Magnetic Properties and Heavy-metal Contents of Contaminated Seabed Sediments of Penny's Bay, Hong Kong

Chan, Lungsang; Ng, SM; Davis, AM; Yim, Wyss W. -S.; Yeung, C.H

doi:10.1016/s0025-326x(00)00203-4

Cited by 97 publications

(32 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The deeper sediments had an average Pb concentration of 37.5 mg/kg, higher than the baseline concentration in Hong Kong marine sediment (see Table 3 to the use of leaded gasoline in the territory and to the discharges of industrial wastewater (Yim, 1984;Wong, 1987;Chan et al, 2001). …”

Section: Temporal Distribution Of Trace Metals In Harbour Sedimentsmentioning

confidence: 90%

The spatial and temporal distribution of heavy metals in sediments of Victoria Harbour, Hong Kong

Tang

Zhang

et al. 2008

Marine Pollution Bulletin

View full text Add to dashboard Cite

Victoria Harbour has received substantial loadings of pollutants from industrial and municipal wastewater discharged since the 1950s. Inputs of contaminants have declined dramatically during the last two decades as a result of better controls at the source and improved wastewater treatment facilities. To assess the spatial and temporal changes of metal contaminants in sediments in Victoria Harbour, core and grab sediments were collected. The central harbour areas were generally contaminated with heavy metals. The spatial distribution of trace metals can probably be attributed to the proximity of major urban and industrial discharge points, and to the effect of tidal flushing in the harbour. In the sediment cores, the highest concentrations of trace metals were observed to have accumulated during the 1950s to 1980s, corresponding with the

show abstract

Section: Temporal Distribution Of Trace Metals In Harbour Sedimentsmentioning

confidence: 90%

The spatial and temporal distribution of heavy metals in sediments of Victoria Harbour, Hong Kong

Tang

Zhang

et al. 2008

Marine Pollution Bulletin

View full text Add to dashboard Cite

show abstract

“…Concentrations of magnetic minerals were decreased from nearshore to seaward due to prevailing hydrodynamic conditions. The ranges of magnetic susceptibility in coastal sediments are higher when compared with the dust and top soil samples collected from Visakhapatnam city (Goddu et al 2004), because the concentration of magnetic minerals in the marine sediments was derived from shipping-related activities (Chan et al 2001), incomplete combustion of fossil fuels from the thermal power plant and treated and untreated effluents from metallurgical industries and smelters present in the study area.…”

Section: Magnetic Concentration-dependent Parametersmentioning

confidence: 97%

“…Magnetic measurements have been employed recently by number of authors in examining the anthropogenic inputs into lakes, as well as stream and marine sediments (Scholger 1998;Chan et al 2001;Chaparro et al 2011;Venkatachalapathy et al 2010Venkatachalapathy et al , 2011a. By measuring magnetic susceptibility, Kapicka et al (1999) outlined pollution spatial distribution and pollution load near the coal-burning power plant.…”

Section: Introductionmentioning

confidence: 99%

Environmental magnetic studies on surface sediments: a proxy for metal and hydrocarbon contamination

Venkatachalapathy

Rajeswari

Basavaiah

et al. 2013

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

Visakhapatnam is one of the major port cities, and it is developed into a hub of many large-and mediumscale industries. Due to growing industrialization and urbanization, coast is vulnerable to both organic and inorganic micro-pollutants. Twenty-five surface sediments were collected along the Visakhapatnam coast for the measurement of texture size, petroleum hydrocarbons, trace metals and environmental magnetic parameters. The percentage of coarser particles was more in the northern region, whereas the percentage of fine particles was increased toward south. Elevated levels of petroleum hydrocarbons and trace metals were attributed due to marine and land-based sources, in particular, those were due to shipping activities, treated and partially treated sewage and industrial wastes. The concentrations of trace metals, petroleum hydrocarbons and magnetic minerals were decreased from nearshore to seaward. Our results revealed that the magnetic mineralogy is dominated by magnetite with a small proportion of hematite, and the grain size of magnetic minerals was in the range of pseudo-single domain to multidomain nature with detrital origin. From the principal component analysis, the magnetic concentration and mineralogy-dependent parameters co-vary with the heavy metal and PHC concentrations, suggesting that the inputs of magnetic minerals, petroleum hydrocarbons and heavy metals in the Visakhapatnam shelf sediments were derived from the same anthropogenic sources. Thus, the large magnetic dataset can be used to reduce the number of chemical analysis; hence, environmental magnetic parameters were used as a proxy for both organic and inorganic micro-pollutants.

