Papers by Akinade Olatunji
CATENA, 2014
Heavy metal are often added to animal fodder and accumulate in the soils with swine manure. In th... more Heavy metal are often added to animal fodder and accumulate in the soils with swine manure. In this study, heavy metal (Cu, Pb, Cd, Zn, As and Cr) concentrations were determined in agricultural soils irrigated with swine manure in Jiangxi Province, China. Results showed that the average concentrations of Cu, Zn, As and Cr (32.8, 93.7, 21.3 and 75.8 mg/kg, respectively) were higher than the background values, while Pb and Cd (15.2 and 0.090 mg/kg, respectively) were lower than the background values. Contamination factors C i f indicated that they were generally moderate for Cu, Zn, As and Cr and generally low for Pb and Cd. The contamination degree (C d) was calculated to be 7.5-10.0 indicating a moderate degree of contamination. The geoaccumulation index (I geo) indicated that the soils were unpolluted with Zn, Cd and Pb, while unpolluted to moderately pollute with Cr, Cu and As. The single ecological risk factor E i r revealed that the six heavy metals all belonged to low ecological risk. The ecological risk indices suggested that all the sampling sites were at low risk level.
Chemistry Africa, May 21, 2022
Chinese Journal of Geochemistry, Mar 1, 2006
Environmental Geochemistry and Health, Jan 28, 2014
Trace metal concentrations were determined in particulate matter (PM 10) in ambient air of four p... more Trace metal concentrations were determined in particulate matter (PM 10) in ambient air of four purposively selected residential areas in Ibadan, Nigeria namely Bodija market (BM), Ojo Park (OP), Oluyole Estate (OE) and University of Ibadan (UI). PM 10 was determined in the morning (7-10 a.m.) and afternoon (2-5 p.m.) for 12 weeks in the dry season months of January-March using a volumetric sampler following standard procedures and levels compared with WHO guideline limits. Glass-fibre filter papers exposed to the particulate matter were digested using appropriate acid mixtures, and the digest analysed for trace metals including Ni, Cr, Mn, Zn, and Pb using ICPMS method and levels compared with WHO limits. Data was analysed using ANOVA and Pearson correlation test at 5 % level of significance. The highest mean PM 10 concentrations 502.3 ± 39.9 lg/m 3 were recorded in the afternoon period at BM, while the lowest concentration 220.6 ± 69.9 lg/m 3 was observed in the morning hours at UI. There was a significant difference between the PM 10 levels across the various locations (p \ 0.05), and all the levels were higher than WHO limit of 50 lg/m 3. The highest levels of Ni, Zn and Pb were recorded at BM, which also had the highest PM 10 burden. The trend in Pb levels across the locations was BM [ UI [ OP [ OE with the highest level 5.70 lg/m 3 in BM nearly fourfolds WHO limits of 1.5 lg/m 3. There was a significant correlation between PM 10 and Ni (p \ 0.05).Urban communities with increased human activities especially motor traffic recorded both higher levels of PM 10 and toxic trace metals. There is need to carry out source apportionment to establish the origin of these trace metals in future studies.
Arabian Journal of Geosciences, Aug 1, 2017
Fifty sediment samples were collected from Osun (urban) and Erinle (suburban) rivers in addition ... more Fifty sediment samples were collected from Osun (urban) and Erinle (suburban) rivers in addition to ten samples of the underlying rock types (schist and gneiss) and analyzed for elemental constituents while speciation of metals was determined by sequential analysis. Data were geochemically evaluated and ArcGIS was used to generate geochemical maps. Metal concentrations (ppm) in suburban and urban areas were Cd (
RMZ - materials and geoenvironment, Jul 26, 2023
The increased global demand for and price of rare earth elements (REEs) has led to intensive sear... more The increased global demand for and price of rare earth elements (REEs) has led to intensive search for them in rocks of the upper continental crust all over the world. This study is aimed at characterising the granitoids at Okeho within Southwestern Nigeria using geochemical data and assessing their potential for REE enrichment. Ten representative rock samples of the Proterozoic intrusives, syenite and granodiorite, were studied for their mineralogical and elemental compositions. Elemental concentrations were analysed using Inductively Coupled Plasma Mass Spectrometry (ICP-MS). Average major oxide concentrations revealed SiO 2 (57.53 wt. %), Al 2 O 3 (13.25 wt. %), CaO (5.05 wt. %), and MgO (5.59 wt. %) for the syenite and SiO 2 (62.39 wt. %), Al 2 O 3 (14.98 wt. %), CaO (3.67 wt. %), and MgO (3.25 wt. %) for the granodiorite. Total Alkali-Silica (TAS), Aluminum Saturation Index (ASI), and La/10-Y/15-Nb/8 plots discriminated the granitoids as metaluminous monzonite-syenite and peraluminous diorite-granodiorite. Average total REE concentrations in the syenite (625.06 ppm) and porphyritic-granodiorite (364.51 ppm) were above values reported for the granites in some mines in Jiangxi Province, Southern China.
