Mercury in sediments and pore waters at a contaminated site in the Tagus estuary
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| Format: | Artículo científico |
| Langue: | en |
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Universidad Autónoma de Baja California
2003
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| _version_ | 1876473259127472128 |
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| author | Miguel Caetano |
| author_facet | Miguel Caetano |
| contents | Mercury in sediments and pore waters at a contaminated site in the Tagus estuary Miguel Caetano João Canário Carlos Vale Ciencias de la Tierra mercury sediment pore waters Tagus estuary Two sediment cores were collected at a contaminated site of the North Channel in the Tagus estuary. Sediments were sliced in1 to 2-cm vertical sections. Major and minor elements, total organic carbon, total mercury (HNO3 digest), acid volatile sulphidesAVS (1M HCl and 3M HCl) and simultaneously extractable iron, manganese and mercury were determined in the solids.Labile and total mercury (after UV irradiation) were measured in pore waters. Total mercury concentrations in the first 25 cm ofsediment were around 100 nmol g1, reflecting mainly anthropogenic discharges. A slightly compacted sediment layer (< 1 cmthickness) containing lower Hg concentrations (5 nmol g1) capped the contaminated sediment. Mercury extracted with 1M HClwas only detected in this layer where AVS are low. In the sediment column, AVS were higher (50 to 197 µmol g1), labile mercurywas detected in pore waters down to 3.5-cm depth, and total dissolved Hg showed a broad maximum at 6 cm of depth (1.1 nM).The co-existence of high AVS and high total dissolved mercury implies the presence of ligands in pore waters with high affinityto mercury, which competes with sulphides and retains the metal in solution. 2003 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48029415 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.4 Vol.29 |
| format | Artículo científico |
| id | redalyc_48029415 |
| institution | Redalyc |
| language | en |
| publishDate | 2003 |
| publisher | Universidad Autónoma de Baja California |
| spellingShingle | Mercury in sediments and pore waters at a contaminated site in the Tagus estuary Miguel Caetano Ciencias de la Tierra mercury sediment pore waters Tagus estuary Mercury in sediments and pore waters at a contaminated site in the Tagus estuary Miguel Caetano João Canário Carlos Vale Ciencias de la Tierra mercury sediment pore waters Tagus estuary Two sediment cores were collected at a contaminated site of the North Channel in the Tagus estuary. Sediments were sliced in1 to 2-cm vertical sections. Major and minor elements, total organic carbon, total mercury (HNO3 digest), acid volatile sulphidesAVS (1M HCl and 3M HCl) and simultaneously extractable iron, manganese and mercury were determined in the solids.Labile and total mercury (after UV irradiation) were measured in pore waters. Total mercury concentrations in the first 25 cm ofsediment were around 100 nmol g1, reflecting mainly anthropogenic discharges. A slightly compacted sediment layer (< 1 cmthickness) containing lower Hg concentrations (5 nmol g1) capped the contaminated sediment. Mercury extracted with 1M HClwas only detected in this layer where AVS are low. In the sediment column, AVS were higher (50 to 197 µmol g1), labile mercurywas detected in pore waters down to 3.5-cm depth, and total dissolved Hg showed a broad maximum at 6 cm of depth (1.1 nM).The co-existence of high AVS and high total dissolved mercury implies the presence of ligands in pore waters with high affinityto mercury, which competes with sulphides and retains the metal in solution. 2003 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48029415 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.4 Vol.29 |
| title | Mercury in sediments and pore waters at a contaminated site in the Tagus estuary |
| topic | Ciencias de la Tierra mercury sediment pore waters Tagus estuary |
| url | https://www.redalyc.org/articulo.oa?id=48029415 |