/* DATA DESCRIPTION: Citation: Akita, Lailah Gifty; Popoola, Samuel Olatunde; Yao, Marcel Konan; Akpetou, Lazare Kouame; Yao, N'goran‪ Jean-Paul; Edmond, Sossoukpe; Sossou, Ehoumi Paul; Nkwoji, Joseph; Botwe, Benjamin Osei; Agyekumhene, Andrews; Nunoo, Francis Kofi Ewusie; Nyarko, Elvis; Gnakabi, Edgar Michael; Biney, Charles; Akoetey, Charlotte Mawoussi Yawa; Gnimassoun, Jean Baptiste Gbêssi; Ayoola, Nubi Olubunmi; Laudien, Jürgen; Asamoah, Eunice Konadu; Emeka, Chimezie; Seeyave, Sophie (2026): Spatial Variability of Total Mercury and Methyl Mercury Concentrations in Coastal Sediments from Five African Countries in the Gulf of Guinea Region [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.996125 Abstract: Anthropogenic activities, such as untreated sewage disposal and mining, contribute to metal pollution in coastal marine environments. Toxic metals (e.g., mercury) are detrimental, even in small amounts,tal and can be transferred through the aquatic food chain via bioaccumulation and biomagnification. Mercury is a naturally abundant element and a potentially toxic industrial metal, mostly released into the environment via drinking water, dietary intake, and industrial activities (Charkiewicz et al., 2025; Genchi et al., 2017; Li et al., 2024). Therefore, there is a need to investigate the status of mercury contamination in the coastal marine environment. Mercury occurs in different forms, including inorganic elemental mercury, monovalent mercury, divalent mercury, and organic forms such as methylmercury (MeHg)(Tian et al., 2023). There are mainly three forms: elemental mercury (Hg0), inorganic mercury (IHg: Hg+ and Hg2+), and organic mercury(methyl—MeHg; ethyl—EtHg; and phenyl—PhHg), with the MeHg form being the most dangerous and harmful to human health or even life (Genchi et al., 2017; Hu et al., 2021)'. The study assessed spatial distribution of total mercury (THg) and methyl mercury (meHg) in coastal sediments from five African countries covering five coastal water bodies, mainly, Ebrié Lagoon (E.L., Côte d'Ivoire), Volta Estuary (V.E., Ghana), Lake Togo (L.T., Togo), Lake Nokoué (L.N., Benin), and Lagos Lagoon (L.L., Nigeria) within the Gulf of Guinea region to understand the spatial dynamics and transboundary mercury pollution for protection of life below water (SDG14), promote good health and well-being (SDG3), promote clean water and sanitation (SDG6), and building partnerships to advocate for reforms in mercury pollution policies in the sub Saharan Africa region. Sediment is a source of environmental contamination and a permanent component of aquatic ecosystems. Forty-eight surficial coastal sediment samples (0–10 cm) were collected from the five selected coastal systems based on their ecological significance and human impacts in the dry season (November 2022, February, and March 2023) using bottom sampling gear ( Eckman and Van Veen grabs) based on the depth of the waterbodies. Wet coastal sediment (the uppermost oxidised portion, 0 –2 cm) was air-dried immediately after collection for preservation. Before the analytical procedures, all sediments were oven-dried at 60°C and sieved to obtain particle-size fractions. The Direct Mercury Analyser (Model DMA-80, Milestone) was used to determine total mercury (THg) and methyl mercury (MeHg) in the <63 μm size fraction of sediment according to the standard methods (e.,g US-EPA 1998). The analyses were carried out at the Department of Marine and Fisheries Sciences at the University of Ghana. The use of thermal release to obtain mercury speciation information has been used for a long time (Valsecchi