Lipids of Recent sediments, Part I: Straight-chain hydrocarbons and carboxylic acids of some temperate lacustrine and sub-tropical lagoonal/tidal flat sediments

Brooks, Paul; Eglinton, G.; Gaskell, Simon J.; McHugh, Dennis J.; Maxwell, James R.; Philp, R. Paul

doi:10.1016/0009-2541(76)90058-9

Cited by 114 publications

(18 citation statements)

References 36 publications

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“…On the other hand, the statement that most of unbound HFA's generated on heating come from the "tightly bound" HFA's may be supported by the followings. HFA's are derived mainly from higher plants which grow on soils around lake (KVENVOLDEN, 1967;BROOKS et al ., 1976;CRANWELL, 1974CRANWELL, , 1978ISHIWATARI and HANYA , 1973;ISHIWATARI et al ., 1980;MATSUDA and KOYAMA, 1977). Since the plant-derived HFA's are subjected to microbial attack in soils and river water during their transportation into the lake, these HFA's lose a part of their unbound + bound forms or are converted into the "tightly bound" form.…”

Section: Discussionmentioning

confidence: 99%

Experimental diagenesis of fatty acids in a sediment: Changes in their existence forms upon heating.

Kawamura

Ishiwatari

1981

Geochem. J.

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Heating experiments of a lacustrine sediment were conducted at 120, 150 and 198°C for 48hrs each for better understanding the behavior of fatty acids (FA's) in a sediment during early diagenesis. Two forms of FA's, "unbound FA's" extracted with organic solvents and "bound FA's" recovered by saponi fication. of the pre-extracted sediments, were determined on unheated and heated sediments, with the following results:(1) The concentration of total (unbound + bound) lower molecular weight fatty acids (LFA's: C12 to C19) increased from 81µg/g dry sediment (unheated) to 95µg/g dry sediment at 198°C. The concentration of total higher molecular weight fatty acids (HFA's: C20 to C30) also increased from 36pg/g dry sediment (unheated) to 51µg/g dry sediment at 198°C. This fact suggests the presence of "tightly bound form" of FA's, i.e. FA's which can be recovered only after the thermal treatments of sediments. (2) Bound LFA's decreased rapidly on heating while unbound LFA's increased gradually. On the other hand, bound HFA's first decreased at 120°C and then increased at higher temperatures. Unbound HFA's show a similar changing pattern. The difference in the behavior on heating between bound LFA's and bound HFA's was interpreted in terms of their existence state which may be closely related with their origins.

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Section: Discussionmentioning

confidence: 99%

Experimental diagenesis of fatty acids in a sediment: Changes in their existence forms upon heating.

Kawamura

Ishiwatari

1981

Geochem. J.

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“…KOH). Details of the extraction and isolation procedures for the different compound classes have been reported previously (Brooks et al, 1976;Cardoso et al, in press;Watts et al, in press). …”

Section: Introductionmentioning

confidence: 99%

Preliminary Organic Geochemical Analyses; Site 391, Leg 44 of the Deep Sea Drilling Project

Cardoso¹,

Wardroper²,

Watts³

et al. 1978

Initial Reports of the Deep Sea Drilling Project

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“…Similarly Larson & Rockwell (1980) demonstrated significant differences between the fluorescence properties of humic substances of diverse origins and suceeded in relating them to known compounds of their humic structure. Brooks et al (1976Brooks et al ( , 1977 also showed that certain simple organic products, derived from organisms living in aquatic environments, were the source for the neosynthesis of more complicated humic substances.…”

Section: Resultsmentioning

confidence: 96%

Differentiation of some Venezuelan blackwater rivers based upon physico-chemical properties of their humic substances

Vegas-Vilarrúbia¹,

Paolini²,

Miragaya³

1988

Biogeochemistry

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Abstract. The dissolved humic substances of seven Venezuelan blackwater rivers, belonging to different tropical biogeographical regions, were analyzed. Fractionation using Sephadex gel together with an analysis of their fluorescence, absorbance and infrared spectral properties, showed differences between their humic substances. These differences were related to their biological sources and humification environment. Statistical analysis of the properties of these humic substances allowed us to separate the rivers into three groups. These groups were directly related to the geological features and vegetation of the terrestrial ecosystems into which they drain: -The Autana, Atabapo, Chola, Negro which belong to the Amazon basin on the Guayana Shield, each with typical blackwater riverine forest. -The Caroni, belonging to the Orinoco basin on the Guayana Shield and with tropical humid forest and rainforest. -The Morichal Largo which draines the Mesa Formation from the eastern Llanos and has gallery forest of MauririafZexuosa.

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Lipids of Recent sediments, Part I: Straight-chain hydrocarbons and carboxylic acids of some temperate lacustrine and sub-tropical lagoonal/tidal flat sediments

Cited by 114 publications

References 36 publications

Experimental diagenesis of fatty acids in a sediment: Changes in their existence forms upon heating.

Experimental diagenesis of fatty acids in a sediment: Changes in their existence forms upon heating.

Preliminary Organic Geochemical Analyses; Site 391, Leg 44 of the Deep Sea Drilling Project

Differentiation of some Venezuelan blackwater rivers based upon physico-chemical properties of their humic substances

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