Journal of African Earth Sciences, Mar 1, 2023
Environmental Geochemistry and Health, May 5, 2022
Ife Journal of Science, Jan 16, 2020
The nature of parentage of talc bodies from the northern part of Ilesha schist belt was investiga... more The nature of parentage of talc bodies from the northern part of Ilesha schist belt was investigated and compared with altered ultramafic-Komatiite. Observations from thin sections revealed altered serpentine with included nodular olivines. Talc, chlorite and tremolite were other minerals present. Geochemical analysis of five (5) rock samples taken from talc bodies outcropped from both sides of the Ifewara Shear Zone (ISZ) revealed magnesia (MgO) > 18% and Al O /TiO values ~ 40. MgO values ranged from 23.01-32.79 wt. %. Al O and 2 3 2 2 3 TiO values averaged 2.34 and 0.04wt. % respectively. Mg# values (87.93-90.71) supported ultramafic 2 precursor. Major oxide variation plots against magnesia revealed negative correlation in Al O TiO vs MgO. Co, 2 3, 2 V, Ni and Cu concentrations were significantly higher than the incompatible elements. Maximum Ni and Co values were 1765.10 ppm and 108.60 ppm respectively. The rare earth element (REE) concentrations showed relative enrichment in light rare earth element (LREE). The values of Gd/Yb(N) ranges from 0.94-1.86. The Gd/Yb(N) and Al O /TiO suggested that the precursor to the talc bodies were possible Gorgona group III 2 3 2 type komatiite. Plot of V vs Ti indicated an Island arc environment for the emplacement of these talc bodies.
WIT Transactions on Information and Communication Technologies, Jun 4, 2014
The negative consequence of industries in urban cities has become a major concern. Environmental ... more The negative consequence of industries in urban cities has become a major concern. Environmental risk assessment of heavy metals in the cement factories around Ewekoro environ was evaluated to deduce its risk on public health. Soil samples and consumable vegetables (Sugar-cane (Saccharumofficinarum), Soko (Celosia argentea), Cocoyam (Colocasiaesculerita) and Ewedu (Corchoruos olitorius) were collected 200m apart around the cement factory. Soil samples were dis-aggregated and sieved through a 65µ mesh sieve, then analyzed using inductively coupled plasma-emission spectrometry (ICP-ES), while plant samples were crushed and pulverized before being analysed using inductively coupled plasma-mass spectrometry (ICP-MS), all analyses were done at Acme laboratories Canada. Geochemical result of soils showed that most of the metals have values above the USEPA standard except Ni, V, Cr, and Ba, due to the effect of cement factory. Contamination factor and degree (C deg) revealed extreme contamination of Zn and Mn. Inter elemental analysis showed a strong correlation between Cr-As ('r' = 0.872) and Ga-v ('r' = 0.936), which reflects the same anthropogenic source. Geochemical results in vegetables revealed Zn to be the highest metal accumulated, and that which is most contaminated is Ewedu (Corchoruos olitorius). A strong and positive correlation was found in Ba-Sr, and Cd-Zn with r > 0.9 showing the same anthropogenic source.Transfer factor(TF) revealed accumulation of metals by the vegetables. Analysis of the health implications of these heavy metals was carried out in some clinics around the area and the common diseases recorded are the ones generally associated with cement dust inhaling. Soils and vegetables Risk Analysis IX 133
Environmental Geochemistry and Health, May 31, 2019
Lead (Pb) is of considerable concern among other heavy metals because of its toxic impact on the ... more Lead (Pb) is of considerable concern among other heavy metals because of its toxic impact on the environment and human health. The geochemical nature and source-transport-fate of Pb in Nigeria's environmental media are relatively unknown. This study was undertaken to quantify and characterize Pb in soils, sediments and road dusts from Lagos, Nigeria. A total of forty-eight soil samples, seventeen sediment samples and thirteen roadside soils were collected from within Lagos metropolis. The samples were air-dried, screened, pulverized and sieved through 63-lm nylon mesh. Mineralogical constituent