Molecular mass distributions of dissolved organic carbon and associated metals in waters from Rio Negro and Rio Solimões
Waters from two tributaries of the Amazon River, the Rio Negro and Rio Solimões, were collected near Manaus (Brazil), and their dissolved organic carbon (DOC) were concentrated and size fractionated by ultrafiltration. Hollow fiber ultrafiltration columns were used to separate humic compounds (and a...
| Autor principal: | Küchler, Ivo Lewin |
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| Outros Autores: | Miekeley, Norbert F., Forsberg, Bruce Rider |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
Science of the Total Environment
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/19461 |
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oai:repositorio:1-19461 |
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oai:repositorio:1-19461 Molecular mass distributions of dissolved organic carbon and associated metals in waters from Rio Negro and Rio Solimões Küchler, Ivo Lewin Miekeley, Norbert F. Forsberg, Bruce Rider Carbon Dissolved Organic Metals Rivers Ultrafiltration Dissolved Organic Carbon Humic Compound Metal Ion River Water Quality Brazil, Rio Negro Brazil, Rio Solimoes Metal Organic Compound River Water Brasil Priority Journal Ultrafiltration Water Analysis Water Pollution Water Quality Waters from two tributaries of the Amazon River, the Rio Negro and Rio Solimões, were collected near Manaus (Brazil), and their dissolved organic carbon (DOC) were concentrated and size fractionated by ultrafiltration. Hollow fiber ultrafiltration columns were used to separate humic compounds (and associated metal ions) from larger volumes of water in the field. The metal composition of each fraction was determined primarily by ICP-AES, after preconcentration. Flat membrane ultrafiltration was used to obtain sharper molecular mass cut-off levels in the laboratory. About 30-40% of the DOC in the Rio Negro water was within the mass range of 1-10 kDa. This fraction was composed mainly of humic compounds, which are the carriers for most of the metal ions studied (e.g. Al, Fe, Ti, Cu, Mn, Zn, Ca, Mg). Humic and fulvic acids, isolated from these waters, were characterized by IR-spectrometry and potentiometric titrations. Water from the Rio Solimões showed lower retention of DOC (≊ 20%) and associated metal ions, probably due to the more pronounced sorption of the high-molecular mass humic compounds on suspended particles. Despite the high load of clay particles in this water, no evidence of such particles in colloidal size ranges was observed. © 1994. 2020-06-15T22:08:52Z 2020-06-15T22:08:52Z 1994 Artigo https://repositorio.inpa.gov.br/handle/1/19461 10.1016/0048-9697(94)90188-0 en Volume 156, Número 3, Pags. 207-216 Restrito Science of the Total Environment |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Carbon Dissolved Organic Metals Rivers Ultrafiltration Dissolved Organic Carbon Humic Compound Metal Ion River Water Quality Brazil, Rio Negro Brazil, Rio Solimoes Metal Organic Compound River Water Brasil Priority Journal Ultrafiltration Water Analysis Water Pollution Water Quality |
| spellingShingle |
Carbon Dissolved Organic Metals Rivers Ultrafiltration Dissolved Organic Carbon Humic Compound Metal Ion River Water Quality Brazil, Rio Negro Brazil, Rio Solimoes Metal Organic Compound River Water Brasil Priority Journal Ultrafiltration Water Analysis Water Pollution Water Quality Küchler, Ivo Lewin Molecular mass distributions of dissolved organic carbon and associated metals in waters from Rio Negro and Rio Solimões |
| topic_facet |
Carbon Dissolved Organic Metals Rivers Ultrafiltration Dissolved Organic Carbon Humic Compound Metal Ion River Water Quality Brazil, Rio Negro Brazil, Rio Solimoes Metal Organic Compound River Water Brasil Priority Journal Ultrafiltration Water Analysis Water Pollution Water Quality |
| description |
Waters from two tributaries of the Amazon River, the Rio Negro and Rio Solimões, were collected near Manaus (Brazil), and their dissolved organic carbon (DOC) were concentrated and size fractionated by ultrafiltration. Hollow fiber ultrafiltration columns were used to separate humic compounds (and associated metal ions) from larger volumes of water in the field. The metal composition of each fraction was determined primarily by ICP-AES, after preconcentration. Flat membrane ultrafiltration was used to obtain sharper molecular mass cut-off levels in the laboratory. About 30-40% of the DOC in the Rio Negro water was within the mass range of 1-10 kDa. This fraction was composed mainly of humic compounds, which are the carriers for most of the metal ions studied (e.g. Al, Fe, Ti, Cu, Mn, Zn, Ca, Mg). Humic and fulvic acids, isolated from these waters, were characterized by IR-spectrometry and potentiometric titrations. Water from the Rio Solimões showed lower retention of DOC (≊ 20%) and associated metal ions, probably due to the more pronounced sorption of the high-molecular mass humic compounds on suspended particles. Despite the high load of clay particles in this water, no evidence of such particles in colloidal size ranges was observed. © 1994. |
| format |
Artigo |
| author |
Küchler, Ivo Lewin |
| author2 |
Miekeley, Norbert F. Forsberg, Bruce Rider |
| author2Str |
Miekeley, Norbert F. Forsberg, Bruce Rider |
| title |
Molecular mass distributions of dissolved organic carbon and associated metals in waters from Rio Negro and Rio Solimões |
| title_short |
Molecular mass distributions of dissolved organic carbon and associated metals in waters from Rio Negro and Rio Solimões |
| title_full |
Molecular mass distributions of dissolved organic carbon and associated metals in waters from Rio Negro and Rio Solimões |
| title_fullStr |
Molecular mass distributions of dissolved organic carbon and associated metals in waters from Rio Negro and Rio Solimões |
| title_full_unstemmed |
Molecular mass distributions of dissolved organic carbon and associated metals in waters from Rio Negro and Rio Solimões |
| title_sort |
molecular mass distributions of dissolved organic carbon and associated metals in waters from rio negro and rio solimões |
| publisher |
Science of the Total Environment |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/19461 |
| _version_ |
1787143943199129600 |
| score |
11.755432 |