Organische S�uren als gel�ste Intermedi�rprodukte des postmortalen Abbaues von S��wasser-Zooplankton

Krause, Heinrich R.; Möchel, L; Stegmann, Marianne

doi:10.1007/bf00621686

Cited by 6 publications

(2 citation statements)

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“…There are essentially three sources of organic dissolved material in aquatic environments, the decomposition of plant and animal material with an estimated 15 -50% loss of total biomass by post-mortem changes in the permeability of cell membranes and the effects of autolytic enzymes (Krause et al, 1961) such as amino acids, more easily degradable, keto-acids and the most refractory material dependent on bacterial action. A second source of dissolved organic material is the release of extracellular components by living plants and animals by the excretion and secretion of products of their metabolism.…”

Section: Introductionmentioning

confidence: 99%

Dissolved organic matter (C, N, P) on the Pernambuco coast and Fernando de Noronha archipelago (Tropical Zone of Western South Atlantic, Brazil) - A contribution to the evaluation of environmental impact

2018

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The dissolved organic compounds found in seawater offer an indication of biogeochemical processes and anthropogenic influence in the light of their concentrations and behavior associated with different oceanic areas. River inputs contribute with organic loads to seawater according to the level of natural and urban influence. A dilution of this material is expected toward ocean. Around oceanic islands, the quantity of organic matter results from the life cycle of marine organisms and from human occupation. The ratios of dissolved organic carbon (DOC), dissolved organic nitrogen (DON), dissolved organic phosphorus (DOP) and the association with dissolved oxygen can be used to evaluate the environmental conditions in terms of natural and anthropogenic impacts. Available information about the essential dissolved organic compounds (C, N and P) in seawater is rare. This study seeks to encourage the use of dissolved organic compounds in environmental impact assessment in coastal areas of Brazil. , both in RH, reflects organic and sanitary discharge. Sometimes the urea concentration was associated with precarious sewage treatment combined with tourist activity, as in the case of FN. No significant spatial variation was observed for DOP taking into account all the stations and regions, and the values presented a greater range of variation in FN. The DOC:DON ratios were higher than 7 (2-4 times the Redfield ratio) and revealed the quality of the organic matter and the importance of the local process of remineralization, confirming that the N-limitation enhanced the use of organic forms, mainly on FN. The preserved oligotrophic conditions of the RIS, Itamaracá and FN were observed in relation to dissolved organic compounds (C, N, P), but, as regards FN, effective monitoring actions are advisable as it is a pristine area. , ambos em RH, refletem a descarga orgânica e de esgoto. Às vezes, a concentração de ureia esteve associada ao tratamento precário de esgoto combinado com a atividade turística, como no caso de FN. Nenhuma variação espacial significativa foi observada para DOP tendo em conta todas as estações e regiões, e os valores apresentaram maior variação de FN. Os índices DOC:DON foram superiores a 7 (2-4 vezes a relação Redfield) e revelaram a qualidade da matéria orgânica e a importância do processo local de remineralização, confirmando que a N-limitação aumentou o uso de formas orgânicas, principalmente em FN. As condições oligotróficas preservadas em RIS, Itamaracá e FN foram observadas em relação aos compostos orgânicos dissolvidos (C, N, P), mas no que diz respeito ao FN, são recomendáveis ações de monitoramento efetivas, pois é uma área remota preservada. AbstrAct resumoDescritores: Nitrogênio orgânico dissolvido, Fósforo orgânico dissolvido, Carbono orgânico total, ureia, Áreas costeiras e oceânicas.

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Section: Introductionmentioning

confidence: 99%

Dissolved organic matter (C, N, P) on the Pernambuco coast and Fernando de Noronha archipelago (Tropical Zone of Western South Atlantic, Brazil) - A contribution to the evaluation of environmental impact

2018

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“…KRAUSE, MOCHEL and STEGMANN (1961) determined amino and fatty acids which were derived from the decomposition of fresh water zooplankton under aerobic and anaerobic conditions in laboratory experiments. According to the results, acetic, propionic, butyric and valeric acids were accumulated under anaerobic decomposition processes, but only a very small amount of acetic acid appeared in the course of aerobic decomposition.…”

Section: Introductionmentioning

confidence: 99%

Extraction and Determination Methods of Organic Acids in Sea Water and Marine Sediment