et al., 2021). The DMA uses thermal energy and atomic absorption spectrometry Valsecchi et al., 2021). The direct mercury analyser (DMA) enabled i) no sample digestion; ii) quantitative analysis, including the detection of total mercury (THg) and methyl mercury (meHg) at mg kg⁻¹ levels; and iii) the analysis of very small sample quantities, allowing a greater variety of studies on the redoxx transformations of the metal in environmental matrices (Barst et al., 2013; Charkiewicz et al., 2025; Li et al., 2024; Valsecchi et al., 2021; Windmöller et al., 2017). Keyword(s): aquatic ecosystems health; Ecological risk assessment; Gulf of Guinea; mercury contaiminated sediment; Methylmercury determination; total mercury analysis Related to: Akita, Lailah Gifty; et al. (submitted): Spatial Distribution, Contamination Levels, and Ecological Risk of Total Mercury and Methyl Mercury in the Gulf of Guinea Sediments. Water Air and Soil Pollution Barst, Benjamin D; Hammerschmidt, Chad R; Chumchal, Matthew M; Muir, Derek C G; Smith, JD; Roberts, Aaron P; Rainwater, Thomas R; Drevnick, Paul E (2013): Determination of mercury speciation in fish tissue with a direct mercury analyzer. Environmental Toxicology and Chemistry, 32(6), 1237-1241, https://doi.org/10.1002/etc.2184 Charkiewicz, Angelika Edyta; Omeljaniuk, Wioleta Justyna; Garley, Marzena; Nikliński, Jacek (2025): Mercury Exposure and Health Effects: What Do We Really Know? International Journal of Molecular Sciences, 26(5), 2326, https://doi.org/10.3390/ijms26052326 Genchi, Giuseppe; Sinicropi, Maria; Carocci, Alessia; Lauria, Graziantonio; Catalano, Alessia (2017): Mercury Exposure and Heart Diseases. International Journal of Environmental Research and Public Health, 14(1), 74, https://doi.org/10.3390/ijerph14010074 Hu, Xue Feng; Lowe, Mackenzie; Chan, Hing Man (2021): Mercury exposure, cardiovascular disease, and mortality: A systematic review and dose-response meta-analysis. Environmental Research, 193, 110538, https://doi.org/10.1016/j.envres.2020.110538 Li, Kai; Sun, Ranhao; Guo, Guanghui (2024): Spatial and temporal variations in environmental impacts of heavy metal emissions from China's non-ferrous industry: An enterprise-specific assessment. Science of the Total Environment, 929, 172770, https://doi.org/10.1016/j.scitotenv.2024.172770 Tian, Xue; Lin, Xiaoying; Zhao, Jiating; Cui, Liwei; Gao, Yuxi; Yu, Yong-Liang; Li, Bai; Li, Yu-Feng (2023): Gut as the target tissue of mercury and the extraintestinal effects. Toxicology, 484, 153396, https://doi.org/10.1016/j.tox.2022.153396 United States Environmental Protection Agency (1998): Method 7473 (SW-846): Mercury in Solids and Solutions by Thermal Decomposition, Amalgamation, and Atomic Absorption Spectrophotometry, Revision 0. Washington, DC Valsecchi, Lucia; Roscioli, Claudio; Schiavon, Alfredo; Marziali, Laura (2021): Methylmercury determination in freshwater biota and sediments: Static headspace GC-MS compared to direct mercury analyzer. MethodsX, 8, 101581, https://doi.org/10.1016/j.mex.2021.101581 Windmöller, Cláudia Carvalhinho; Silva, Nayara Carolinne; Morais Andrade, Pedro Henrique; Mendes, Louise Aparecida; Magalhães do Valle, Cláudia (2017): Use of a direct mercury analyzer® for mercury speciation in different matrices without sample preparation. Analytical Methods, 9(14), 2159-2167, https://doi.org/10.1039/C6AY03041F Coverage: MEDIAN LATITUDE: 5.954451 * MEDIAN LONGITUDE: 0.329652 * SOUTH-BOUND LATITUDE: 5.258056 * WEST-BOUND LONGITUDE: -4.306111 * NORTH-BOUND LATITUDE: 6.602000 * EAST-BOUND LONGITUDE: 3.578000 DATE/TIME START: 2022-11-18T00:00:00 * DATE/TIME END: 2023-03-28T00:00:00 Event(s): Ebrié_Lagoon * LATITUDE: 5.272778 * LONGITUDE: -4.240556 * DATE/TIME: 2022-11-18T00:00:00 * LOCATION: Ivory Coast Lagos_Lagoon * LATITUDE: 6.525000 * LONGITUDE: 3.401000 * DATE/TIME: 2023-01-15T00:00:00 * LOCATION: Nigeria Lake_Nokoué * LATITUDE: 6.369160 * LONGITUDE: 2.386660 * DATE/TIME: 2023-03-22T00:00:00 * LOCATION: Benin Lake_Togo * LATITUDE: 6.230256 * LONGITUDE: 1.514903 * DATE/TIME: 2023-03-10T00:00:00 * LOCATION: Togo Volta_Estuary * LATITUDE: 5.774694 * LONGITUDE: 0.662111 * DATE/TIME: 2023-03-28T00:00:00 * LOCATION: Volta River estuary, Ghana, Africa Parameter(s): Event label (Event) * PI: Akita, Lailah Gifty (https://orcid.org/0000-0002-1074-296X, lailah.lailah@gmail.com) Sample code/label (Sample label) * PI: Akita, Lailah Gifty (https://orcid.org/0000-0002-1074-296X, lailah.lailah@gmail.com) Water Body (Water Body) * PI: Akita, Lailah Gifty (https://orcid.org/0000-0002-1074-296X, lailah.lailah@gmail.com) Name (Name) * PI: Akita, Lailah Gifty (https://orcid.org/0000-0002-1074-296X, lailah.lailah@gmail.com) Description (Description) * PI: Akita, Lailah Gifty (https://orcid.org/0000-0002-1074-296X, lailah.lailah@gmail.com) Location (Location) * PI: Akita, Lailah Gifty (https://orcid.org/0000-0002-1074-296X, lailah.lailah@gmail.com) LONGITUDE (Longitude) * GEOCODE * PI: Akita, Lailah Gifty (https://orcid.org/0000-0002-1074-296X, lailah.lailah@gmail.com) LATITUDE (Latitude) * GEOCODE * PI: Akita, Lailah Gifty (https://orcid.org/0000-0002-1074-296X, lailah.lailah@gmail.com) Sample method (Sample method) * PI: Akita, Lailah Gifty (https://orcid.org/0000-0002-1074-296X, lailah.lailah@gmail.com) Plate (Plate) * PI: Akita, Lailah Gifty (https://orcid.org/0000-0002-1074-296X, lailah.lailah@gmail.com) * COMMENT: number Sample, dry mass [g] (Samp dm) * PI: Akita, Lailah Gifty (https://orcid.org/0000-0002-1074-296X, lailah.lailah@gmail.com) Mercury [mg/kg] (Hg) * PI: Akita, Lailah Gifty (https://orcid.org/0000-0002-1074-296X, lailah.lailah@gmail.com) Methylmercury [µg/kg] (MeHG) * PI: Akita, Lailah Gifty (https://orcid.org/0000-0002-1074-296X, lailah.lailah@gmail.com) * COMMENT: no value = below detection limit Image (IMAGE) * PI: Akita, Lailah Gifty (https://orcid.org/0000-0002-1074-296X, lailah.lailah@gmail.com) * COMMENT: map of sampling stations License: Creative Commons Attribution 4.0 International (CC-BY-4.0) (URI: https://creativecommons.org/licenses/by/4.0/) Status: Curation Level: Enhanced curation (URI: https://wiki.pangaea.de/wiki/Curation_levels) Size: 426 data points Files: All files referred to in data matrix can be downloaded in one go as ZIP or TAR (PANGAEA user account required). To download single files, use the filename from data matrix appended to "https://download.pangaea.de/dataset/996125/files/". */ Event Sample label Water Body Name Description Location Longitude Latitude Sample method Plate Samp dm [g] Hg [mg/kg] MeHG [µg/kg] IMAGE Ebrié_Lagoon S1 63 Lagoon Ebrie Lagoon Aprés point Jacqueville -4.240556 5.272778 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 1 0.2 0.0643 0.0173 Map_ Ebrie _Lagoon_Cote d'Ivoire _1.png Ebrié_Lagoon S2 63 Lagoon Ebrie Lagoon Aprés point Jacqueville -4.241389 5.281389 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 2 0.2 0.1643 Ebrié_Lagoon S4 63 Lagoon Ebrie Lagoon Aprés point Jacqueville -4.249722 5.291111 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 3 0.2 0.1734 Ebrié_Lagoon S5 63 Lagoon Ebrie Lagoon Aprés point Jacqueville -4.251111 5.281944 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 4 0.2 0.3624 0.0074 Ebrié_Lagoon