scholarly journals Chemical Speciation and Distributon of Heavy Metals in Alluvial Soils of Ondo State

2019 ◽  
pp. 1-11
Author(s):  
Fadojutimi Paul Olawale ◽  
Aiyesanmi Festus Ademola ◽  
Adelaja Oluwaseun Adekoya
Keyword(s):  
Heavy Metals ◽  
Chemical Speciation ◽  
Alluvial Soil ◽  
Anthropogenic Sources ◽  
Residual Fraction ◽  
Soil Matrix ◽  
Pollution Levels ◽  
Mn Oxide ◽  
Exchangeable Fraction ◽  
Ondo State

Floodplains are very important for agriculture, since it allows planting of arable crops throughout the year. In order to asses pollution levels of the floodplains due to contamination from flooding,soil samples were collected from six locations across each of the floodplain of Owena river, Ogbese river and Ala river in Ondo State. The study investigated the chemical speciation of Cd, Cu, Ni and Zn in the alluvial soil matrix due to deposition of metals as result of inundation of the floodplains. The heavy metals were quantified using Atomic Absorbtion Spectrophotometer. The concentration of heavy metals in  exchangeable fraction  are in the order of Ni (BDL-0.26 mg/kg) < Cd (BDL - 0.41 mg/kg) < Cu (0.08-1.33 mg/kg) < Zn (0.27-7.08 mg/kg), in carbonate fraction: Ni (BDL-0.53 mg/kg) < Cd (BDL – 1.83 mg/kg< Cu (0.13-3.02 mg/kg) < Zn (0.64-11.88 mg/kg), in Fe-Mn Oxide fraction: Cd (BDL-0.21 mg/kg)  < Ni (BDL-0.53 mg/kg)  < Cu (0.68-3.03 mg/kg) < Zn (3.05-17.32 mg/kg), In organic fraction: Cd (BDL-0.15 mg/kg) < Cu (0.51-6.00 mg/kg) < Ni (0.73-7.84mg/kg ) < Zn (1.80-21.82 mg/kg), In residual fraction: Cd (0.20-1.28 mg/kg)  <  Cu (1.18-6.19 mg/kg)  <  Zn (2.77-13.97 mg/kg) < Ni (1.54-13.59 mg/kg). Cd and Ni were most abundant in residual fraction, Cu was found to be predominantly associated with organic and residual fractions while, Zn was  predominantly bound to oxidizable and organic fractions The mean concentration of the heavy metals in the floodplains soil were of the order of Zn > Cu > Ni > Cd. The speciation study futher revealed both geogenic and anthropogenic sources contributed to the total metal load of the floodplain soils.

scholarly journals Chemical Speciation and Mobility Factors of Heavy Metals in Soil Around an Integrated Steel Complex Communities

2021 ◽  
Vol 46 (2) ◽  
Author(s):  
M. A. Balogun ◽  
S. H. O. Egboh ◽  
M. O. Money-Irubor
Keyword(s):  
Heavy Metals ◽  
Chemical Speciation ◽  
Residual Fraction ◽  
Wet Season ◽  
Future Health ◽  
Mn Oxide ◽  
Physiochemical Parameters ◽  
Mobility Factor ◽  
Exchangeable Fraction ◽  
Composite Samples

Some heavy metals, consisting of Fe, Cd, Co, Cu, Mn, Ni, Pb and Zn were determined using USEPA Method 3050B for total metal concentration. Six composite samples were located from Aladja (ALJ), Ovwian (OVW), Ejevwu (EJW), Ekete Inland (EKI}, Orhuwhorun (ORH), and Otor-Udu (OTU) towns. In addition, chemical speciation was carried out on these samples using method employed by Tessier et al. as modified by Kersten and Forstner to assess their speciation pattern and the fraction of abundance as determinant of environmental pollution. From the results obtained, concentrations of Fe, Cd and Mn were more predominant in the residual fraction (F5) in the form of Fe3+, Cd2+ Mn2+ respectively for both wet and dry seasons. Co was more in the exchangeable fraction (F1) as Co2+ for both seasons. Concentration of Cu in the form of Cu2+ is higher in Fe-Mn oxide fraction (F3) for wet season and dry season’s organic fraction (F4). Pb and Zn were abundant in Fe-Mn oxide fraction (F3) for both seasons as divalent ions. Mobility factor calculated for the metals shows pattern in the order: Pb > Co > Zn > Mn > Fe > Cd > Cu > Ni for wet season and Co > Zn > Mn > Cu > Pb > Ni > Cd > Fe for dry season; which is as a result of changes in some physiochemical parameters such as acidity, pH, among others. From this result, there is the need to ensure that future health catastrophe is averted from the accumulation and release of Pb2+, Zn2+, Co2+ and Mn2+ especially into the environment.