Kamatani

Matsudaira

1966

Journal of the Oceanographical Society of Japan

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: It is well known that the organic compounds, particularly carbohydrates, are fermented to volatile fatty acids in significant quantities under anaerobic conditions. There were, however, up to date not so many reports on the extraction and determination methods of organic acids in sea water and marine sediments.Then, the purpose of this work was focussed to study the methods for the extraction and also for the quantitative analysis of organic acids in sea water and marine sediments.The following results were concluded from the studies.( 1 ) The volatile fatty acids were quantitatively recovered with the silica gel chromatographic method using benzene-n-butyl alcohol (20%) as an eluting solvent.( 2 ) The organic acids added in the marine sediment were 87 to 90 per cent recovered by the three or four water extractions.( 3 ) The organic acids in sea water and in the extract of sediment were quickly extracted by 4 or 8 hour extraction with the continuous ether extractor presented in this paper.The present analytical method may have the advantages of higher accuracy and less time consumption than the other methods for determining organic acids in sea water and sediments.

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Einfluß algenbürtiger organischer Substanzen auf Flockung und Filtration

Bernhardt¹,

Hoyer²,

Lüsse³

et al. 1989

Acta hydrochim. hydrobiol.

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Summary:The treatment of water from eutrophic lakes is disturbed by extensive development of plankton, which is caused by particulate algogenic organic substances and frequently also by dissolved ones. They are released by excretion, diffusion, cell destruction, separation of cell wall substances and metabolic processes in the course of the cellular reproduction in dependence on the physiological state of the algae. At a sufficient dosage of metallic salts as a flocculant, the extracellular organic substance (EOS) may act as an anionic flocculation aid in the concentration range of 1 ... 2 mg/l C. There is decisive the mass ratio: Me (metal as flocculant)/EOS (as TOC).Below a mass ratio Fe : TOC=2 ... 3 the EOS disturbs the process of flocculation and filtration. l a c k u n g s h i l f s m i t t e l z u s a t z schwach k a t i o n i s c h k a t i o n i s c hFa hr weiseO F a n ? - -t C h l o r e l l a18 Acta Iiydrocllinl., Bd. Hieraus lassen sich folgende Schliisse ableiten :-Die EOS aus der hochmolekularen Fraktion stort den Flockungs-und FlockenabtrennprozeB starker als die EOS der niedermolekulnren Fraktion. -Bei den Grun-und Blaualgen stort der hochmolekolare Anteil der EOS mit zunehmendem Kulturalter starker.-Besonders aosgeprkgt sind storende Eigenschaften der EOS der spatstationaren Wachstumsphasen der Blaualge Psewlanabaena, der G r k a l g e Dicfyosphaerium sowie der Kieselalgen Xelosira und Achnnnthes.-Von den niedermolekularen Substmzen weist nur die EOS der logarithmischen Wachstumsphase der Kieselalge Fragilaria ein ebenso stark storendes Verhalten auf.-Ein Zusammenhang des Storeffektes der EOS mit den verschiedenen Algenklassen ist nicht vorhanden. Be.stimmung der Ladunqs~onzentrationDie Restinimiiiig der Ladungsdichte von Partikeln bzw. der Ladungskonzeiitratioii einer Wasserprobe erfolgt durch Zugabe eiiies entgegengesetzt geladenen Polymers oder Polyelektrolyten bis zur Ladungsneut ralisation. Zur Bestimmung der negativen Ladungskonzentration der im Wasser gelosteii EOS wird eiii kat,ionischer PolyActs hydrochiin. hydrobiol. 17 (1989) 3 251 Tiibellr fi. EC)S-Konxeiitr;ition~ri (rng/l TOC), die r.rfnrtlerlicth sind, uni cine St.ornng d e~ Plockungsprozcsws auszulijscn, dargrst.cllt durch die Erhohung der Kcsttriibung im Filt.rat (von en. 0,25 m-l n i i f 0.5 in -1 ) (Versurlie mit. der ,.kleinen" Flocb-nngstestapparstur) (1989) s t a t i o n a r e PhaseAbh. 9. Abhangigkeit des Zusntzes a n Pe-LII-

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Organische S�uren als gel�ste Intermedi�rprodukte des postmortalen Abbaues von S��wasser-Zooplankton

Cited by 6 publications

References 4 publications

Dissolved organic matter (C, N, P) on the Pernambuco coast and Fernando de Noronha archipelago (Tropical Zone of Western South Atlantic, Brazil) - A contribution to the evaluation of environmental impact

Dissolved organic matter (C, N, P) on the Pernambuco coast and Fernando de Noronha archipelago (Tropical Zone of Western South Atlantic, Brazil) - A contribution to the evaluation of environmental impact

Extraction and Determination Methods of Organic Acids in Sea Water and Marine Sediment

Einfluß algenbürtiger organischer Substanzen auf Flockung und Filtration

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