of samples were determined using X-ray diffraction. The sieved fractions and pulverized rock samples were digested and analyzed for elemental Pb components using inductively coupled plasma mass spectrometry (ICP-MS). The chemical fractionations of Pb in the samples were determined by sequential analysis. Lead isotope compositions of the samples were determined using quadrupole-based ICP-MS. Lead isotopic ratios and geo-accumulation indexes were used for discriminating and evaluating Pb sources. Quartz, microcline, K-feldspar, plagioclase and kaolinite were the preponderant minerals in powdered rocks, soils and sediments. The concentration (mg/kg) of elemental Pb in sediments and dusts for Lagos was 21-1963; 23-830 and 22-830, respectively. The plots (208 Pb/ 207 Pb)/ (206 Pb/ 207 Pb) revealed that the Pb in the environmental media was derived from anthropogenic sources. The Pb isotopic ratios for soils, sediments and dusts were characterized by lower 208 Pb/ 206 Pb ratios, compared to bedrock. The Pb contents are held principally in the organic sulfide and reducible and carbonate phases. The Pb is held in very reactive geochemical phases, and these portend great risk to the environment and public health.
Discover Environment
The harmful health effect of suspended particulate matter (PM10) is mostly associated with its ma... more The harmful health effect of suspended particulate matter (PM10) is mostly associated with its mass concentrations and chemical compositions. Therefore, this study focuses on the determination of the particulate matter (PM10) concentrations and their potentially toxic elements (PTEs) composition from different road networks in Ibadan southwestern, Nigeria. In addition, human health risk assessment was estimated from the PTE data. The PM10 samples were collected from different road networks such as national highway roads (NHR), inner-city major roads (ICR), and remote roads (RRD) in Ibadan, Nigeria. The sampling was carried out with a high-volume air sampler (model #15000 manufactured by Science Resource, Walboro, USA) with a PM10 cut-off on a Whatman cellulose filter during the harmattan period. The PM10 concentrations and PTEs compositions (Al, Ba, Cd, Cu, Fe, La, Mo, Mn, Ni, Pb, V, and Zn) were determined by gravimetry and inductively coupled plasma-optical emission spectrometry (...
Journal of Trace Elements and Minerals
Tanzania Journal of Science, Oct 31, 2020
International Research Journal of Geology and Mining, 2016
Tourmaline is a common gem mineral found in association with beryl, topaz, garnet and kunzite alo... more Tourmaline is a common gem mineral found in association with beryl, topaz, garnet and kunzite alongside other rock-forming minerals like quartz, feldspar and muscovite in pegmatite across southwestern Nigeria. This study undertook a geochemical study of tourmalines from southwestern Nigeria with a view of ascertaining their origin and petrologic significance. Twenty-two (22) differently coloured tourmaline samples from different locations in southwestern Nigeria were prepared and analyzed using inductively coupled plasma-mass spectrometry (ICP-MS) to determine elemental constituents. The tourmalines are enriched in SiO2, with wide compositional variability in CaO, Al2O3, and FeO, with low contents of P2O5, TiO2, MgO and the alkalis. This wide variation in chemical compositions is believed to be a reflection of the systematic changes associated with the heterogeneity in compositions of their host rocks and mineralizing fluids brought about by the diversity in their geologic settings. The strong negative correlations observed between CaO and the oxides Al2O3, Na2O, K2O and SiO2 in the mineral samples clearly revealed features of magmatic deposits for the tourmalines, with their chemistry reflecting control by host mafic rocks and/or granitic-pegmatitic fluid. The tourmaline samples are extremely depleted in Heavy Rare Earth Elements (HREE) relative to Light Rare Earth Elements (LREE) suggesting that the crystallizing fluids are sourced from the upper continental crust rather than the mantle. The intensity of colouration in tourmaline is linked to the presence or otherwise of iron concentration.
