Adsorption and concentration of dissolved carbon-14 DDT by coloring colloids in surface waters

Poirrier, Michael A.; Bordelon, Billy Ray; Laseter, John L.

doi:10.1021/es60071a011

Cited by 65 publications

(31 citation statements)

References 6 publications

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“…Os compostos húmicos coloidais oferecem uma área superficial grande, apropriada para a adsorção de matéria orgânica e inorgânica (Poirrier et al, 1972). No período chuvoso, aumenta a entrada de matéria orgânica oriunda do manguezal nos ecossistemas aquáticos adjacentes.…”

Section: Discussionunclassified

Influência Das Variáveis Ambientais Na Qualidade Da Água De Uma Lagoa Costeira Tropical No Norte Do Brasil

Pereira

Neto

Moura

et al. 2017

ACMAR

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RESUMOAs lagoas costeiras exercem funções importantes de natureza ecológica e socioeconômica, devido à sua alta produtividade e ao uso múltiplo de suas águas. O objetivo desta pesquisa foi avaliar a variação temporal de algumas variáveis ambientais da água da Lagoa Salina (nordeste do Pará), cuja dinâmica apresenta características peculiares, variando em função da sazonalidade, das grandes marés de sizígia e das substâncias húmicas oriundas do manguezal, predominante na bacia de drenagem. A água foi monitorada, mensalmente, durante doze meses, com base nos valores de temperatura, salinidade, oxigênio dissolvido, pH, condutividade elétrica, turbidez, transparência, profundidade e pluviosidade. Os resultados mostraram que somente as variáveis, salinidade, condutividade e pH, apresentaram diferença significativa entre os períodos chuvoso e seco, indicando a influência da pluviosidade. A Análise de Componentes Principais explicou 71,9% da variação dos dados, com o Componente 1 refletindo a influência da sazonalidade sobre transparência da água, condutividade e pluviosidade, e o Componente 2 refletindo a influência das marés de sizígia e do início do período chuvoso sobre pH e turbidez. Todas essas características estabelecem, em determinados períodos, condições extremas à biota aquática.Palavras-chaves: lagoa tropical, sazonalidade, maré de sizígia. ABSTRACTThe coastal lagoons play important ecological and socio-economic roles due of their high productivity and multiple uses of the water. This research aimed to evaluate the time variation of a

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Section: Discussionunclassified

Influência Das Variáveis Ambientais Na Qualidade Da Água De Uma Lagoa Costeira Tropical No Norte Do Brasil

Pereira

Neto

Moura

et al. 2017

ACMAR

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“…For a site with an annual rainfall of 1000 mm/year a maximum of 13 g DDT/ha per year could potentially be leached as a saturated solution (DDT solubility of 1.3 |ag/l) assuming no evapotranspiration. The solubility and hence movement of residues may, however, be enhanced by association with organic matter (Ballard 1971;Poirrier et al 1972). Some downward movement of DDT sorbed to paniculate matter through soil pores and cracks is also possible.…”

Section: Leaching Run-off and Erosionmentioning

confidence: 99%

“…Erosion and run-off are likely to be more important in the movement of DDT (Cramer 1973), as soil particles transported in run-off water have been reported to contain sorbed DDT (Poirrier et al 1972;Pierce et al 1974;Bobovnikova et al 1983;Gambrell & Patrick 1988). Loss of pesticides with run-off is affected by topography, soil type, plant canopy, and rainfall/irrigation (Bobovnikova et al 1983;Thoma & Nicholson 1989).…”