S6 63 Lagoon Ebrie Lagoon Aprés point Jacqueville -4.251667 5.272778 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 5 0.2 0.2920 0.0133 Ebrié_Lagoon S11 63 Lagoon Ebrie Lagoon Aprés point Jacqueville -4.253889 5.307222 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 6 0.2 0.2721 0.0084 Ebrié_Lagoon S12 63 Lagoon Ebrie Lagoon Aprés point Jacqueville -4.263333 5.286944 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 7 0.2 0.2543 Ebrié_Lagoon S16 63 Lagoon Ebrie Lagoon Aprés point Jacqueville -4.290000 5.286944 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 8 0.2 1.1452 Ebrié_Lagoon S17 63 Lagoon Ebrie Lagoon Aprés point Jacqueville -4.306111 5.258056 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 9 0.2 1.8845 Ebrié_Lagoon P10 63 Lagoon Ebrie Lagoon Aprés point Jacqueville -4.212500 5.313056 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 10 0.2 0.0567 Ebrié_Lagoon P11 63 Lagoon Ebrie Lagoon Aprés point Jacqueville -4.206966 5.313066 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 11 0.2 0.0827 0.0129 Ebrié_Lagoon P12 63 Lagoon Ebrie Lagoon Aprés point Jacqueville -4.206966 5.312500 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 12 0.2 0.1713 Ebrié_Lagoon P15 63 Lagoon Ebrie Lagoon Aprés point Jacqueville -4.173611 5.306667 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 13 0.2 0.0299 0.0107 Ebrié_Lagoon P16 63 Lagoon Ebrie Lagoon Aprés point Jacqueville -4.171111 5.296667 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 14 0.2 0.7809 Volta_Estuary S1R1 Estuary Volta Estuary 0.662111 5.774694 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 1 0.2 0.0100 0.0574 Map_Volta_Estuary_ Ghana_2.png Volta_Estuary S1R2 Estuary Volta Estuary 0.662583 5.776806 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 2 0.2 0.0950 0.0007 Volta_Estuary S1R3 Estuary Volta Estuary 0.662500 5.776861 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 3 0.2 0.1400 Volta_Estuary S2R1 Estuary Volta Estuary 0.655278 5.786639 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 4 0.2 0.0800 Volta_Estuary S2R2 Estuary Volta Estuary 0.662583 5.776806 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 5 0.2 0.0620 Volta_Estuary S2R3 Estuary Volta Estuary 0.660722 5.774694 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 6 0.2 0.0720 Volta_Estuary S3R1 Estuary Volta Estuary 0.645361 5.785389 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 7 0.2 0.0880 0.0012 Volta_Estuary S3R2 Estuary Volta Estuary 0.644444 5.783694 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 8 0.2 0.0280 Volta_Estuary S3R3 Estuary Volta Estuary 0.644444 5.817028 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 9 0.2 0.1000 Volta_Estuary S4R1 Estuary Volta Estuary 0.635472 5.788944 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 10 0.2 0.0160 Volta_Estuary S4R2 Estuary Volta Estuary 0.634444 5.790556 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana Volta_Estuary S4R3 Estuary Volta Estuary 0.652417 5.788889 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 11 0.2 0.0500 Volta_Estuary S5R1 Estuary Volta Estuary 0.631917 5.788944 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 12 0.2 0.0130 0.0012 Volta_Estuary S5R2 Estuary Volta Estuary 0.630556 5.788944 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 13 0.2 0.0520 Volta_Estuary S5R3 Estuary Volta Estuary 0.632778 5.789083 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana Lake_Nokoué st1 Benin Lagoon Homel Lagoon Effluent discharge point of the Mother and Child Hospital (CHU- MEL) 2.386660 6.369160 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 1 0.2 0.0957 Map_ Lake Nokoue_ Benin_4.png Lake_Nokoué st 2 Benin Lagoon Datokokpa Lagoon Solid waste discharge area near the lagoon and water collector. 