Effects of equilibration time on photoreactivity of the pollutant DDE sorbed on natural sediments

Zepp, Richard G.; Schlotzhauer, Patricia F.

doi:10.1016/0045-6535(81)90145-4

Cited by 26 publications

(16 citation statements)

References 6 publications

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“…These results are consistent with earlier studies that also demonstrated that DOC is very photoreactive and can be photochemically degraded in coastal ecosystems into DIC, including CO 2 and CO (Miller and Zepp 1995;Gao and Zepp 1998;Zepp 2002). Photodegradation plays an important role in the cycling of carbon within the ocean, both by complete photoxidation of OC to DIC and by photoproduction of low-molecular-weight substrates, which subsequently can be microbially degraded (Amon and Benner 1996;Opsahl and Benner 1998;Mopper and Kieber 2000).…”

Section: Resultssupporting

confidence: 92%

“…For example, Miller and Zepp (1979a) showed that photolysis rates of several aquatic pollutants were enhanced in the presence of suspended sediments due to the increased diffusiveness of light. Other studies indicate that the photoreactivity of hydrophobic organics can be altered when adsorbed to suspended sediments relative to the dissolved phase and that light screening may reduce the photoreactivity of more soluble, less hydrophobic organics (Miller and Zepp 1979b;Zepp and Schlotzhauer 1981).…”

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confidence: 99%

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Photochemical production of dissolved organic carbon from resuspended sediments

Kieber¹,

Whitehead²,

Skrabal³

2006

Limnol. Oceanogr.

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A series of controlled photolysis experiments using simulated sunlight was conducted in the presence and absence of estuarine bottom sediments to address the role of sediment resuspension on dissolved organic carbon (DOC) cycling in estuarine and coastal waters. In 0.2-mm-filtered estuarine water samples with no added sediment, DOC concentrations decreased from 0.4 to 3 mmol L 21 h 21 as a result of photooxidation. When 0.2-mm-filtered water samples with the addition of 1-2 grams of estuarine sediment per liter were irradiated, DOC was produced at rates of 3 to 150 mmol L 21 DOC per gram dry sediment. Photoproduction of DOC from resuspended sediments increased in direct proportion to the percent organic carbon content of the added sediment. Highenergy ultraviolet light was the most effective for photodegrading DOC in filtered samples and for photoproducing DOC from resuspended sediments. Photosynthetically active radiation (PAR; 400-700 nm) did not significantly degrade DOC in filtered water. However, PAR did produce half as much DOC from resuspended sediments in organic-rich regions of the estuary relative to full spectrum sunlight irradiations. The photoproduction of DOC from resuspended sediments, calculated for the top 1 m of coastal waters, resulted in fluxes that were significantly larger than benthic and riverine fluxes of DOC. Photoproduction from resuspended sediments therefore represents an episodically significant but previously unrecognized source of DOC to estuarine and coastal ecosystems receiving large sediment plumes.

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Section: Resultssupporting

confidence: 92%

mentioning

confidence: 99%

Photochemical production of dissolved organic carbon from resuspended sediments

Kieber¹,

Whitehead²,

Skrabal³

2006

Limnol. Oceanogr.

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“…In general, rapid loss of dye occurred initially, followed by a period during which prolonged irradiation produced a much slower rate of loss. The same type of disappearance kinetics has been reported for the photolysis of octachlorodibenzo-p-dioxin [23] and several agrochemicals [4] on soil surfaces, and for the photolysis of DDE sorbed to suspended sediments [24]. This type of kinetic behavior is attributed to a bulk light attenuation effect and/or an inner particle shielding effect.…”

Section: Photolysis Kineticssupporting

confidence: 68%

Photolysis of Smoke Dyes on Soils

Adams¹,

Weber²,

Baughman³

1994

Environ Toxicol Chem

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Photolysis of an azo, a quinophthalone, and several anthraquinone smoke dyes was studied on soil surfaces. Initially, rapid photodegradation of each dye occurred, followed by a period of much slower rate of loss, indicating that the remaining fraction of the dye was photochemically protected. The average mean depths of photolysis ranged from 0.33 to 0.68 mm for outdoor studies and from 0.42 to 0.73 mm for lab studies. The magnitude of the mean depths of photolysis suggests that photodegradation. of the dyes occurs through indirect photochemical processes. Photolysis products for only two of the dyes could be identified. Photolysis of Disperse Red 9 resulted in the formation of 1-aminoanthraquinone, whereas Solvent Yellow 33 photodegraded to give 2-carboxyquinoline and phthalic anhydride. Reaction mechanisms involving sensitized photo-oxidation by singlet oxygen are consistent with the formation of these reaction products. Keywords-Smoke dyesPhotolysis Soil Singlet oxygen Griffiths, J. and C. Hawkins. 1977 Oxidation by singlet oxy gen of arylazo naphthols exhibiting azo-hydrazone tautomerism J Chem Soc Perkin Trans 11747-752 Gnffiths, J. and C. Hawkins. 1977 Synthesis and photochem ical stability of 1-phenylazo 2 naphthol dyes containing insulated singlet oxygen quenching groups J Appl Chem Bioiechnol 21 558-564

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“…Another family of pollutants regroups the organic aqueous pollutants (pharmaceuticals and molecules with high molecular mass) that are released in nature by chemical industries, creating serious environmental issues due to their high toxicity, even at low concentrations (Chuang et al 2008;Tzompantzi et al 2011). The interest in finding new sorbent for removing such compounds from water increased in the last ten years, even if the toxicity and the possibility to adsorb these pollutants by natural materials is known since the '80 (Zepp and Schlotzhauer 1981;Karickhoff 1984). Sorption is one of the most common treatment to remove organic pollutants from nature; LDHs and derived mixed oxides are great candidates thanks to the high sorption capacity in the interlayer region, the large specific surface area and the presence of reactive surfaces (Pavan et al 1999(Pavan et al , 2000Seki and Yurdakoç 2005;Chuang et al 2008).…”

Section: -mentioning

confidence: 99%

Layered double hydroxides and LDH-derived materials in chosen environmental applications: a review

Chaillot

Bennici

Brendlé

2020

Environ Sci Pollut Res

103

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With increasing global warming awareness, layered double hydroxides (LDHs), hydrotalcites and their related materials are key components to reduce the environmental impact of human activities. Such materials can be synthesized quickly with high efficiency by using different synthesis processes. Moreover, their properties tunability is appreciated in various industrial processes. Regarding their physical and structural properties, such materials can be applied in environmental applications such as the adsorption of atmospheric and aqueous pollutants, the hydrogen production, or the formation of 5-Hydroxymethylfurfural (5-HMF). After a first part dedicated to the synthesis processes of hydrotalcites, the present review reports on specific environmental applications chosen as example in various fields (green chemistry and depollution) that have gained increasing interest in the last decades, enlightening the links between structural properties, synthesis route and application using the lamellar materials.

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Effects of equilibration time on photoreactivity of the pollutant DDE sorbed on natural sediments

Cited by 26 publications

References 6 publications

Photochemical production of dissolved organic carbon from resuspended sediments

Photochemical production of dissolved organic carbon from resuspended sediments

Photolysis of Smoke Dyes on Soils

Layered double hydroxides and LDH-derived materials in chosen environmental applications: a review

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