Dissolved and particulate humic substances in water channels in the historic centre of Venice

Calace, N.; Palmieri, N.; Mirante, Sabrina; Petronio, B.M.; Pietroletti, Marco

doi:10.1016/j.watres.2005.09.049

Cited by 13 publications

(4 citation statements)

References 20 publications

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“…Currently, the screen [11], the rotating drum [12], the glass plate [13], and Teflon plate methods are the most widely used [4]. The Multi-Use Microlayer Sampler (MUMS) [5][6][7][14][15][16] was used to collect SML and SSW samples simultaneously. This device consists of a radio controlled floating structure which can collect SML and SSW at the same time.…”

Section: Sea Surface Microlayer Samplingmentioning

confidence: 99%

n-Alkanes, PAHs and surfactants in the sea surface microlayer and sea water samples of the Gerlache Inlet sea (Antarctica)

Stortini

Martellini

Bubba

et al. 2009

Microchemical Journal

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a b s t r a c t a r t i c l e i n f oSea surface microlayer (SML) and sea water samples (SSW) collected in the Gerlache Inlet Sea (Antarctica) were analysed for n-alkanes and polycyclic aromatic hydrocarbons (PAHs). The SML is a potential enrichment site of hydrophobic organic compounds compared to the underlying water column. Total concentration ranges of n-alkanes and PAHs (dissolved and particulate) in subsurface water (− 0.5 m depth) were 272-553 ng l − 1 (mean: 448 ng l − 1 ) and 5.27-9.43 ng l − 1 (mean: 7.06 ng l − 1 ), respectively. In the SML, the concentration ranges of n-alkanes and PAHs were 353-968 ng l − 1 (mean: 611 ng l − 1 ) and 7.32-23.94 ng l − 1 (mean: 13.22 ng l − 1 ), respectively. To evaluate possible PAH contamination sources, specific PAH ratios were calculated. The ratios reflected a predominant petrogenic input. A characterisation of surface active substances was also performed on SML and SSW samples, both by gas bubble extraction, and by dynamic surface tension measurements. Results showed a good correlation between n-alkanes, PAHs and refractory organic matter.

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Section: Sea Surface Microlayer Samplingmentioning

confidence: 99%

n-Alkanes, PAHs and surfactants in the sea surface microlayer and sea water samples of the Gerlache Inlet sea (Antarctica)

Stortini

Martellini

Bubba

et al. 2009

Microchemical Journal

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“…To date, the analysis of HS in natural waters has been carried out mainly in the dissolved phase and only a restricted number of studies have focused on the particulate phase. Calace, et al (2006) investigated particulate HS (pHS) in the Venice canals and in the Ross Sea (2010). These authors determined pHS concentrations as the difference between unfiltered and filtered samples and the extraction used to recover pHS was long, arduous and may not be the most appropriate technique for large-scale studies.…”

Section: Introductionmentioning

confidence: 99%

Distribution, speciation and composition of humic substances in a macro-tidal temperate estuary

Riso

Mastin

Aschehoug

et al. 2021

Estuarine, Coastal and Shelf Science

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In aquatic environments, the term humic substances (HS) encompasses terrestrial and autochthonous refractory organic matter. HS are one of the main fractions of natural organic matter and are important chelators of trace elements. In environmental studies, the determination of HS is often restricted to the dissolved fraction, and the content of HS in the suspended particles remains unknown. In this work, we present the composition and dynamics of HS along the mixing gradient of a macrotidal estuary in both the dissolved and particulate fraction. After the isolation of particulate HS using a solid-liquid alkali extraction method, HS were characterized by size exclusion chromatography (SEC) and electrochemical methods. The method, validated using a certified reference material, demonstrated a low detection limit (μg-C L−1), a good repeatability (7.7%) an excellent reproducibility (1.3%) and was poorly prone to contamination (filter blank < 1 μg-C). Analyses of environmental samples showed a particulate fraction contributing significantly to the total humic pool in the estuary (3-20%) and representing up to 35% of electroactive HS. Phase transfers from the dissolved to the particulate fraction were observed and the electroactive HS were strongly affected in the maximum turbidity zone. Multi-detection SEC analyses showed differences in the molecular composition between the dissolved and particulate fractions. Particulate HS were more nitrogen-rich and electroactive than dissolved HS. The non-conservative changes in the composition of HS along the land-sea continuum evidence the existence of abiotic and biotic processes that altered HS during their transit from river to marine waters.Please note that this is an author-produced PDF of an article accepted for publication following peer review. The definitive publisher-authenticated version is available on the publisher Web site.

