scholarly journals The heavy metals/trace elements contents of sediments from Owalla Reservoir, Osun State, Southwest Nigeria

2018 ◽  
Vol 9 (2) ◽  
Author(s):  
Adedeji Idowu Aduwo ◽  
Israel Funso Adeniyi
Keyword(s):  
Heavy Metals ◽  
Trace Elements ◽  
Open Water ◽  
Annual Cycles ◽  
Sediment Samples ◽  
Littoral Region ◽  
Water Region ◽  
Southwest Nigeria ◽  
Definite Pattern ◽  
Horizontal Variations

The heavy metals/trace elements contents of sediment samples from Owalla Reservoir were analyzed every three months in two annual cycles (March 2011 – February 2013). The main aim was to measure concentrations of selected elements in sediment samples, their variations in space and seasons and the level of pollution and/or contamination. The bottom sediment samples were collected with a Van Veen Grab and the elemental analysis in the laboratory was based on air-dried samples following standard methods. The overall hierarchy of heavy metals/trace elements in the sediments of the reservoir was in the decreasing order of concentrations: Fe > Mn > As > Zn > Ni > Co > Cr > Cu > Pb > Cd. The concentrations of the heavy metals did not follow any definite pattern from the upstream-downstream basin, although most of them (Cu, Fe, Mn, Zn, and Co) showed significant differences (P<0.05) in their horizontal variations. Mn, Pb, Co, Fe, Ni, and Zn were significantly (P<0.05) higher at the open water region than in the littoral region. All the elements except Ni did not show significant seasonal variations (P>0.05). Most of the elements in the reservoir sediment have concentrations within the background levels and concentrations defined in environmental regulations and guidelines, except for As and Cd. The contamination factors (Cf) for most metals (Co, Cr, Cu, Fe, Mn, Ni, Pb, and Zn) suggested low contamination in the sediments (Cf < 1.0). Conversely, the sediments were moderately contaminated with Cd (Cf = 2.41) and very highly contaminated with As (Cf = 19.33).

scholarly journals Deri Fabrikası Atık Sularının Ağır Metal İçeriğinin Belirlenmesi

2020 ◽  
Vol 8 (3) ◽  
pp. 752 ◽  
Author(s):  
Özgür Canpolat ◽  
Metin Çalta
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Water Samples ◽  
Metal Pollution ◽  
Heavy Metal Pollution ◽  
Open Water ◽  
Water Region ◽  
Standard Values ◽  
One Year ◽  
Very High

In this study, it is aimed to determine the heavy metal pollution caused by wastewaters of leather factory in Keban Dam Lake (Agın region). For this purpose, water samples were taken monthly during one year from the selected stations (wastewater of leather factory, wastewater discharged region and open water region). The concentrations of some heavy metals (Cu, Fe, Zn, Cr, Ni, Cd, As and Hg) were determined in water samples. The ranges of elements were found as Cu=11.71-19.14; Fe=82.03-169.92; Zn=39.06-70.31; Cr=58.59-82.03; Ni=2.5-10.25; Cd=45-72.5 mg/L; As=43.57-76.0 and Hg=0.42-0.76 µg/L in wastewater; Cu=6.25-9.74; Fe=42.96-87.89; Zn=16,21-42,96; Cr=39,06-58.59; Ni=1.22-7.25; Cd=23.75-45.0 mg/L; As=20.32-37.92 and Hg=0.19-0.38 µg/L in discharged water to dam lake, Cu=0.31-0.52; Fe=0.24-0.54; Zn=0.43-0.67; Cr=0.05-1.12; Ni=0.002-0.004 and Cd=0.009-0.02 mg/L in open water respectively. It has been determined that heavy metal pollution is very high in the wastewater of leather factory and discharged water to Dam Lake. Among these heavy metals, the most accumulated metal was chromium. In all three regions, the lowest concentrations were found in winter and the highest concentrations were found in summer. The results were compared with tolerable values for heavy metals provided from the WHO, EC and USEPA standards for freshwater. Cu, Fe, Zn, Cr and Ni concentrations in the wastewater and discharged water to the Dam Lake were found above the standard values given by WHO, EC and USEPA.

Dietary Exposure of Heavy Metals, Minerals and Trace Elements through Cereals Commonly Consumed by Dhaka City Residents

2020 ◽  
Vol 16 (5) ◽  
pp. 815-823
Author(s):  
Md. Bayejid Hosen ◽  
Abu T.M. Abdullah ◽  
Md. Z.H. Howlader ◽  
Yearul Kabir
Keyword(s):  
Heavy Metals ◽  
Trace Elements ◽  
Inductively Coupled Plasma ◽  
Industrial Development ◽  
Daily Intake ◽  
Dietary Exposure ◽  
Risk Level ◽  
Dhaka City ◽  
Main Meal ◽  
Minerals And Trace Elements

