Isotopic and hydrogeochemical characterization of groundwater and surface water from a mine site in Tanzania
This study used the hydrochemical properties of water to reveal the causes of water quality degradation. The results showed that most samples located downstream of the mine tailings dam were slightly acidic with pH as low as 4.6. Samples with high levels of Na+, Cl−, and could not be isotopically...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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IWA Publishing
2021-12-01
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| Series: | H2Open Journal |
| Subjects: | |
| Online Access: | http://doi.org/10.2166/h2oj.2021.119 |
| _version_ | 1811238221486489600 |
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| author | Musiba Masamba Musiba Mwemezi J. Rwiza |
| author_facet | Musiba Masamba Musiba Mwemezi J. Rwiza |
| author_sort | Musiba Masamba Musiba |
| collection | DOAJ |
| description | This study used the hydrochemical properties of water to reveal the causes of water quality degradation. The results showed that most samples located downstream of the mine tailings dam were slightly acidic with pH as low as 4.6. Samples with high levels of Na+, Cl−, and could not be isotopically linked to the local geochemistry, but the anthropogenic activities and evaporation were probably responsible for the observed water chemistry. The Piper diagram indicated cations were dominated by Ca and Mg, while anions were dominated by bicarbonates and sulphates. Pb and Hg levels (mean 70.29 and 17.95 μg/L, respectively) were all higher than the World Health Organization (WHO) and Tanzanian drinking water guidelines. Mining activities probably contributed to the observed low pH values and elevated concentration of cyanides, heavy metals, and metalloids. Stable isotope results indicated a vulnerability of the water to recent contamination that could be attributed to anthropogenic activities. Moreover, isotopic studies indicated a flow pattern from the eastern to the western side of the mine study site. Lowland samples were more 3H-enriched than highland ones. The present study concludes that groundwater recharge from recent local precipitation may have an impact on the sources studied. HIGHLIGHTS
Slightly acidic groundwater in Tanzania.;
Levels of Pb and Hg higher than Tanzanian WHO standards.;
Vulnerability of groundwater to recent contamination.;
Contamination could be linked to local anthropogenic activities.;
Contamination increased from east to west, towards Lake Victoria.; |
| first_indexed | 2024-04-12T12:37:59Z |
| format | Article |
| id | doaj.art-00e5514296ad47ed9070218ea6da3a9e |
| institution | Directory Open Access Journal |
| issn | 2616-6518 |
| language | English |
| last_indexed | 2024-04-12T12:37:59Z |
| publishDate | 2021-12-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | H2Open Journal |
| spelling | doaj.art-00e5514296ad47ed9070218ea6da3a9e2022-12-22T03:32:50ZengIWA PublishingH2Open Journal2616-65182021-12-014136638010.2166/h2oj.2021.119119Isotopic and hydrogeochemical characterization of groundwater and surface water from a mine site in TanzaniaMusiba Masamba Musiba0Mwemezi J. Rwiza1 School of Materials, Energy, Water and Environmental Sciences (MEWES), The Nelson Mandela African Institution of Science and Technology (NM-AIST), P.O. Box 447 Arusha, Tanzania School of Materials, Energy, Water and Environmental Sciences (MEWES), The Nelson Mandela African Institution of Science and Technology (NM-AIST), P.O. Box 447 Arusha, Tanzania This study used the hydrochemical properties of water to reveal the causes of water quality degradation. The results showed that most samples located downstream of the mine tailings dam were slightly acidic with pH as low as 4.6. Samples with high levels of Na+, Cl−, and could not be isotopically linked to the local geochemistry, but the anthropogenic activities and evaporation were probably responsible for the observed water chemistry. The Piper diagram indicated cations were dominated by Ca and Mg, while anions were dominated by bicarbonates and sulphates. Pb and Hg levels (mean 70.29 and 17.95 μg/L, respectively) were all higher than the World Health Organization (WHO) and Tanzanian drinking water guidelines. Mining activities probably contributed to the observed low pH values and elevated concentration of cyanides, heavy metals, and metalloids. Stable isotope results indicated a vulnerability of the water to recent contamination that could be attributed to anthropogenic activities. Moreover, isotopic studies indicated a flow pattern from the eastern to the western side of the mine study site. Lowland samples were more 3H-enriched than highland ones. The present study concludes that groundwater recharge from recent local precipitation may have an impact on the sources studied. HIGHLIGHTS Slightly acidic groundwater in Tanzania.; Levels of Pb and Hg higher than Tanzanian WHO standards.; Vulnerability of groundwater to recent contamination.; Contamination could be linked to local anthropogenic activities.; Contamination increased from east to west, towards Lake Victoria.;http://doi.org/10.2166/h2oj.2021.119environmental stable isotopesgroundwater pollutionheavy metals and metalloidslake victoria goldfieldsnorth mara gold minestanzania mine pollution |
| spellingShingle | Musiba Masamba Musiba Mwemezi J. Rwiza Isotopic and hydrogeochemical characterization of groundwater and surface water from a mine site in Tanzania H2Open Journal environmental stable isotopes groundwater pollution heavy metals and metalloids lake victoria goldfields north mara gold mines tanzania mine pollution |
| title | Isotopic and hydrogeochemical characterization of groundwater and surface water from a mine site in Tanzania |
| title_full | Isotopic and hydrogeochemical characterization of groundwater and surface water from a mine site in Tanzania |
| title_fullStr | Isotopic and hydrogeochemical characterization of groundwater and surface water from a mine site in Tanzania |
| title_full_unstemmed | Isotopic and hydrogeochemical characterization of groundwater and surface water from a mine site in Tanzania |
| title_short | Isotopic and hydrogeochemical characterization of groundwater and surface water from a mine site in Tanzania |
| title_sort | isotopic and hydrogeochemical characterization of groundwater and surface water from a mine site in tanzania |
| topic | environmental stable isotopes groundwater pollution heavy metals and metalloids lake victoria goldfields north mara gold mines tanzania mine pollution |
| url | http://doi.org/10.2166/h2oj.2021.119 |
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