2.436880 6.372520 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 2 0.2 0.0347 Lake_Nokoué st3 Benin Lagoon Datokokpa Lagoon Lagoon area near the Dantokpa market 2.427116 6.397500 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 3 0.2 0.0052 Lake_Nokoué st4 Benin Lagoon Agbanto Lagoon Area of the lagoon where waste is dumped near Agbanto 2.439440 6.238638 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 4 0.2 0.0452 Lake_Nokoué sgel 1 Lake Lake Nokoe Full water of Lake village 2.373131 6.454654 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 5 0.2 0.0392 Lake_Nokoué szel 2 Lake Lake Nokoe Full water of Zogbo 2.395795 6.403010 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 6 0.2 0.0253 Lake_Nokoué scal ln Lake Lake Nokoe acadja of the channel-1 2.436024 6.393335 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 7 0.2 0.1266 Lake_Nokoué szal ln Lake Lake Nokoe acadja of Zogbo 2.395660 6.426216 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 8 0.2 0.0285 Lake_Nokoué sea 2 ln Lake Lake Nokoe acadja at the mouth of Lake 2.537094 6.431235 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 9 0.2 0.0318 Lake_Nokoué sga 1 ln Lake Lake Nokoe acadja of Lake village-1 2.477007 6.463673 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 10 0.2 0.0315 Lake_Nokoué sga 2 ln Lake Lake Nokoe acadja of Lake village-2 2.420483 6.462766 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 11 0.2 0.2226 Lake_Togo st 1 Togo Lake Lake Togo/Lac Togo Sewatrikopé 1.514903 6.230256 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 1 0.2 0.0025 Map_ Lake Togo _Togo_3.png Lake_Togo st 2 Togo Lake Lake Togo/Lac Togo Kpessi 1.452806 6.223409 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 2 0.2 0.0022 Lake_Togo st 3 Togo Lake Lake Togo/Lac Togo Pont de Zébé 1.595951 6.232754 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 3 0.2 0.0092 Lake_Togo st 4 Togo Lake Lake Togo/Lac Togo Zalivé 1.581553 6.255111 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 4 0.2 0.0059 Lagos_Lagoon NST 1 Lagoon Lagos Lagoon Abule Eledu 3.401000 6.525000 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 1 0.2 0.0627 Map_Lagoos Lagoon_Nigeria_5.png Lagos_Lagoon NST 2 Lagoon Lagos Lagoon Oworosoki 3.408000 6.548000 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 2 0.2 0.1755 Lagos_Lagoon NST 3 Lagoon Lagos Lagoon Ogolonto 3.464000 6.602000 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 3 0.2 0.0421 Lagos_Lagoon NST 4 Lagoon Lagos Lagoon Ibeshe 3.472000 6.558000 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 4 0.2 0.0112 Lagos_Lagoon NST 5 Lagoon Lagos Lagoon Ofin 3.488000 6.599000 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 5 0.2 0.0031 Lagos_Lagoon NST 6 Lagoon Lagos Lagoon Bayeku 3.552000 6.537000 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 6 0.2 0.0301 Lagos_Lagoon NST 7 Lagoon Lagos Lagoon Langbasa 3.578000 6.507000 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 7 0.2 0.0041 Lagos_Lagoon NST 8 Lagoon Lagos Lagoon Iddo 3.384000 6.470000 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 8 0.2 0.7145 Lagos_Lagoon NST 9 Lagoon Lagos Lagoon Oyingbo 3.388000 6.477000 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 9 0.2 0.0537 Lagos_Lagoon NST 10 Lagoon Lagos Lagoon Okobaba 3.397000 6.494000 Direct Mercury Analyser (DMA-80) at Department of Marine and Fisheries Science Department, University of Ghana, Ghana 10 0.2 0.0815