Section: Leaching Run-off and Erosionmentioning

confidence: 99%

DDT residues in the environment—A review with a New Zealand perspective

Boul¹

1995

New Zealand Journal of Agricultural Research

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“…These include centrifugation (Poirrier et al, 1972), gel permeation (Hassett and Anderson, 1979;Wijayaratne and Means, 1984a), reversed phase liquid chromatography (Landrum et al, 1984), ultrafiltration (Means and Wijayaratne, 1982;Wijayaratne and Means, 1984b), volatilization kinetics (Hassett and Millcic, 1985), equilibrium dialysis Suffett, 1982,1983;Landrum et al, 1984;McCarthy and Jimenez, 1985b), and recently equilibrium headspace partitioning (Garbarini and Lion, 1985). With the exception of dialysis and headspace partitioning, these techniques potentially suffer from uncertainties derived from incomplete phase separations, disequilibria caused during phase separations, or sorptive exchange of HOC with container walls and other surfaces during phase separation.…”

Section: Organization Of This Dissertationmentioning

confidence: 99%

The role of colloidal organic matter in the marine geochemistry of PCBs

Brownawell¹

1986

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WITHDRAWN AD -sT~i~Bñ~c i~tZ4-2-ABSTRACT Polychlorinated biphenyls (PCBs) were used as model hydrophobic organic compounds (HOC) to study physical-chemical processes which affect the speciation and fate of HOC in coastal environments. The focus of this study is on the sorption of PCBs with colloidal organic matter in seawater, and the influence of this process on the distribution of PCBs in coastal sediments. Laboratory and field experiments were used to make quantitative estimates of PCB-organic matter sorption, and to test predictions of three-phase equilibrium models.A static headspace partitioning method was developed to measure the sorption of several individual chlorobiphenyls with colloidal organic matter enriched from coastal seawater by hollow fiber ultrafiltration. This technique directly measured the dissolved phase fugacity of PCBs in experimental bottles, and avoided uncertain separation techniques often used in isolating various chemical phases. Colloidal organic carbon normalized partition coefficients (Koc) were determined from linear sorption isotherms, and increased from 1.9 x 10' (L/Kg) for 2,4'-dichlorobiphenyl to 3.5 x 10 s for 2,2',3,4,5'-pentachlorobiphenyl. Sorption tended to increase with increasing octanol-water partition coefficients (Kow) of the sorbate, and values of Koc were within a range of those reported in other experimental sorption studies with sediments and dissolved humic substances. Experimental partitioning results support the hypothesis that HOC-organic colloid sorption is similar to HOC sorption by sediment organic matter.PCBs were measured in the interstitial waters and sediments of three box cores obtained from New Bedford Harbor and Buzzards Bay, Massachusetts. The three sites studied had a wide range of sediment PCB concentrations, and reducing conditions provided environments containing high concentrations of colloidal organic matter. Dissolved organic carbon (DOC) and total sediment organic carbon (TOC) were measured in two cores to test the role of organic matter on the observed partitioning of PCBs. PCB concentrations, particularly those of less soluble chlorobiphenyls, were highly elevated in interstitial waters compared to water column concentrations at all three sites. The measured apparent distribution coefficients (K'd) of individual chlorobiphenyls did not increase with hydrophobicity (Kow) and indicate that a large fraction of PCBs in interstitial waters must be sorbed to organic colloids. A three-phase equilibrium sorption model, in which dissolved PCBs are in a dynamic equilibrium with colloidal and sediment organic matter, accounts for many aspects of the field data. There is good agreement of observed partitioning at New Bedford Station 67 and Buzzards Bay Station M with model calculations based on predictions derived from laboratory experiments of HOC sorption with sediments and organic colloids, but model calculations underpredict K'd at Station 84 in New Bedford Harbor.-3-The sediment-interstitial water results were contrasted with a study of PCB pa...

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Adsorption and concentration of dissolved carbon-14 DDT by coloring colloids in surface waters

Cited by 65 publications

References 6 publications

Influência Das Variáveis Ambientais Na Qualidade Da Água De Uma Lagoa Costeira Tropical No Norte Do Brasil

Influência Das Variáveis Ambientais Na Qualidade Da Água De Uma Lagoa Costeira Tropical No Norte Do Brasil

DDT residues in the environment—A review with a New Zealand perspective

The role of colloidal organic matter in the marine geochemistry of PCBs

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