Chlorinated pesticides and PCBs in sediments and molluscs from freshwater canals in the Hanoi region

Nhan, Dang Duc; Carvalho, Fernando P.; Manh, Nguyen Van; Tuấn, Nguyễn Quốc; Yen, Nguyen Thi Hai; Villeneuve, J. P.; Cattini, Chantal

doi:10.1016/s0269-7491(00)00149-4

Cited by 115 publications

(56 citation statements)

References 19 publications

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“…Concentrations of β-HCH measured in aquatic species from China , Vietnam (Nhan et al, 2001) or India (Kaur et al, 2008), countries that also widely used technical HCH, did not exceed 10 µg kg -1 w.w. while concentrations measured here averaged 51 µg kg -1 w.w. for molluscs and 219 µg kg -1 w.w. for fishes. Little is published about diffuse pollution of chlordecone due to an agricultural use.…”

Section: Oc Levels Measured In Guadeloupe Were Among the Highest Valumentioning

confidence: 92%

Organochlorine pollution in tropical rivers (Guadeloupe): Role of ecological factors in food web bioaccumulation

Coat¹,

Monti²,

Legendre³

et al. 2011

Environmental Pollution

122

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This paper determines the bioaccumulation and transfer processes of organochlorine pesticides within the stream food web in Guadeloupe (Caribbean). ABSTRACTConcentrations of organochlorine pesticides and stable isotope ratios of nitrogen and carbon were measured in a tropical freshwater ecosystem to evaluate the contamination level of biota and examine the bioaccumulation patterns of pollutants through the food web. Chemical analyses showed a general and heavy contamination of the entire food web. They revealed the strong accumulation of pollutants by juveniles of diadromous fishes and shrimps, as they re-enter the river. The role of ecological factors in the bioaccumulation of pesticides was evaluated. Whereas the most persistent pollutants (chlordecone and monohydro-chlordecone) were related to the organisms diet and habitat, bioaccumulation of β-HCH was only influenced by animal lipid content. The biomagnification potential of chlordecone through the food chain has been demonstrated. It highlighted the importance of trophic transfer in this compound bioaccumulation process. In contrast, bioconcentration by passive diffusion from water seemed to be the main exposure route of biota to β-HCH.

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Section: Oc Levels Measured In Guadeloupe Were Among the Highest Valumentioning

confidence: 92%

Organochlorine pollution in tropical rivers (Guadeloupe): Role of ecological factors in food web bioaccumulation

Coat¹,

Monti²,

Legendre³

et al. 2011

Environmental Pollution

122

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“…A most likely explanation for the current relatively lower concentrations of HCHs in sediments is due to the differences in physicochemical and biochemical properties, wherein HCHs have higher water solubility, vapor pressure and biodegradability, and lower lipophilicity and particle affinity compared to the DDTs. DDTs tend to remain in the particulate phase longer than HCHs (Nhan et al, 2001).…”

Section: Residue Levels Of Hch and Ddt In Sedimentsmentioning

confidence: 99%

Occurrence and distribution of organochlorine pesticides (HCH and DDT) in sediments collected from East China Sea

Yang

Jiang

Zhou

et al. 2005

Environment International

138

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Sediments used in this study were collected from different depths of eight sites in East China Sea in November 2002. The levels and distribution patterns of the selected organochlorine pesticides (OCPs = p,pV-DDT, o,pV-DDT, p,pV-DDE, p,pV-DDD, a-, h-, g-and y-HCH) in samples were investigated by the technique of sonication extraction followed by the analysis of gas chromatography (GC) coupled with a micro-electron capture detector (AECD). The concentrations of AHCH and ADDT in the surface sediments were in the range of < 0.05 -1.45 ng/g (mean 0.76 ng/g), < 0.06 -6.04 ng/g (mean 3.05 ng/g) based on dry weight (dw), respectively. In the vertical distributions, the AHCH and ADDT were in the range of < 0.05 -2.52 ng/g, < 0.06 -10.94 ng/g dw, respectively. Residues of OCPs varied significantly with different sampling sites. ADDT in the surface sediments was correlated well with total organic carbon (TOC) content (r 2 = 0.71), while AHCH showed no obvious correlation. The distribution showed that the sediments from the vicinity estuary or near shore had higher TOC contents, and higher OCPs concentrations. The contamination record indicated an extensive use of OCPs in the catchments from Yangtze River in the past might greatly affect the OCP residues. D

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“…The fact that carbon content was not dramatically different between the two microhabitats was not too surprising since the entire marsh will flood and drain with each tide making the depositional hydraulics similar. The normalization was performed since studies have shown predictable associations of lipophilic contaminants as well as MeHg with detrital carbon (Castro and Vale 1995;King et al 2001;Nhan et al 2001). However, other studies from the southeast have shown the relationship between Hg and carbon content to be complex (Kannan et al 1998b), most likely because carbon is only one component that can influence methylation processes.…”

Section: Home Rangementioning

confidence: 99%

Clapper rails as indicators of mercury and PCB bioavailability in a Georgia saltmarsh system

et al. 2008

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Mills, Gary L.; Garvin, N.; Stephens, Warren L. Jr.; Novak, James N.; and Brisbin, I. L. Jr., "Clapper rails as indicators of mercury and PCB bioavailability in a Georgia saltmarsh system" (2008 Abstract Clapper rails (Rallus longirostris) were used as an indicator species of estuarine marsh habitat quality because of their strong site fidelity and predictable diet consisting of mostly benthic organisms. Mercury (Hg) and the polychlorinated biphenyl (PCB) Aroclor 1268 concentrations were determined for sediments, crabs, as well as clapper rail adults and chicks collected from salt marshes associated with the LCP Superfund site in Brunswick, Georgia. Home ranges were established for adult rails, and sediment and crab samples were taken from each individual's range. The study was designed to minimize the spatial variability associated with trophic transfer studies by choosing an endpoint species with a potentially small home range and specifically sampling its foraging range. The mean home range for clapper rails was 1.2 ha with a median of 0.28 ha. Concentrations of Hg and Aroclor 1268 were shown to increase with each trophic level. Transfer factors between media followed the same pattern for both contaminants with the highest between fiddler crabs and clapper rail liver. Hg and PCB transfer factors were similar between sediment to fiddler crab and fiddler crab to muscle, however the PCB transfer factor from fiddler crabs to liver was over twice as large as for Hg. PCB congener profiles did not significantly differ between media types.

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Chlorinated pesticides and PCBs in sediments and molluscs from freshwater canals in the Hanoi region

Cited by 115 publications

References 19 publications

Organochlorine pollution in tropical rivers (Guadeloupe): Role of ecological factors in food web bioaccumulation

Organochlorine pollution in tropical rivers (Guadeloupe): Role of ecological factors in food web bioaccumulation

Occurrence and distribution of organochlorine pesticides (HCH and DDT) in sediments collected from East China Sea

Clapper rails as indicators of mercury and PCB bioavailability in a Georgia saltmarsh system

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