Modeling on adsorption–desorption of trace metals to suspended particle matter in the Changjiang Estuary

Zhang, Y. Y.; Zhang, E. R.; Zhang, J.

doi:10.1007/s00254-007-0781-z

Cited by 35 publications

(13 citation statements)

References 32 publications

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“…They absorb heat from the sun and so influence thermal structure and stratification (Sathyendranath et al 1991). Materials such as pesticides, heavy metals and radioisotopes are adsorbed onto the surface of particles, and the fate of these chemicals is then controlled by that of the particles, rather than the surrounding water (Zhang et al 2008). The particles scatter and absorb light and so reduce the depth of penetration of sunlight into the sea.…”

Section: Introductionmentioning

confidence: 99%

Evidence that satellites sense the cross-sectional area of suspended particles in shelf seas and estuaries better than their mass

Bowers

Braithwaite

2011

Geo-Mar Lett

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Quantitative algorithms for the remote sensing of suspended sediments in shelf seas and estuaries have traditionally sought to relate the signal sensed by the satellite radiometer to the mass of particles in suspension. In situ measurements presented in this paper, however, show that the irradiance reflection coefficient at the sea surface is more closely related to the cross-sectional area of particles in suspension than to their mass. Other optical properties (which in turbid water depend on particle area) can therefore be related directly to the reflection coefficient. To interpret satellite data in terms of mass concentration (for testing numerical models of suspended sediment transport, for example), it is necessary to know the relationship between the area and mass of the particles. For the 2008-2009 dataset presented here for western UK coastal waters, the particle cross-sectional area varies by a factor of 5 for particles of a given size and mass. The causes of this variation are currently poorly understood.

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Section: Introductionmentioning

confidence: 99%

Evidence that satellites sense the cross-sectional area of suspended particles in shelf seas and estuaries better than their mass

Bowers

Braithwaite

2011

Geo-Mar Lett

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“…One of the processes is the adsorption-desorption of trace metals in estuarine mixing zones. Salinity and pH have been found to strongly affect mobility and flux rates of trace metals [13] when they are carried by rivers to various estuarine/coastal systems around the world; for instance, in the Galveston Bay estuary in Texas [14], the San Francisco Bay Estuary in California [15], the Changjiang Estuary in China [16,17], the Bang Pakong Estuary in Thailand [18], the Scheldt Estuary in the Netherlands [19], and the Conwy Estuary in North Wales [20]. The ongoing saltwater intrusion in the world's estuaries may shift metal mobilization and precipitation landwards, the occurrence and effects of which are not well investigated.…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Distributions of Sr and Ba along an Estuarine River with a Large Salinity Gradient to the Gulf of Mexico

2016

Water

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Strontium and barium to calcium ratios are often used as proxies for tracking animal movement across salinity gradients. Many estuarine rivers face saltwater intrusion due to sea level rise, potentially causing changes in mobility and distribution of these metals upstream. From May 2013 to August 2015, monthly water samples were collected and in-situ measurements were performed at six sites along an estuary strongly affected by saltwater intrusion, the Calcasieu River, with salinity ranging from 0.02 to 29.50 Parts Per Thousand (ppt). Results showed that the total Sr concentration and the Sr/Ca ratio both increased significantly with increasing salinity. The average Sr concentration at the site closest to the Gulf of Mexico (Site 6) was 46.21 µmol/L, about 130 times higher than that of the site furthest upstream (Site 1, 0.35). The average Sr/Ca ratio at Site 6 (8.41 mmol/mol) was about three times the average Sr/Ca ratio at Site 1 (2.89). However, the spatial variation in total Ba concentration was marginal, varying from 0.36 to 0.47 µmol/L. The average Ba/Ca ratio at Site 1 (4.82 mmol/mol) was about 54 times the ratio at Site 6 (0.09), showing a negative relation between the Ba/Ca ratio and salinity. All elemental concentrations and ratios had considerable seasonal variations, with significant differences among sampling months for the Sr and Ba concentrations and the Ba/Ca ratio (p < 0.01). The results suggest that for low-gradient estuarine rivers such as the Calcasieu River, water chemistry upstream would experience substantial Sr and Ca enrichment, potentially affecting aquatic environments and biological communities.

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“…The adsorption kinetic curves of trace elements (e.g., Cd, Co, Cu, Ni, and Zn) show that the adsorption density increases asymptotically and then reaches stable values (i.e., equilibrium) in 5 h for Cu; 20 h for Zn, Co, and Ni; and up to 40 h for Cd (Zhang et al 2008b). In the experiments, the adsorption edges for trace elements onto SPM illustrates the sigmoid nature and that the E (%) increased considerably with higher pH values, in the range of pH = 6-9, but decreased as the concentration of SPM increased (Zhang 2003).…”

Section: Results Of Laboratory Simulationsmentioning

confidence: 98%

“…It has been observed that for a given percentage of adsorption (e.g., E = 50 %), the equilibrium pH increased considerably with higher salinities (e.g., ΔpH = 0.5-1.0 for a salinity range of 0-25). The Kurbatov adsorption model can be used to diagnose the characteristics of the exchange of chemical species between aqueous solution and active groups of SPM, and the change in adsorption density can be simulated by the Langmuir equation (Zhang et al 2008b). The adsorption of trace elements increases sharply from 10-20 % to 80-90 % within a rather narrow pH range of 6.5-8.5.…”

Section: Results Of Laboratory Simulationsmentioning

confidence: 99%

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Plant Nutrients and Trace Elements from the Changjiang Watersheds to the East China Sea

Zhang

2015

Estuaries of the World

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Over the last several decades, the Changjiang (Yangtze River) watersheds has suffered from an acceleration of economic activities and changing land-use patterns. Monitoring programs at downstream hydrological stations and data from field campaigns have shown that these changes have caused an increase in the loss of chemical elements (e.g., plant nutrients such as N, P, and Si) from catchment areas and changes in pollutant discharges (e.g., trace elements). Changes in plant nutrients and trace elements in the river have altered the partitioning of chemical species between water and solid phases (e.g., total suspended matter) in aquatic systems, in both freshwater and marine environments. Irreversible element partitioning in rivers and coastal waters can affect the bioavailability of chemical species in adjacent marine environments, which can in turn impact ecosystem structure and functioning. In the East China Sea, the continual increase in plant nutrient fluxes from land sources, such as the Changjiang, has caused eutrophication in surface waters of the coastal environment. The degradation of organic matter, either allochthonous or autochthonous in origin or both, has fueled heterotrophic processes that induce the seasonal depletion of dissolved oxygen (DO) and even hypoxia in the Changjiang Estuary and the inner shelf of the East China Sea. Based on observational hydrography and chemistry data, a box model approach is used in this study to describe the plant nutrient and trace element budgets. The results illustrate that incursion across the shelf break of the western boundary current system (i.e., Kuroshio) has a significant influence on the inventory and residence time of chemical elements such as plant nutrients on the East China Sea Shelf.

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Modeling on adsorption–desorption of trace metals to suspended particle matter in the Changjiang Estuary

Cited by 35 publications

References 32 publications

Evidence that satellites sense the cross-sectional area of suspended particles in shelf seas and estuaries better than their mass

Evidence that satellites sense the cross-sectional area of suspended particles in shelf seas and estuaries better than their mass

Spatiotemporal Distributions of Sr and Ba along an Estuarine River with a Large Salinity Gradient to the Gulf of Mexico

Plant Nutrients and Trace Elements from the Changjiang Watersheds to the East China Sea

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