IRON AND MANGANESE REDUCTION IN POREWATERS OF THE BAY OF CONCEPCION AND ADJACENT CONTINENTAL SHELF DURING THE "1997-98 EL NIÑO" EVENT
Porewater chemistry gives some indication as to specific diagenetic reactions occurring in sediments. Reduction of manganese and iron oxides can occur due to abiotic reactions with sulfide or microbially mediated as electron acceptors in the degradation of organic matter. Sedimentary porewaters obta...
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Sociedad Chilena de Química
2003
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oai:scielo:S0717-970720030003000062004-01-30IRON AND MANGANESE REDUCTION IN POREWATERS OF THE BAY OF CONCEPCION AND ADJACENT CONTINENTAL SHELF DURING THE "1997-98 EL NIÑO" EVENTPINTO A.,LUISRIVERA C.,CECILIA reduced iron reduced manganese coastal sediments porewater, early diagenesis El Niño event Porewater chemistry gives some indication as to specific diagenetic reactions occurring in sediments. Reduction of manganese and iron oxides can occur due to abiotic reactions with sulfide or microbially mediated as electron acceptors in the degradation of organic matter. Sedimentary porewaters obtained from the Bay of Concepcion (36°38'S; 73°02'W) and continental shelf (36°31'S; 73°08'W) were analised to determine the distribution of remobilised Fe2+ and Mn2+. Sampling of the area coincided with the presence of the strong "1997-98 El Niño event". Porewaters were extracted under a nitrogen atmosphere and analised by atomic absorption spectrometry. Subsurface maxima are observed for Fe2+ during "El Niño event" in the bay and adjacent continental shelf (86.8 ± 9.3 µM y 59.3 ± 35.5 µM, respectively). A year later when the oxygen minimum is present, the production of Fe2+ on bay surface sediments increases 3-fold. Maxima concentrations for Mn2+ appear on surface sediments during and after "El Niño event" within the bay. It is postulated that vertical displacement of maxima concentrations observed for Fe2+ and Mn2+ in these sediments are modulated by changes of the oxygen minimum depth in the water column and the amount and quality of organic matter deposited in surface sedimentsinfo:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.48 n.3 20032003-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072003000300006en10.4067/S0717-97072003000300006 |
| institution |
Scielo Chile |
| collection |
Scielo Chile |
| language |
English |
| topic |
reduced iron reduced manganese coastal sediments porewater, early diagenesis El Niño event |
| spellingShingle |
reduced iron reduced manganese coastal sediments porewater, early diagenesis El Niño event PINTO A.,LUIS RIVERA C.,CECILIA IRON AND MANGANESE REDUCTION IN POREWATERS OF THE BAY OF CONCEPCION AND ADJACENT CONTINENTAL SHELF DURING THE "1997-98 EL NIÑO" EVENT |
| description |
Porewater chemistry gives some indication as to specific diagenetic reactions occurring in sediments. Reduction of manganese and iron oxides can occur due to abiotic reactions with sulfide or microbially mediated as electron acceptors in the degradation of organic matter. Sedimentary porewaters obtained from the Bay of Concepcion (36°38'S; 73°02'W) and continental shelf (36°31'S; 73°08'W) were analised to determine the distribution of remobilised Fe2+ and Mn2+. Sampling of the area coincided with the presence of the strong "1997-98 El Niño event". Porewaters were extracted under a nitrogen atmosphere and analised by atomic absorption spectrometry. Subsurface maxima are observed for Fe2+ during "El Niño event" in the bay and adjacent continental shelf (86.8 ± 9.3 µM y 59.3 ± 35.5 µM, respectively). A year later when the oxygen minimum is present, the production of Fe2+ on bay surface sediments increases 3-fold. Maxima concentrations for Mn2+ appear on surface sediments during and after "El Niño event" within the bay. It is postulated that vertical displacement of maxima concentrations observed for Fe2+ and Mn2+ in these sediments are modulated by changes of the oxygen minimum depth in the water column and the amount and quality of organic matter deposited in surface sediments |
| author |
PINTO A.,LUIS RIVERA C.,CECILIA |
| author_facet |
PINTO A.,LUIS RIVERA C.,CECILIA |
| author_sort |
PINTO A.,LUIS |
| title |
IRON AND MANGANESE REDUCTION IN POREWATERS OF THE BAY OF CONCEPCION AND ADJACENT CONTINENTAL SHELF DURING THE "1997-98 EL NIÑO" EVENT |
| title_short |
IRON AND MANGANESE REDUCTION IN POREWATERS OF THE BAY OF CONCEPCION AND ADJACENT CONTINENTAL SHELF DURING THE "1997-98 EL NIÑO" EVENT |
| title_full |
IRON AND MANGANESE REDUCTION IN POREWATERS OF THE BAY OF CONCEPCION AND ADJACENT CONTINENTAL SHELF DURING THE "1997-98 EL NIÑO" EVENT |
| title_fullStr |
IRON AND MANGANESE REDUCTION IN POREWATERS OF THE BAY OF CONCEPCION AND ADJACENT CONTINENTAL SHELF DURING THE "1997-98 EL NIÑO" EVENT |
| title_full_unstemmed |
IRON AND MANGANESE REDUCTION IN POREWATERS OF THE BAY OF CONCEPCION AND ADJACENT CONTINENTAL SHELF DURING THE "1997-98 EL NIÑO" EVENT |
| title_sort |
iron and manganese reduction in porewaters of the bay of concepcion and adjacent continental shelf during the "1997-98 el niño" event |
| publisher |
Sociedad Chilena de Química |
| publishDate |
2003 |
| url |
http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072003000300006 |
| work_keys_str_mv |
AT pintoaluis ironandmanganesereductioninporewatersofthebayofconcepcionandadjacentcontinentalshelfduringthe199798elninoevent AT riveraccecilia ironandmanganesereductioninporewatersofthebayofconcepcionandadjacentcontinentalshelfduringthe199798elninoevent |
| _version_ |
1718445327165423616 |