CHEMICAL FORMS OF Zn, Mn, Fe and Pb IN SOIL SAMPLES FROM THE VICINITY OF SOME MAJOR DUMPSITES IN GOMBE METROPOLIS, GOMBE STATE NIGERIA

2020 ◽  
Vol 45 (4) ◽  
Author(s):  
A.O. Abdullahi ◽  
A. Usman ◽  
A.H. Zakari ◽  
J.R. Tukur
Keyword(s):  
Organic Matter ◽  
Extraction Method ◽  
Chemical Speciation ◽  
Research Work ◽  
Soil Samples ◽  
Residual Fraction ◽  
Mn Oxide ◽  
Exchangeable Fraction ◽  
Sequential Extraction Method ◽  
Atomic Absorption Spectrometric

This research work is aimed at determining the chemical speciation of metals Zn, Mn, Fe and Pb in soil samples from three major dumpsites within Gombe metropolis, Gombe state. The renowned five steps Tessier sequential extraction method was employed in the extraction of the heavy metals. The metals were extracted into five fractions namely: Exchangeable (F1), carbonate bound (F2), Fe-Mn oxide bound (F3), Bound to organic matter (F4) and the residual fraction (F5) in order of decreasing mobility. The elemental analysis of the fractions was carried out using atomic absorption spectrometric technique. The results showed Zn was predominantly bounded to the exchangeable fraction with 32.66±0.31 mg/kg (54.18%) and least in the Fe – Mn oxide fraction with 0.01±0.00 mg/kg (0.02%). The trend in its abundance is in the order F1> F2>F5>F4>F3. Mn was predominantly associated with the bound to carbonates fraction with the value of 103.3.±3.30 mg/kg (56.14%) and least in the exchangeable with the value of 1.30±1.85mg/kg (2.13%) its occurred in the order F2>F3>F4>F5>F1. The concentration of Fe was highest in the residual fraction with the value of 25.90±1.75mg/kg (45.45%)and least in the carbonate bound fraction wi th 5.10±0.40 mg/kg (2.13%) the order is F5>F4>F3>F2>F1. Pb was not detected in most of the fraction but highest in bond to carbonate and bond to organic matter fraction with the values of 6.64±4.12 mg/Kg (70.64 %) and 2.76±0.10 mg/Kg (29.36 %) respectively in two different samples. It was however established that Zn, Mn and Pb were mostly associated with the first three fractions thus, showed high bio-availabilty whereas Fe was found in the residual fraction and is expected to be low in mobility and less bioavailable. 

scholarly journals Chemical Speciation and Potential Mobility of some Metals of Selected Farmland in Kogi State, North Central Nigeria

2021 ◽  
Vol 28 (1) ◽  
pp. 48-55
Author(s):  
J.E. Emurotu
Keyword(s):  
Heavy Metals ◽  
Agricultural Soils ◽  
Metal Speciation ◽  
Residual Fraction ◽  
Food Crops ◽  
Residual Soil ◽  
North Central ◽  
Mn Oxide ◽  
Exchangeable Fraction ◽  
Potential Mobility

The contamination of agricultural soils with heavy metals is of concern because if the soil is contaminated, the metals can be transferred to food crops. The availability of these metals to food crops depends on the forms in which they are present in the soils. In this study, sequential extraction technique was applied to assess the exchangeable, carbonate-bound, Fe-Mn oxide bound, organic bound and residual fractions in the topsoil of farmlands in Kogi State, North Central Nigeria. Proportions in non-residual soil phases were 82.6 % Cd, 48.6 % Co, 72.5 % Cu, 73.2 % Ni, 41.9 % Pb, and 84.3 % Zn. Lead (Pb) and cobalt (Co) showed the highest phase of 58.1% and 51.4 %, respectively in the residual phase. The low concentration of lead in the non-residual fraction (41.9 %) and the highly mobileexchangeable phase and pH sensitive carbonate phase is an indication that there is no increase in anthropogenic input of Pb into the environment. Cadmium, zinc and nickel are most abundant in exchangeable fraction and this can be of concern especially cadmium. Keywords: Heavy metals, Metal speciation, Farmlands, Food crops, Metal uptake

scholarly journals Bioavailability and Assessment of Metal Contamination in Surface Sediments of Rades-Hamam Lif Coast, around Meliane River (Gulf of Tunis, Tunisia, Mediterranean Sea)