show abstract

“…An important approach to the subject is related to the sedimentary record of this anthropogenic influence, which incorporates high resolution geochronology with proxies of different types so as to provide a reliable documentation of the contamination history of a given area (ALVE, 1991(ALVE, , 1995PLATER et al, 1998;APPEBY, 2004;LI et al, 2000;CHAN et al, 2001;CEARRETA et al, 2002;RUIZ-FERNÁNDEZ et al, 2007, among others). Fox et al (1999) studied metal levels (As, Cr, Cu, Pb, Hg and Zn), radionuclides ( 137 Cs,238 Pu, 239+240 Pu and 241 Am) and DDT in the Mersey Estuary (UK).…”

Section: Introductionmentioning

confidence: 99%

Anthropogenic influences in a lagoonal environment: a multiproxy approach at the valo grande mouth, Cananéia-Iguape system (SE Brazil)

et al. 2009

View full text Add to dashboard Cite

A B S T R A C TThe Cananéia-Iguape system, SE Brazil, consists of a complex of lagoonal channels, located in a United Nations Educational, Scientific and Cultural Organization (UNESCO) Biosphere Reserve. Nevertheless, important environmental changes have occurred in approximately the last 150 yrs due to the opening of an artificial channel, the Valo Grande, connecting the Ribeira de Iguape River to the lagoonal system. Our objective is to assess the historical record of the uppermost layers of the sedimentary column of the lagoonal system in order to determine the history of environmental changes caused by the opening of the artificial channel. In this sense, an integrated geochemicalfaunal approach is used. The environmental changes led significant modifications in salinity, in changes of the depositional patterns of sediments and foraminiferal assemblages (including periods of defaunation), and, more drastically, in the input of heavy metals to the coastal environment. The concentrations Pb in the core analyzed here were up to two times higher than the values measured in contaminated sediments from the Santos estuary, the most industrialized coastal zone in Brazil. R E S U M OO sistema Cananéia-Iguape (Sudeste do Brasil), consiste em um complexo de canais lagunares localizados no interior de uma Reserva da Biosfera (assim definida pela UNESCO). Não obstante, variações ambientais importantes ocorreram nos últimos 150 anos, devido à abertura de um canal artificial, o Valo Grande, conectando o Rio Ribeira de Iguape ao sistema lagunar. O objetivo deste trabalho foi determinar a história das variações ambientais no sistema lagunar, causadas pela abertura do canal artificial, através da análise das camadas superiores da coluna sedimentar de um testemunho coletado no sistema. Neste sentido, uma abordagem integrada, envolvendo variações geoquímicas e faunísticas foi utilizada. As variações ambientais ocorridas apontam para mudanças drásticas na salinidade, nos padrões de sedimentação, nas associações de foraminíferos (incluindo períodos azóicos) e, mais drasticamente, no aporte de metais para o sistema costeiro. As concentrações de Pb no testemunho coletado indicam valores duas vezes maiores do que os medidos em sedimentos contaminados do estuário de Santos, situado na zona costeira mais industrializada do Brasil.

show abstract

Magnetic Properties and Heavy-metal Contents of Contaminated Seabed Sediments of Penny's Bay, Hong Kong

Cited by 97 publications

References 30 publications

The spatial and temporal distribution of heavy metals in sediments of Victoria Harbour, Hong Kong

The spatial and temporal distribution of heavy metals in sediments of Victoria Harbour, Hong Kong

Environmental magnetic studies on surface sediments: a proxy for metal and hydrocarbon contamination

Anthropogenic influences in a lagoonal environment: a multiproxy approach at the valo grande mouth, Cananéia-Iguape system (SE Brazil)

Contact Info

Product

Resources

About