Dissolved Organic Matter in Freshwaters

Perdue, Edward M.; Ritchie, Jason D.

doi:10.1016/b0-08-043751-6/05080-5

Cited by 95 publications

(110 citation statements)

References 217 publications

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“…e Hedges et al (1992). f Perdue and Ritchie (2003). g Published peak areas have been normalized to 100%, if necessary.…”

Section: C Nmr Spectrometrymentioning

confidence: 99%

“…When DOM is isolated from fresh waters by XAD-8 resin or by cross-flow ultrafiltration using a 1 kDa membrane, the median yields of DOM from a large number of studies are 56% and 71%, respectively (Perdue and Ritchie, 2003). When these methods are applied to saline waters, yields vary with salinity but, in non-coastal samples, typical yields are 25% or less (Mopper et al, 2007;Perdue and Benner, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Reverse osmosis (RO) has been used for nearly 20 years to concentrate DOM from fresh waters (e.g., Serkiz and Perdue, 1990;Clair et al, 1991;Sun et al, 1995;Kitis et al, 2001). The median recovery of DOM from a large number of fresh waters by reverse osmosis is 90% (Perdue and Ritchie, 2003). The RO method concentrates not only DOM but also H 4 SiO 4 and H 2 SO 4 .…”

Section: Introductionmentioning

confidence: 99%

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Chemical and spectroscopic characterization of marine dissolved organic matter isolated using coupled reverse osmosis–electrodialysis

Koprivnjak

Pfromm

Ingall

et al. 2009

Geochimica et Cosmochimica Acta

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100

117

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The coupled reverse osmosis-electrodialysis (RO/ED) method was used to isolate dissolved organic matter (DOM) from 16 seawater samples. The average yield of organic carbon was 75 ± 12%, which is consistently greater than the yields of organic carbon that have been commonly achieved using XAD resins, C 18 adsorbents, and cross-flow ultrafiltration. UV-visible absorbance spectra and molar C/N ratios of isolated samples were consistent with the corresponding properties of DOM in the original seawater samples, indicating that DOM samples can be isolated using the coupled RO/ED method without any bias for/against these two properties. Five of the samples were desalted sufficiently that reliable measurements of their 13 C and 1 H NMR spectra and their Fourier transform ion cyclotron resonance (FTICR) mass spectra could be obtained. The 13 C and 1 H NMR spectra of RO/ED samples differed distinctly from those of samples that have been isolated in much lower yields by other methods. In particular, RO/ED samples contained a relatively lower proportion of carbohydrate carbon and a relatively greater proportion of alkyl carbon than samples that have been isolated using cross-flow ultrafiltration. From the FTICR mass spectra of RO/ED samples, samples from the open ocean contained a much lower proportion of unsaturated compounds and a much higher proportion of fatty acids than coastal samples.

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“…e Hedges et al (1992). f Perdue and Ritchie (2003). g Published peak areas have been normalized to 100%, if necessary.…”

Section: C Nmr Spectrometrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chemical and spectroscopic characterization of marine dissolved organic matter isolated using coupled reverse osmosis–electrodialysis

Koprivnjak

Pfromm

Ingall

et al. 2009

Geochimica et Cosmochimica Acta

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100

117

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“…Major components of natural organic matter in natural waters are humic substances (HS) as the refractory decomposition products of biological material (Thurman, 1985;Perdue and Ritchie, 2003). The interest in studying HS from shallow to deep aquifers has increased recently Buckau et al, 2000;Hertkorn et al, 2002;McIntyre et al, 2005;Einsiedl et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Comparative study on humic substances isolated in thermal groundwaters from deep aquifers below 700 m

et al. 2012

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“…26,27 O metal presente na fração total recuperável (TR) corresponde à concentração total presente na amostra não filtrada, enquanto o metal total dissolvido (TD) é aquele presente na fração dissolvida, operacionalmente definida como a fração que atravessa uma membrana de 0,45 µm de diâmetro de poro. 28,29 A fração lábil, presente na fração dissolvida, corresponde à soma de íons metálicos hidratados, associados a complexos fracos e adsorvidos fracamente nas partículas coloidais.…”