Asia Pacific Journal of Energy and Environment, 2017
Tourmaline occurs in associations with other gem minerals such as beryl, topaz, garnet and kunzit... more Tourmaline occurs in associations with other gem minerals such as beryl, topaz, garnet and kunzite alongside rock-forming minerals like quartz, feldspar and muscovite in various gem mineral deposits across southwestern Nigeria. These occurrences of tourmaline in varieties of colors resulting from its range in chemical compositions remain puzzling, more so when there is a lack of sufficient information on the chemistry of the Nigerian tourmalines. This study is aimed at the major oxides investigation of tourmalines from selected gem-mineral deposits in southwestern Nigeria and how the chemistry can be used to infer their environment and processes of mineralization. A total of 22 differently colored tourmaline samples obtained from different locations in southwestern Nigeria were prepared and analyzed, using the inductively coupled plasma-mass spectrometry (ICP-MS) to determine the elemental constituents. Komu and Ijero-Ekiti, being the two areas with highest concentrations of the study samples were specially chosen and mapped, at least to reveal the geology of some gem mineral deposits in the area. Results of the geochemical analysis of the tourmaline samples showed enrichment in SiO2 and Al2O3, but depletion in the remaining major oxides. However, a few of the tourmaline samples showed unusual enrichment in CaO, revealing the fact that the samples have crystallized from highly fractionated melt. The major oxide compositions of the tourmalines exhibited wide and distinct variations, especially in SiO2, Al2O3 and CaO, indicating magmatic origin for the southwestern Nigerian tourmalines. Similarly, the strong negative correlations observed between CaO and the oxides Al2O3, Na2O, K2O and SiO2 in the tourmaline samples, coupled with the relatively high Fe/Fe+Mg ratio, averaging 0.89,clearly reinforced magmatic sourcing for the tourmalines. Almost all the southwestern tourmaline samples plot in the predefined field of Li-rich granitoidpegmatites and aplites in the Al-Fe-Mg and CaFe -Mg plots. Southwestern Nigerian tourmalines are thus magmatic in origin with their chemistry reflecting control by host rocks and granitic-pegmatitic fluid. The study also revealed that the intensity of coloration in tourmalines can be linked to the presence or otherwise of iron concentration. The iron content varies directly and proportionately with the depth of color in the greens, and inversely in the pinks and reds.
Journal of Environment and Earth Science, 2013
Arabian Journal of Geosciences, 2016
Your article is protected by copyright and all rights are held exclusively by Saudi Society for G... more Your article is protected by copyright and all rights are held exclusively by Saudi Society for Geosciences. This e-offprint is for personal use only and shall not be selfarchived in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version for posting on your own website. You may further deposit the accepted manuscript version in any repository, provided it is only made publicly available 12 months after official publication or later and provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be accompanied by the following text: "The final publication is available at link.springer.com".
Journal of Geoscience and Environment Protection, 2018
Talcose rocks from Itagunmodi and Igun areas within the Ilesa Schist Belt, southwestern Nigeria, ... more Talcose rocks from Itagunmodi and Igun areas within the Ilesa Schist Belt, southwestern Nigeria, were studied to determine their compositional affinities and industrial properties. The talcose bodies occurred as lensoid enclaves closely associated with amphibolites and quartz-mica schist. Petrographic and X-ray diffraction-aided mineralogical studies reveal that the talcose rocks are of the talc-chlorite schist variety composed predominantly of talc (average 73.63%), subordinate chlorite (average 16.08%) and accessory lizardite (average 6.5%). Total whole rock characterization of the samples using Lithium Fusion digestion revealed high mean concentrations of SiO 2 (57.53%), MgO (24.84%) and Fe 2 O 3 (7.73%) with significant enrichment of Ni, Co and Cr; and low values of Ba, Rb, Sr, V, Cu and Pb. The talc-chlorite schists plotted in the peridotitic komatiite field of the Al 2 O 3-(FeO + TiO 2)-MgO diagram. Water Absorption Capacity ranges from 6.25%-8.20%, Loss on Ignition is 4.8%-6.1% while Linear Shrinkage is 1.25%-1.70% and firing colour is brown to dark-brown. The overall compositional features of the talcose rocks of the area, which were hitherto uncharacterized, show their suitability as raw materials for paint, coloured pottery, ceramic insulation, textile, rubber and plastic manufacture with varying beneficiation requirements. Their high trace element content however, makes them unsuitable for use in pharmaceutical and cosmetic applications.
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Papers by Akinade Olatunji