Speciation of Selected Heavy Metals in Bottom Sediments of River Rwizi, Mbarara City, Uganda

Nijeje, Eustache; Senyonjo, Amos; Sahan, Sylivester Jonathan; Byamugisha, Denis; Ntambi, Emmanuel

doi:10.1007/s11270-023-06184-0

Cited by 5 publications

(3 citation statements)

References 36 publications

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“…The BioF of Fe in sediments showed a high positive linear regression with the concentration of Fe in the roots (Figure 12D). Cd concentrations stand out due to their correlation with certain textures pertaining to the sediment and organic matter in summer and autumn, but not with temperature, salt percentage, and pH, which coincides with previous literature [45,46]. These low concentrations in the dry season could be due to the immobilization of some of its mobile portions as a result of diagenesis, secondary to physicochemical and biological processes [45].…”

Section: Relationship Between Trace Metals In Sediments and Tissues O...supporting

confidence: 81%

RHIZOPHORA MANGLE as a Bioindicator of Environmental Exposure to Heavy Metals in the Navachiste Lagoon Complex, Sinaloa, Mexico

González-Ocampo,

Parra-Olivas,

Pérez-González

et al. 2023

Preprint

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The objective of this work was to analyze the potential of Rhizophora mangle as a bioindicator of seven heavy metals, Fe, Cu, Zn, Mn, Ni, Cr, and Cd, in the mangrove sediments of the Navachiste lagoon complex (NAV). The concentration of trace metals (TM) in sediments and tis-sues (leaf, stembark, and root of R. mangle) were determined by digestion with nitric acid (HNO3), whereas the metal absorbance was measured by atomic absorption spectrophotometry with an air-acetylene flame. The enrichment factor, the bioavailable fraction, the seasonal varia-tion of heavy metal concentrations and their correlation with those determined in R. mangle tissues were assessed. Metal concentrations found in sediments were as following: Fe>Mn>Zn>Cr>Ni>Cu>Cd, and for tissues: Mn>Fe>Zn>Cu>Cr>Ni>Cd, and regarding the roots, the findings were as following: Fe>Mn>Zn>Cu>Cr>Ni>Cd. The highest trace metal concentra-tions were correlated with silt, clay, and organic matter in sediments with basic pH. The highest salinities were found adjacent to R. mangle trees. Of all the trace metals analyzed, there was only a positive linear regression between the bioavailability of Mn in the sediment with the concen-tration of Mn in leaf tissue consistently throughout the year. The Cu bioavailability in the sedi-ment showed similar positive linear regressions except for winter, where it did not show this pattern. These results suggest that the concentrations of Mn and Cu in the R. mangle leaf could be a potential bioindicator of environmental exposure to anthropogenic sources of contamination by these trace metals in sediments

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Section: Relationship Between Trace Metals In Sediments and Tissues O...supporting

confidence: 81%

RHIZOPHORA MANGLE as a Bioindicator of Environmental Exposure to Heavy Metals in the Navachiste Lagoon Complex, Sinaloa, Mexico

González-Ocampo,

Parra-Olivas,

Pérez-González

et al. 2023

Preprint

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“…The river is traced to originate from the mountainous parts of Buhweju district. It has various tributaries emanating from the hilly regions of the Nkore area, covering a total distance of approximately 55 km with a catchment area of 2521 km 2 [22]. The river flows eastward for about 57 km until the gauge at Mbarara water works before it joins the Kagera transboundary river, which then pours into L. Victoria and progresses through the White Nile until the Mediterranean Sea in Egypt [30].…”

Section: Description Of the Targeted River And Its Stretch In Mbarara...mentioning

confidence: 99%

“…For River Rwizi (the focus of this study), there have been reports on its water quality and concentration of trace metals (TMTs), nutrients and polycyclic aromatic compounds in water, sediments, damselfly larvae (Ceriagrion glabrum) and selected fish species (Brycinus sadleri and Barbus altianalis) [18][19][20][21][22]. Heavy metals, sometimes called trace metals or potentially toxic elements, are naturally present in the earth's crust, but they are enriched in the environment following their release from various anthropogenic activities.…”

Section: Introductionmentioning

confidence: 99%

Enrichment, Bioaccumulation and Health Risks of Trace Metals in Soils and Leafy Vegetables Grown on the Banks of the Ugandan Lifeline River, River Rwizi

Rutehenda,

Adaku,

Omara

et al. 2024

World

Self Cite

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Urban vegetable farming in wetlands and riverbanks are common features of Ugandan cities. However, urbanization has led to various anthropogenic activities that can lead to the pollution of water resources, enrichment of pollutants in soils and, consequently, pollutant bioaccumulation in edible tissues of plants cultivated on such soils. In this study, we report on the levels of six trace metals (TMTs) in 75 samples of leafy vegetables (Brassica oleracea L., Spinacia oleracea L., Amaranthus hybridus L., Cucurbita pepo L. and Solanum nigrum L.) and soils (n = 75) grown on the banks of River Rwizi, the second longest river in Uganda only after the Nile River. The concentrations of TMTs (Mn, Zn, Cd, Pb, Cr and Cu) in edible vegetable tissues and soils were quantified using flame atomic absorption spectrometry. The mean concentrations (in mg kg−1) of the TMTs in the soil samples were 205–373.84 (Mn), 12.72–65.04 (Zn), 0.26–0.42 (Cd), 3.36–16.80 (Pb), 5.96–25.06 (Cr) and 2.83–35.27 (Cu). In vegetable samples, the concentrations ranged from 43.25 to 110.00 (Mn), 1.08 to 1.83 (Cd), 41.06 to 71.20 (Zn), 4.31 to 6.16 (Pb), 0.65 to 0.81 (Cr) and 5.70 to 14.35 (Cu). With the exception of Mn and Cr, the rest of the TMTs were bioaccumulated in the edible vegetable tissues (bioconcentration factors = 1.03 to 10.71). Considering chronic daily intake through ingestion, dermal contact and inhalation of the TMTs in soils from the banks of River Rwizi, there are no potential non-cancer and carcinogenic health effects that could be experienced in both adults and children. Consumption of leafy vegetables could pose both non-cancer health risks (from ingestion of Zn, Pb, Cr, Mn and Cd) and cancer health risks (due to intake of Cd) in both children and adults. There is therefore a need to enforce regulations to mitigate the pollution of River Rwizi for a more sustainable economic development.

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Heavy Metals in the Sediments of the Chilika Lake, India: Contamination, Source and Toxicity Analysis

Panda,

Ghosh,

Ballesta

et al. 2024

Water Air Soil Pollut

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Speciation of Selected Heavy Metals in Bottom Sediments of River Rwizi, Mbarara City, Uganda

Cited by 5 publications

References 36 publications

RHIZOPHORA MANGLE as a Bioindicator of Environmental Exposure to Heavy Metals in the Navachiste Lagoon Complex, Sinaloa, Mexico

RHIZOPHORA MANGLE as a Bioindicator of Environmental Exposure to Heavy Metals in the Navachiste Lagoon Complex, Sinaloa, Mexico

Enrichment, Bioaccumulation and Health Risks of Trace Metals in Soils and Leafy Vegetables Grown on the Banks of the Ugandan Lifeline River, River Rwizi

Heavy Metals in the Sediments of the Chilika Lake, India: Contamination, Source and Toxicity Analysis

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