pearl River basin based on SWAT modelling

The surface properties of clay minerals modified by intensive dry milling — revisited

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