Mercury in sediments and pore waters at a contaminated site in the Tagus estuary
Two sediment cores were collected at a contaminated site of the North Channel in the Tagus estuary. Sediments were sliced in 1 to 2-cm vertical sections. Major and minor elements, total organic carbon, total mercury (HNO3 digest), acid volatile sulphides –AVS– (1M HCl and 3M HCl) and simultaneousl...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Universidad Autónoma de Baja California
2003-03-01
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| Series: | Ciencias Marinas |
| Subjects: | |
| Online Access: | https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/163 |
| _version_ | 1797279377192386560 |
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| author | J Canário C Vale M Caetano |
| author_facet | J Canário C Vale M Caetano |
| author_sort | J Canário |
| collection | DOAJ |
| description |
Two sediment cores were collected at a contaminated site of the North Channel in the Tagus estuary. Sediments were sliced in 1 to 2-cm vertical sections. Major and minor elements, total organic carbon, total mercury (HNO3 digest), acid volatile sulphides –AVS– (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 of sediment were around 100 nmol g–1, reflecting mainly anthropogenic discharges. A slightly compacted sediment layer (< 1 cm thickness) containing lower Hg concentrations (5 nmol g–1) capped the contaminated sediment. Mercury extracted with 1M HCl was only detected in this layer where AVS are low. In the sediment column, AVS were higher (50 to 197 µmol g–1), labile mercury was 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 affinity to mercury, which competes with sulphides and retains the metal in solution.
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| first_indexed | 2024-03-07T16:24:23Z |
| format | Article |
| id | doaj.art-36995d0711074b869b2daa28d2960e29 |
| institution | Directory Open Access Journal |
| issn | 0185-3880 2395-9053 |
| language | English |
| last_indexed | 2024-03-07T16:24:23Z |
| publishDate | 2003-03-01 |
| publisher | Universidad Autónoma de Baja California |
| record_format | Article |
| series | Ciencias Marinas |
| spelling | doaj.art-36995d0711074b869b2daa28d2960e292024-03-03T19:18:16ZengUniversidad Autónoma de Baja CaliforniaCiencias Marinas0185-38802395-90532003-03-0129410.7773/cm.v29i4.163Mercury in sediments and pore waters at a contaminated site in the Tagus estuaryJ Canário0C Vale1M Caetano2Instituto de Investigação das Pescas e do MarInstituto de Investigação das Pescas e do MarInstituto de Investigação das Pescas e do Mar Two sediment cores were collected at a contaminated site of the North Channel in the Tagus estuary. Sediments were sliced in 1 to 2-cm vertical sections. Major and minor elements, total organic carbon, total mercury (HNO3 digest), acid volatile sulphides –AVS– (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 of sediment were around 100 nmol g–1, reflecting mainly anthropogenic discharges. A slightly compacted sediment layer (< 1 cm thickness) containing lower Hg concentrations (5 nmol g–1) capped the contaminated sediment. Mercury extracted with 1M HCl was only detected in this layer where AVS are low. In the sediment column, AVS were higher (50 to 197 µmol g–1), labile mercury was 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 affinity to mercury, which competes with sulphides and retains the metal in solution. https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/163mercurysedimentpore watersTagus estuary |
| spellingShingle | J Canário C Vale M Caetano Mercury in sediments and pore waters at a contaminated site in the Tagus estuary Ciencias Marinas mercury sediment pore waters Tagus estuary |
| title | Mercury in sediments and pore waters at a contaminated site in the Tagus estuary |
| title_full | Mercury in sediments and pore waters at a contaminated site in the Tagus estuary |
| title_fullStr | Mercury in sediments and pore waters at a contaminated site in the Tagus estuary |
| title_full_unstemmed | Mercury in sediments and pore waters at a contaminated site in the Tagus estuary |
| title_short | Mercury in sediments and pore waters at a contaminated site in the Tagus estuary |
| title_sort | mercury in sediments and pore waters at a contaminated site in the tagus estuary |
| topic | mercury sediment pore waters Tagus estuary |
| url | https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/163 |
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