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Rim Ben Amor ◽  
Asma Yahyaoui ◽  
Myriam Abidi ◽  
Lasaad Chouba ◽  
Moncef Gueddari
Keyword(s):  
Heavy Metals ◽  
Mediterranean Sea ◽  
Surface Sediments ◽  
Total Concentration ◽  
Anthropogenic Sources ◽  
Residual Fraction ◽  
Gulf Of Tunis ◽  
Exchangeable Fraction ◽  
Geochemical Indices ◽  
Low Toxicity

The total concentration and the speciation of heavy metals (Pb, Cd, Cu, Zn, Ni, and Cr) in surface sediments of Rades-Hamam Lif coast were determined, with particular focus on the effect that urban and industrial waste in the Meliane river has on the estuary and coastal surface sediments of the Rades-Hamam Lif coast, off the Mediterranean Sea. Several geochemical indices were applied to assess the risk of contamination and the environmental risks of heavy metals on surface sediments. The total concentrations of these heavy metals are influenced by runoff, industrial, and urban wastewater. The Cd, Pb, Zn, and Ni are affected by anthropogenic sources, especially at the mouth of the Meliane river. The sequential extraction of Cd was presented dominantly in the exchangeable fraction and thus the high potential bioavailability. In contrast, Cr and Cu were mostly bound to the residual fraction indicating their low toxicity and bioavailability. The order of migration and transformation sequence was Cd > Pb > Ni > Zn > Cr > Cu, and the degree of pollution was Cd > Pb > Ni > Zn > Cr > Cu.

scholarly journals Assessment Of Labile Metals In Effluents From Lubricating Oil Company In Osogbo Osun State, Nigeria

1970 ◽  
Vol 10 (5) ◽  
pp. 675-690
Author(s):  
A.O Adeniji ◽  
I.O. Olabanji ◽  
E.A. Oluyemi
Keyword(s):  
Heavy Metals ◽  
Metal Ion ◽  
Dry Season ◽  
Lubricating Oil ◽  
Residual Fraction ◽  
Wet Season ◽  
Sediment Samples ◽  
Mn Oxide ◽  
Exchangeable Fraction ◽  
Oil Company

Effluent and sediment samples were collected on seasonal basis, comprising of three months (August to October) in the wet season and three months (December to February) in the dry season from five points around a lubricating oil company in Osogbo - Nigeria. The sequential extraction method was used to respectively fractionate the sediment and effluent samples, then analyzed by Atomic Absorption Spectrophotometry (AAS) to determine concentrations of five heavy metals: Mn, Ni Co, Cd and Pb. Results showed that in wet season, higher concentration of Mn was found in exchangeable fraction, Ni  and Pb were more pronounced in carbonate bound fraction, Cd in Fe-Mn oxide fraction, while Co was more in residual fraction. In dry season, Pb was more concentrated in exchangeable fraction, Coin residual fraction, Mn in Fe-Mn oxide fraction, Cd in organic matter bound, while Ni was more concentrated in the carbonate fraction. In both seasons for sediment samples, Cd concentrations were found above the set limit by WHO. The speciation study of the effluent showed that, Mn, Co and Ni concentration were found more in Organic substances fraction in both seasons, Pb was more concentrated in free metal ion fraction in wet season while it was high in organic fraction in the dry season. Concentrations of all metals in the effluent samples in both seasons were above the maximum permissible limit for effluent. The high mobility factors of heavy metals in the sediment indicated that the metals were labile and bioavailable thereby making the soil and the living organisms vulnerable to possibility of high heavy metal bioaccumulation.Key Words: Heavy Metals, Speciation, Effluents, Sediment

scholarly journals Assessment of heavy metals pollution in sediment of Citarum River, Indonesia

2020 ◽  
Vol 10 (4) ◽  
pp. 584-593
Author(s):  
Mutia Oktarina Permai Yenny ◽  
Arief Hartono ◽  
Syaiful Anwar ◽  
Yumei Kang
Keyword(s):  
Heavy Metals ◽  
Extraction Procedure ◽  
Potential Ecological Risk ◽  
Water Soluble ◽  
Anthropogenic Sources ◽  
Residual Fraction ◽  
Risk Level ◽  
Risk Assessment Code ◽  
Heavy Metals Pollution