Background: Contamination of soil and agricultural products by heavy metals resulting from rapid industrial development has caused major concern. Dietary exposure to heavy metals has been associated with toxic and adverse health effects. The main threats to human health from heavy metals are associated with exposure to Pb, Cd and Hg. The aim of this study was to monitor the presence of heavy metals, minerals and trace elements in cereals consumed by Dhaka city residents. Methods: One hundred and sixty cereal samples were collected for eight (08) composited samples and analyzed for the determination of sixteen elements. Heavy metals were analyzed by Inductively Coupled Plasma Mass Spectrometry (ICP-MS), and other elements were determined by Atomic Absorption Spectrometry (AAS). Results: The average concentrations of elements in cereals fall within the safe limit except for Pb, Cr, Na and Mg, which exceeded the safe limits. The daily intake of Cd (23.0 μg), Hg (63.0 μg) and As (13.6 μg) through cereals was below the risk level except for Pb (634.0 μg) and Cr (263.1 μg). The dietary intake of Na (1860.0 mg), Mg (347.0 mg) and Mn (4600.0 μg) exceeded the toxic level while K (829 mg) was below the RDA. Conclusion: As the main meal of average Bangladeshi people is boiled rice served with some vegetables, our findings indicate that the residents of Dhaka city are at risk from Pb and Cr contamination and their dietary need for some important minerals and trace elements is not fulfilled by cereals.

scholarly journals Assessment of heavy metals contamination and associated risks in shallow groundwater sources from three different residential areas within Ibadan metropolis, southwest Nigeria

2021 ◽  
Vol 11 (5) ◽  
Author(s):  
Saheed Adekunle Ganiyu ◽  
Abimbola Temitope Oyadeyi ◽  
Azeem Adedeji Adeyemi
Keyword(s):  
Heavy Metals ◽  
Cancer Risk ◽  
Urban Area ◽  
Ecological Risk ◽  
Water Samples ◽  
Risk Index ◽  
Shallow Groundwater ◽  
World Health ◽  
Southwest Nigeria ◽  
The Mean

AbstractThis study has been conducted to appraise the concentrations of selected heavy metals and total dissolved solids (TDSs) in the drinking water from shallow wells in parts of Ibadan metropolis, southwest Nigeria. Fifteen (15) water samples were collected from three representative residential locations [traditional core area (TCA), peri-urban area (PUA), and urban area (UA)] for geochemical analysis. Heavy metals and TDS were analyzed with the aid of atomic absorption spectrophotometer and calibrated meter, respectively. The mean concentration (mg/L) of Zn, Pb Mn, Fe, and Cd has been 3.930, 0.658, 0.0304, 1.698, and 0.501, respectively, and as a consequence, the order of abundance of studied metals was Zn > Fe > Pb > Cd > Mn. Concentrations of Zn, Fe, Pb, and Cd were higher than recommended standards in 60%, 86.7%, 100%, and 100% of groundwater samples, respectively. However, at all points tested, the mean concentrations of Mn and TDS in water samples lie within the safe limits set by World Health Organization. The evaluation of geoaccumulation index (Igeo), enrichment factor (EF), and contamination factor suggests that representative water samples were low-to-moderate contamination. The potential ecological risk index advocates low-to-moderate ecological risk in TCA and PUA, while it demonstrated exclusive “moderate” risk in UA. Further, the range of pollution load index (PLI) (0.55–1.32) in both TCA and PUA shows nil-to-moderate pollution status, while PLI values > 1 in UA indicate moderate contaminated state. The degree of contamination in groundwater showed the following trends: UA > TCA > PUA in the study area. Moreover, the results of EF and quantification of contamination of analyzed metals in water samples indicate geogenic and anthropogenic inputs. The contribution of studied metals to the incidence of non-cancer risk via oral intake within the residential sites follows the order: cadmium > lead > zinc > iron > manganese. The hazard index as a result of ingested heavy metals for the three population classes surpasses the acceptable range in the order of infant < child < adult. Cadmium and lead made considerable impact to the estimation of cancer risk in the study area for the three human population categories. Factor analysis extracted only one component that explained 94.64% of the entire variance, while cluster analysis identified three distinct groups based on similar water quality characteristics. Based on the findings of the study, awareness programs toward protecting the shallow groundwater sources should be launched, encouraged, and sustained. Moreover, the study suggests better hygienic practices and pre-treatment of contaminated water before consumption.

Study of the toxic heavy metals, macroelements, trace elements and microelements content in feathers of kestrel (Falco tinnunculus) in Tenerife

2016 ◽  
Vol 258 ◽  
pp. S215-S216
Author(s):  
M. Rodríguez Álvarez ◽  
A.J. Gutiérrez Fernández ◽  
D. González Weller ◽  
C. Rubio Armendáriz ◽  
J.M. Caballero Mesa ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Trace Elements ◽  
Falco Tinnunculus ◽  
Toxic Heavy Metals
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