Section: Amostras De áGuaunclassified

Análise de especiação de cobre e zinco empregando voltametria de redissolução anódica com pulso diferencial

Tonietto¹,

Grassi²

2012

Quím. Nova

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Recebido em 10/8/10; aceito em 3/6/11; publicado na web em 22/7/11 SPECIATION ANALYSIS OF COPPER AND ZINC USING DIFFERENTIAL PULSE ANODIC STRIPPING VOLTAMMETRY. This work describes methodologies for speciation analysis of the metals copper and zinc as total, total dissolved, labile, as well as complexation capacity (conditional stability constants and available ligand concentration), using the same technique, differential pulse anodic stripping voltammetry (DPASV). Several supporting electrolytes were tested, and the results showed that KNO 3 and HNO 3 resulted in voltamograms without interferences as well as excellent resolution for the total and labile fractions. The methodology using the DPASV technique allows a simple and low cost analysis of copper and zinc speciation, with high precision and sensitivity, with limits of quantification (LOQ) of 1.8 nmol L -1 for copper and 2.1 nmol L -1 for zinc.Keywords: anodic stripping voltammetry; speciation; trace metal. INTRODUÇÃOEstudos de especiação de metais são de grande importância para a avaliação de impactos ambientais, avaliações ecotoxicológicas, assim como para o entendimento do comportamento e destino dos metais em ambientes aquáticos.1 Informações sobre a reatividade, mobilidade e biodisponibilidade dos metais em águas naturais podem ser obtidas mediante estudos de especiação. A relação entre especiação dos elementos metálicos e toxicidade aos organismos é complexa e depende não somente da espécie química em questão, mas também do organismo exposto e da função fisiológica que o elemento metálico exerce no organismo.2 Sabe-se que os elementos cobre e zinco são essenciais aos organismos aquáticos, mas podem ser tóxicos quando encontrados em concentrações mais elevadas.3 Devido à complexidade da interação metais-organismo-ambiente, o uso de técnicas analíticas capazes de determinar diferentes espécies químicas com baixa manipulação amostral, tal qual a voltametria, assume destaque quanto à compreensão da dinâmica dos metais no ambiente.Sabe-se que o papel biogeoquímico dos metais correlaciona-se com suas formas físico-químicas, as quais incluem espécies associadas ao material particulado, coloidal e dissolvido.3,4 Portanto, avaliar a concentração total de um metal é insuficiente para inferir sobre seu comportamento e destino no ambiente, assim como sobre seus impactos na biota aquática. 1,3,5 Alguns autores consideram que espécies lábeis apresentam maior biodisponibilidade aos organismos aquáticos.6 Por outro lado, metais complexados a ligantes orgânicos são considerados de menor biodisponibilidade. 7A matéria orgânica dissolvida (MOD) exerce um papel fundamental na especiação dos metais-traço; os ligantes orgânicos possuem poder de complexação com metais, 8 cuja força de associação e quantidade de ligantes disponíveis variam com a categoria da MOD.9,10 Os estudos de especiação de metais podem ser realizados empregando-se diferentes abordagens e técnicas analíticas tais como a voltametria de redissolução anódica (DPASV) e voltametria de redissolução catódica (...

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Dissolved Organic Matter in Freshwaters

Cited by 95 publications

References 217 publications

Chemical and spectroscopic characterization of marine dissolved organic matter isolated using coupled reverse osmosis–electrodialysis

Chemical and spectroscopic characterization of marine dissolved organic matter isolated using coupled reverse osmosis–electrodialysis

Comparative study on humic substances isolated in thermal groundwaters from deep aquifers below 700 m

Análise de especiação de cobre e zinco empregando voltametria de redissolução anódica com pulso diferencial

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