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Nakaya S, Takada R, Yasumoto J, Masuda H, Yoshitani J, Shinjo R, Lugodisha I, Komakech H. Effect of groundwater residence time on geogenic fluoride release into groundwater in the Mt. Meru slope area, Tanzania, the Great Rift Valley, East Africa. JOURNAL OF CONTAMINANT HYDROLOGY 2023; 253:104125. [PMID: 36587422 DOI: 10.1016/j.jconhyd.2022.104125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Revised: 12/05/2022] [Accepted: 12/17/2022] [Indexed: 06/17/2023]
Abstract
People living in the Great Rift Valley in East Africa suffer from fluorosis resulting from their consumption of groundwater. This paper shows that geogenic fluoride contamination in a natural water system has changed in the last two decades in the Mt. Meru slope area of northern Tanzania based on water quality, dating of the residence time, and stable isotopes of groundwater. The results demonstrate that 1) the average recharge altitude of groundwater with a high geogenic fluoride concentration is estimated to range from 1900 m to 3000 m on the southern slope of Mt. Meru, and the fluoride concentration tends to increase with an increase in the recharge altitude, 2) the fluoride concentration increases with increasing groundwater residence time for groundwater with a residence time of 20 years or longer, suggesting that water-rock interaction processes (weathering, dissolution, and ion exchange), which depend on the contact time between the volcanic aquifer and groundwater, have predominated for approximately 20 years or longer, and 3) the mixing of aerobic young water and old groundwater has been active for approximately 20 years, and the fluoride concentration is increasing in some shallower well waters. The mixing of fluoride-contaminated groundwater with aerobic water infiltrating the aquifer through pumping groundwater in the last two decades may increase the spread of groundwater contaminated with fluoride due to increased water demand caused by rapid population growth, and urbanization, industrial growth, and the expansion of irrigated agriculture.
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Affiliation(s)
- Shinji Nakaya
- Department of Water Environment and Civil Engineering, Shinshu University, 4-17-1, Wakasato, Nagano 380-8553, Japan.
| | - Ryogo Takada
- Graduate School of Medicine, Science and Technology, Department of Science and Technology, Shinshu University, 4-17-1, Wakasato, Nagano 380-8553, Japan
| | - Jun Yasumoto
- Department of Regional Agriculture Engineering, University of the Ryukyus, Senbaru-1, Nishihara, Okinawa 903-0213, Japan
| | - Harue Masuda
- Urban Resilience Research Center, Osaka Metropolitan University, 3-3-138, Sugimoto, Suimyoshi-Ku, Osaka, 558-8585, Japan
| | - Junichi Yoshitani
- Department of Water Environment and Civil Engineering, Shinshu University, 4-17-1, Wakasato, Nagano 380-8553, Japan
| | - Ryuichi Shinjo
- Department of Physics and Earth Sciences, University of the Ryukyus, Senbaru-1, Nishihara, Okinawa 903-0213, Japan; Research Institute for Humanity and Nature, Motoyama 457-4, Kamigamo, Kita-ku, Kyoto 603-8047, Japan
| | - Innocent Lugodisha
- School of Materials, Energy, Water and Environmental Sciences, NM-AIST, Arusha, Tanzania
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Franco-Fuentes E, Moity N, Ramírez-González J, Andrade-Vera S, Hardisson A, Paz S, Rubio C, Martín V, Gutiérrez ÁJ. Mercury in fish tissues from the Galapagos marine reserve: Toxic risk and health implications. J Food Compost Anal 2023. [DOI: 10.1016/j.jfca.2022.104969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Cortés-Gómez AA, Romero D, Girondot M. The current situation of inorganic elements in marine turtles: A general review and meta-analysis. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2017; 229:567-585. [PMID: 28688307 DOI: 10.1016/j.envpol.2017.06.077] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2017] [Revised: 06/22/2017] [Accepted: 06/24/2017] [Indexed: 05/06/2023]
Abstract
Inorganic elements (Pb, Cd, Hg, Al, As, Cr, Cu, Fe, Mn, Ni, Se and Zn) are present globally in aquatic systems and their potential transfer to marine turtles can be a serious threat to their health status. The environmental fate of these contaminants may be traced by the analysis of turtle tissues. Loggerhead turtles (Caretta caretta) are the most frequently investigated of all the sea turtle species with regards to inorganic elements, followed by Green turtles (Chelonia mydas); all the other species have considerably fewer studies. Literature shows that blood, liver, kidney and muscle are the tissues most frequently used for the quantification of inorganic elements, with Pb, Cd, Cu and Zn being the most studied elements. Chelonia mydas showed the highest concentrations of Cr in muscle (4.8 ± 0.12), Cu in liver (37 ± 7) and Mg in kidney (17 μg g-1 ww), Cr and Cu from the Gulf of Mexico and Mg from Japanese coasts; Lepidochelys olivacea presented the highest concentrations of Pb in blood (4.46 5) and Cd in kidney (150 ± 110 μg g-1 ww), both from the Mexican Pacific; Caretta caretta from the Mediterranean Egyptian coast had the highest report of Hg in blood (0.66 ± 0.13 μg g-1 ww); and Eretmochelys imbricata from Japan had the highest concentration of As in muscle (30 ± 13 13 μg g-1 ww). The meta-analysis allows us to examine some features that were not visible when data was analyzed alone. For instance, Leatherbacks show a unique pattern of concentration compared to other species. Additionally, contamination of different tissues shows some tendencies independent of the species with liver and kidney on one side and bone on the other being different from other tissues. This review provides a general perspective on the accumulation and distribution of these inorganic elements alongside existing information for the 7 sea turtle species.
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Affiliation(s)
- Adriana A Cortés-Gómez
- Laboratoire Écologie, Systématique et Évolution, Université Paris-Sud, AgroParisTech, Centre National de la Recherche Scientifique, Université Paris Saclay, 91405 Orsay, France; Área de Toxicología, Facultad de Veterinaria. Campus Regional de Excelencia Internacional "Campus Mare Nostrum". Universidad de Murcia, E-30071 Murcia, Spain.
| | - Diego Romero
- Área de Toxicología, Facultad de Veterinaria. Campus Regional de Excelencia Internacional "Campus Mare Nostrum". Universidad de Murcia, E-30071 Murcia, Spain.
| | - Marc Girondot
- Laboratoire Écologie, Systématique et Évolution, Université Paris-Sud, AgroParisTech, Centre National de la Recherche Scientifique, Université Paris Saclay, 91405 Orsay, France.
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