Naturally produced adsorbable organic halogens (AOX) in humic substances from soil and water

Asplund, G.; Grimvall, Anders; Pettersson, Catharina

doi:10.1016/0048-9697(89)90130-7

Cited by 87 publications

(32 citation statements)

References 6 publications

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“…In addition to contributing Cl inorg to the soil, litterfall may represent a substantial source of Cl org to soil systems (Ö berg and Grøn, 1998;Ö berg et al, 2005); various individual Cl org compounds have been isolated from the tissues of higher plants (Engvild, 1986). Small amounts of Cl org likely enter the soil through atmospheric deposition as well (Asplund et al, 1989). However, Cl org concentrations measured in the soil are believed to exceed contributions from litterfall and atmospheric deposition.…”

Section: Introductionmentioning

confidence: 99%

“…Cl inorg was (and often still is) presumed sufficiently unreactive in soil environments for use as a tracer in hydrological studies (Christophersen and Neal, 1990;Derby and Knighton, 2001). Recent studies using the adsorbable organohalogen (AOX) sum parameter technique (Asplund et al, 1989;Asplund and Grimvall, 1991) and X-ray spectroscopy (Myneni, 2002a;Leri et al, 2006) revealed Cl org to be surprisingly prevalent in forest soils, appearing in concentrations too high to be ascribed to anthropogenic sources.…”

Section: Introductionmentioning

confidence: 99%

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X-ray spectromicroscopic investigation of natural organochlorine distribution in weathering plant material

Leri

Marcus

Myneni

2007

Geochimica et Cosmochimica Acta

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

X-ray spectromicroscopic investigation of natural organochlorine distribution in weathering plant material

Leri

Marcus

Myneni

2007

Geochimica et Cosmochimica Acta

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“…Enrichment of chlorine in soil solution or groundwater compared to rainwater is mainly attributed to evapotranspiration. Retention of chlorine in soils through the formation of organochlorines or release of chloride during organic matter decay has been reported (Asplund et al, 1989;Flodin et al, 1997) but is of minor importance for the overall budget of chlorine in soil solution. Data on bromine or iodine budgets in soils or peat bogs could not be found in the literature.…”

Section: Halogens In Pore Watermentioning

confidence: 99%

Halogens in pore water of peat bogs – the role of peat decomposition and dissolved organic matter

et al. 2006

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Abstract.Halogens are strongly enriched in peat and peatlands and such they are one of their largest active terrestrial reservoir. The enrichment of halogens in peat is mainly attributed to the formation of organohalogens and climatically controlled humification processes. However, little is known about release of halogens from the peat substrate and the distribution of halogens in the peat pore water. In this study we have investigated the distribution of chlorine, bromine and iodine in pore water of three pristine peat bogs located in the Magellanic Moorlands, southern Chile. Peat pore waters were collected using a sipping technique, which allows in situ sampling down to a depth greater than 6 m. Halogens and halogen species in pore water were determined by ion-chromatography (IC) (chlorine) and IC-ICP-MS (bromine and iodine). Results show that halogen concentrations in pore water are 15-30 times higher than in rainwater. Mean concentrations of chlorine, bromine and iodine in pore water were 7-15 mg l −1 , 56-123 µg l −1 , and 10-20 µg l −1 , which correspond to mean proportions of 10-15%, 1-2.3% and 0.5-2.2% of total concentrations in peat, respectively. Organobromine and organoiodine were the predominant species in pore waters, whereas chlorine in pore water was mostly chloride. Advection and diffusion of halogens were found to be generally low and halogen concentrations appear to reflect release from the peat substrate. Release of bromine and iodine from peat depend on the degree of peat degradation, whereas this relationship is weak for chlorine. Relatively higher release of bromine and iodine was observed in less degraded peat sections, where the release of dissolved organic carbon (DOC) was also the most intensive. It has been concluded that the release of halogenated dissolved organic matter (DOM) is the predominant mechanism of iodine and bromine release from peat.

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“…Currently the common assumption that chloride is conservative in soils and can be used as a groundwater tracer is being questioned, and an increasing number of studies indicate that chloride can be retained in soils. In past it was not understood that the processes of decomposition of organic matter in the forest environment (Eriksson et al 1990) proceed with the participation of chlorine and microorganisms (Asplund et al 1989). However, rather than being inert, it seems that chloride participates in complex biogeochemical cycles involving the formation, leaching, degradation and volatilization of Cl org .…”

Section: Biogeochemical Cycling Of Chlorine and Chlorination In The Fmentioning

confidence: 99%

Biogeochemical cycles of chlorine in the coniferous forest ecosystem: practical implications

Matucha¹,

Clarke²,

Lachmanová³

et al. 2010

PLANT SOIL ENVIRON

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Chlorine -one of the most widespread elements on the Earth -is present in the environment as chloride ion or bound to organic substances. The main source of chloride ions is the oceans while organically bound chlorine (OCl) comes from various sources, including anthropogenic ones. Chlorinated organic compounds were long considered to be only industrial products; nevertheless, organochlorines occur plentifully in natural ecosystems. However, recent investigations in temperate and boreal forest ecosystems have shown them to be products of biodegradation of soil organic matter under participation of chlorine. It is important to understand both the inorganic and organic biogeochemical cycling of chlorine in order to understand processes in the forest ecosystem and dangers as a result of human activities, i.e. emission and deposition of anthropogenic chlorinated compounds as well as those from natural processes. The minireview presented below provides a survey of contemporary knowledge of the state of the art and a basis for investigations of formation and degradation of organochlorines and monitoring of chloride and organochlorines in forest ecosystems, which has not been carried out in the Czech Republic yet.

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Naturally produced adsorbable organic halogens (AOX) in humic substances from soil and water

Cited by 87 publications

References 6 publications

X-ray spectromicroscopic investigation of natural organochlorine distribution in weathering plant material

X-ray spectromicroscopic investigation of natural organochlorine distribution in weathering plant material

Halogens in pore water of peat bogs – the role of peat decomposition and dissolved organic matter

Biogeochemical cycles of chlorine in the coniferous forest ecosystem: practical implications

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