Heavy metals have been reported to accumulate in sediment of Citarum River. The measurement of total heavy metals may not be able to provide information about the exact dimension of pollution, thus the determination of different fractions assumed great importance. This study was performed to determine chemical fractions of heavy metals (Cu, Ni, Cr, Pb and Cd) in sediment collected at 8 locations from Citarum River. The sequential extraction procedure was used to extract heavy metals in water-soluble, acid-soluble, MnO occluded, organically bound, FeO occluded and residual fraction in sediment. Bioavailability and potential ecological risk level of heavy metals were evaluated based on bioavailability factor (BF) and risk assessment code (RAC) method. The results showed that Cu, Ni, Cr were mostly in residual form, indicate those from geological sources. Cu had low bioavailability and no risk in all sediment samples of Citarum River. Ni and Cr each was found to have risk at 2 locations. Pb and Cd were found dominantly in non-residual fraction, suggest those from anthropogenic sources. BF and RAC analysis of Pb and Cd suggest that there is a potential risk to the aquatic environment.

Speciation and Mobility of Heavy Metals in Tailings from Dachang Mine, China

2014 ◽  
Vol 894 ◽  
pp. 266-270
Author(s):  
Quan Bi Huang ◽  
Hui Li Liu ◽  
Yi Nian Zhu ◽  
He Hua Zheng
Keyword(s):  
Heavy Metals ◽  
Chemical Analysis ◽  
Sequential Extraction ◽  
Chemical Speciation ◽  
Extraction Procedure ◽  
Major Elements ◽  
Sequential Extraction Procedure ◽  
Residual Fraction ◽  
Guangxi Province ◽  
Trace Heavy Metals

Two carbonate tailing samples were collected from Dachang mine tailing reservoirs, Guangxi Province, China. The chemical speciation of Zn, As, Cd and Sb contained in tailing samples were determined by Dold seven-stage sequential extraction procedure, as well as mineralogical and chemical analysis. Then the potential migration abilities of these heavy metals were evaluated. The tailing analysis results showed that the main minerals were calcite, quartz, sphalerite and pyrite, the major elements were Si, S, Ca, Fe and Al, and the trace heavy metals included Zn, As, Cd and Sb. Zn mainly existed in secondary sulfide, primary sulfides and residual fraction, and As was in primary sulfide and residue, but Sb and Cd was residual fraction. The mobility of heavy metals followed the order: Zn > Sb > Cd > As.

scholarly journals Chemical Speciation of some Heavy Metals in Sand Filter Media [SFM] Waste Dumpsite in Yenagoa, Nigeria

2020 ◽  
Vol 24 (4) ◽  
pp. 549-556
Author(s):  
I.L. Ikoko ◽  
C.I. Osu ◽  
M. Horsfall
Keyword(s):  
Heavy Metals ◽  
Chemical Speciation ◽  
Total Concentration ◽  
Speciation Analysis ◽  
Filter Media ◽  
Sand Filter ◽  
Exchangeable Fraction ◽  
Sequential Extraction Method ◽  
Chemical Availability ◽  
Living Organisms

The chemical speciation of five heavy metals [HMs] in spent sand-filter-media [SFM] waste dumpsite was investigated with a view to ascertain their distribution and chemical availability of the heavy metals in the dumpsite. Samples were collected at the surface, 100cm depth of the dumpsite and 100m away from the dumpsite and analysed using FAAS for total concentration of Cr, Fe, Mn. Ni and Pb. Speciation analysis was carried out usingmodified Tessier’s sequential extraction method. The percentage concentrations showed that Pb occurred more at the exchangeable fraction with 90.6% at the top, 91.34% at 100cm depth. This signifies that Pb is biochemically available for in-take by living organisms. Fe had the highest concentration by mass 12mg/g but its occurrence of between 22- 28% is in the residual/inert fraction. Ni had 40% in the exchangeable and  carbonate fractions at the surface and at 100cm depth. Cr had highest exchangeable fraction of 46.29% and 45.59% at the surface and 100cm depth of the SFM. Mn had 37.30% and 42.26% at the surface and at 100cm depth of the SFM. Although Fe had highest concentration by mass, it is least biochemically available occurring more at the residual/inert fraction while the other four metals [Pb, Ni, Cr, Mn] are all biochemically available for intake by organisms and may enhance biochemical accumulation overtime and finally become harmful to living organisms around that dumpsite. Keywords: Speciation, Heavy metals, Sand Filter Media, Waste Dumpsite