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“…Esse aumento na estabilidade térmica de parte das SHA deve-se aos complexos SHA-M formados, pois a formação deles pode estar relacionada à reorganização das frações das SHA após a quebra das ligações intermoleculares provocadas pelas espécies metálicas (Santos et al, 2018 et al (2006). Finalmente, para o último evento térmico, é possível observar que o valor da T máx para as SHA da Serra de Itabaiana (T máx = 800 ºC) foi muito superior aos valores reportados por Esteves e Duarte (1999), e Calace et al (2006). Contudo, é importante mencionar que essas diferenças de estabilidade térmica estão diretamente in uenciadas pelas diferentes origens das SHA, bem como pelo grau de humi cação das mesmas.…”

Section: Análise Termogravimétrica (Tga) Das Substâncias Húmicas Aquáunclassified

Extração E Caracterização De Substâncias Húmicas Aquáticas (Sha) Extraídas De Amostras Coletadas No Parque Nacional Serra De Itabaiana, Sergipe, Brasil

Costa

Santos

et al. 2018

R. Ci. Amb.

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Este trabalho descreve o estudo da capacidade de complexação (CC) das substâncias húmicas aquáticas (SHA) extraídas de amostras de água coletadas no Parque Nacional Serra de Itabaiana (Sergipe) pelos íons metálicos Mn, Ni, Zn, Cu e Pb, bem como a avaliação da concentração dos metais totais das amostras de água. Os parâmetros físicos e químicos das amostras de água foram determinados por pH, temperatura, condutividade elétrica e COD, assim como a determinação dos metais totais foram quantificados por ICP OES. As SHA foram extraídas com resina XAD 8, segundo o procedimento reconhecido pela International Humic Substances Society (IHSS), e foram caracterizadas por TGA, análise elementar e por FTIR. Posteriormente foi estudado a CC das SHA pelos íons metálicos Cu, Mn, Ni, Pb e Zn pelo método de ultrafiltração. O valor do pH da amostra estudada apresentou valor abaixo dos estabelecidos pela Resolução CONAMA N° 357. No entanto, o valor da condutividade elétrica está em conformidade com a Portaria N° 2914 do Ministério da Saúde. As concentrações dos metais totais estão em acordo com a Resolução CONAMA N° 357, exceto para o Pb. As SHA apresentaram três processos principais de perda de massa (de acordo com as curvas TGA/DTGA), e o espectro FTIR apresentou bandas características de SHA. A CC das SHA por íons metálicos estabeleceu a seguinte ordem decrescente: Mn(II) > Ni(II) > Zn(II) >> Cu(II) > Pb(II). Esses resultados reforçam que as SHA podem ser classificadas como agentes complexantes naturais que desempenham uma função importante no meio ambiente.

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Dissolved and particulate humic substances in water channels in the historic centre of Venice

Cited by 13 publications

References 20 publications

n-Alkanes, PAHs and surfactants in the sea surface microlayer and sea water samples of the Gerlache Inlet sea (Antarctica)

n-Alkanes, PAHs and surfactants in the sea surface microlayer and sea water samples of the Gerlache Inlet sea (Antarctica)

Distribution, speciation and composition of humic substances in a macro-tidal temperate estuary

Extração E Caracterização De Substâncias Húmicas Aquáticas (Sha) Extraídas De Amostras Coletadas No Parque Nacional Serra De Itabaiana, Sergipe, Brasil

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