Enrichment, inter-relationship, and fractionation of heavy metals in road-deposited sediments of Sydney, Australia

Soil Research ◽  
2012 ◽  
Vol 50 (3) ◽  
pp. 229 ◽  
Author(s):  
Thamer Mohammed ◽  
Paripurnanda Loganathan ◽  
Andrew Kinsela ◽  
Saravanamuthu Vigneswaran ◽  
Jayakumar Kandasamy
Keyword(s):  
Heavy Metals ◽  
Road Traffic ◽  
Pollution Index ◽  
Residual Fraction ◽  
Traffic Density ◽  
Exchangeable Fraction ◽  
Total Concentrations ◽  
Tyre Wear ◽  
Cu And Zn ◽  
Sydney Australia

Urban road-deposited sediments (RDS) are potential sources of heavy metal pollution of both terrestrial and aquatic environments. We determined the heavy metals enrichments, their possible sources, and potential bioavailability and mobility in RDS from nine sites along major motorways of Sydney, the largest city with highest road traffic density in Australia. Mean total concentrations of metals in the RDS decreased in the order: Fe > Mn > Zn > Cu > Cr > Pb > Ni > Cd. The corresponding order in the background soils (minimally contaminated from roads) was: Fe > Mn > Zn ~ Ni > Cu ~ Pb > Cr > Cd. Both the pollution index (PI) and metal enrichment factor (EF), which are comparative measures between contaminated and uncontaminated sites, were highest for Cu and Zn. Inputs of Cu and Zn to RDS were likely to be mainly the result of brake and tyre wear, respectively. Cluster and correlation analyses showed that while the concentrations of these two metals were related in the soil, they were not correlated in RDS. Low PI and EF values as well as the close inter-relationships of Fe, Mn, Cr, and Ni in both RDS and soils suggest that these metals were derived mainly from natural sources. Metal fractionation data showed 50–95% of Cr and Fe in RDS to be present in the immobile and bio-unavailable residual fraction, whereas 15–65% of Zn was contained in the exchangeable fraction, which is considered to be mobile and bioavailable.

scholarly journals Removal behavior and chemical speciation distributions of heavy metals in sewage sludge during bioleaching and combined bioleaching/Fenton-like processes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Chunsheng Qiu ◽  
Shangyu Xie ◽  
Nannan Liu ◽  
Kequan Meng ◽  
Chenchen Wang ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Chemical Speciation ◽  
Speciation Analysis ◽  
Residual Fraction ◽  
Combined Process ◽  
Capillary Suction ◽  
Ph Values ◽  
Mobile Forms ◽  
Removal Efficiencies

AbstractThe removal and chemical speciation changes of heavy metals in the sewage sludge during the single bioleaching and combined bioleaching/Fenton-like processes were compared in this study. The improvement in the dewaterability of the treated sludge was also investigated. The single bioleaching led to a removal of Zn, Cu, Cd, Cr, Mn, Ni, As and Pb of 67.28%, 50.78%, 64.86%, 6.32%, 56.15%, 49.83%, 20.78% and 10.52% in 10 days, respectively. The chemical speciation analysis showed that the solubilization of heavy metals in mobile forms (exchangeable/acid soluble and reducible forms) and oxidizable form was the main reason for their removal. Subsequent Fenton-like treatment was carried out at different bioleaching stages when the bioleached sludge dropped to certain pH values (4.5, 4.0 and 3.0), by adding H2O2 at different dosages. The highest removal ratio of Zn, Cu, Cd, Cr, Mn and Ni could reach 75.53%, 52.17%, 71.91%, 11.63%, 66.29% and 65.19% after combined bioleaching/Fenton-like process, respectively, with appropriate pH and H2O2 dosages in less than 6 days. The solubilization efficiencies of these heavy metals in mobile forms were further improved by Fenton-like treatment. The removal efficiencies of As and Pb decreased due to their transformation into insoluble forms (mostly residual fraction) after Fenton treatment. The capillary suction times (CST) of the raw sludge (98.7 s) decreased by 79.43% after bioleaching and 87.44% after combined process, respectively.

Sign in / Sign up

Export Citation Format

Share Document