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    Wyświetlanie 1-5 z 5
    Tytuł:
    Risk associated with heavy metals in children playground soils of Owerri metropolis, Imo State, Nigeria
    Autorzy:
    Wirnkor, Verla Andrew
    Evelyn Ngozi, Verla Evelyn
    Powiązania:
    https://bibliotekanauki.pl/articles/1118068.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Bioconcentration
    Metal fractions
    Models
    Predictive
    Risk
    Opis:
    Despite recording the worst heavy metal disaster involving children, there is still scarcity of information on risk assessment of playground soils in Nigeria. In this study, thirty-six soil samples at 0-5 cm depth were collected from nine playgrounds in Owerri metropolis during the dry and rainy seasons. Five heavy metals were fractionated into six chemical fractions using a modified sequential extraction scheme and mean concentrations quantified by AAnalyst 400 Perkin Elmer AAS. Predictive risk models were used to obtain information about the risk of metals contamination to children using these playgrounds for longer periods. These reveal that there were no significant differences in the mean values of bioconcentration factors of all five metals in the various playgrounds for the two years of data. Even though risk values for both dry and rainy season followed the same trend, it was observed that the Zinc showed highest bioconcentration factors (1.6), average daily dose (230.08 mg/kg/day) and risk (5095593 mg/kg/6years). Over all, playgrounds UPS, TSO and SCP had highest mean risk values, respectively. Though with no clear trend, mobility factors showed a weak and positive correlation with risk. Children in playgrounds of public schools within Owerri metropolis could, therefore, be at risk of Mn, Cu and Zn toxicity problems as projected risk values were high for all studied playgrounds. This assessment could help identify playgrounds with urgent need for heavy metals reduction goals, consequently contributing to preserving children’s health.
    Źródło:
    World News of Natural Sciences; 2017, 10; 49-69
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Uptake of Microplastics by Plant: a Reason to Worry or to be Happy?
    Autorzy:
    Ebere, Enyoh Christian
    Wirnkor, Verla Andrew
    Ngozi, Verla Evelyn
    Powiązania:
    https://bibliotekanauki.pl/articles/1066238.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Agricultural soil
    Food
    Human health
    Microplastic
    Phytoremediation
    Plant
    Toxicity
    Opis:
    Microplastic (MP, 1 μm − 5 mm) pollution has become a global environmental concern with potential risk to ecosystem and human health. Information on the accumulation of MPs in aquatic species has been well documented, while information on the uptake and accumulation of MPs by higher plants is still very scarce. Terrestrial edible plants are directly exposed to MPs when soil was applied with sludge, organic fertilizer, plastic mulching, waste water irrigation, plastic littering, surface runoff or from atmospheric deposition of airborne MP. One study using fluorescent marker recently showed that plant can accumulate MP through uptake from MP polluted soil. Thus, potentially contaminating the base of the food-web and also indicating new exposure route to MP ingestion. This review present a discuss of the implication of these findings to human, who may be ingesting an estimated 80 g of MP through eating of plant daily as global consumption rate of plant continually increase. Also, benefit for the terrestrial ecosystem is discussed, by which plant acts as a potential remediator of MP polluted soil either by phytoextraction, phytostabilization and phytofilteration. We conclude by pointing knowledge gap and suggesting key future areas of research for scientists and policymakers.
    Źródło:
    World Scientific News; 2019, 131; 256-267
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiation levels of dumpsites within Imo State University, Owerri, Imo State, Nigeria
    Autorzy:
    Wirnkor, Verla Andrew
    Ebere, Enyoh Christian
    Chukwunonso, Okonkwo Felix
    Ngozi, Verla Evelyn
    Powiązania:
    https://bibliotekanauki.pl/articles/1114110.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Environmental monitoring
    Ionizing
    Public health
    waste
    Opis:
    With increasing population and human activities, dumpsites experience diverse sources of waste with potential radiation hazards. Ionizing radiations have often been overlooked amongst researchers in third world countries, hence, information in this regard is lacking. In this study, nine dumpsites within Imo State University (IMSU) grounds were assessed for radiation levels using Geiger Muller counter Tube Mullard type ZP 1481 with assisted scalar and stopwatch. After calibration, the instrument was placed one meter above ground level and count rates recorded at 10 minutes interval for each location once in the morning, the afternoon and the evening for seven days. Results reveal higher dose equivalents in some morning periods than in the afternoon and evening. Site ETF2 had highest value of 0.69±0.08 mSv·yr-1, while Extension gate had lowest value of 0.56±0.01 mSv·yr-1. Compared to National Council for Radiation Protection maximum permissible level, these values are quite low. In conclusion, ionizing radiations levels at the studied dumpsites in Imo State University grounds are low and may not pose a threat to persons within the university.
    Źródło:
    World News of Natural Sciences; 2017, 11; 45-64
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Water Quality Index and Human Health Risk Assessment of Class B Swimming Pools in Owerri Municipal, Nigeria
    Autorzy:
    Ngozi, Verla Evelyn
    Nwachukwu, Joseph Ikechukwu
    Lydia, Ugwoke Chidera
    Wirnkor, Verla Andrew
    Powiązania:
    https://bibliotekanauki.pl/articles/1839872.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Contaminants
    Model
    Index
    Permissible limit
    Physicochemical
    Opis:
    Assessments of public swimming pools in Owerri municipal, Imo state, Nigeria was carried out for the purpose of determining the suitability of water for swimming in this fun loving town of Nigeria. Five public pools were selected by purposive sampling from more than 30 pools in the area. Water samples were collected in the morning and evening from pools and analyzed in triplicates for physicochemical properties and heavy metals content by using standard method for water analysis and Atomic Absorption Spectrometer. Data obtained were compared with WHO and EPA standards for drinking and recreational water and modeled on the Water Quality Index (WQI). Results revealed that pH ranged from 7.10±0.02 to 8.1±1.27 pH units, EC ranged from 40 ±3.11 µS/cm to 80±3.44 µS/cm, COD value ranged from 0.08±0.07 to 1.02 ±0.91, BOD value ranged from 0.03±0.02 to 3.14±0.13, dissolved oxygen (DO) ranged 3.9±1.77 mg/kg to 9.3±2.41 mg/kg, suspended solids ranged from 6.43±8.21 mg/l to 42.44±7.00 mg/l, total dissolved solids (TDS) ranged from 22±2.90 mg/l to 97.98±8.79 mg/l. The major cations were below the standard. Nitrate ranged from 0.91±0.02 mg/l to 0.96 mg/l, sulphate ranged from 2.34±0.10 mg/l to 2.81±0.11mg/l, phosphate ranged from 0.34±0.02 mg/l to 0.65±0.02 mg/l while chloride ranged from 12.75±1.89 mg/l to 31.89±2.04 mg/l with mean 24.23 mg/l. Except for chloride, all other studied anions were lower than the permissible limit set by WHO/EPA. Concentration of lead (Pb), iron (Fe), Copper (Cu) were also below the permissible limit. The individual WQ indexes showed A (3.32), B (5.44), C (10.08), D (12.40) and E (9.77) with average WQI of 8.20 suggesting that the swimming pools are of “Excellent water quality”, thereby suggesting safe swimming pools for recreational activities in the study area. Values of exposure pathways for all metals at all swimming pools were less than one. Therefore there were no risks of heavy metals from the swimming pools.
    Źródło:
    World News of Natural Sciences; 2021, 38; 60-82
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pollution assessment models of surface soils in Port Harcourt city, Rivers State, Nigeria
    Autorzy:
    Verla, Evelyn Ngozi
    Verla, Andrew Wirnkor
    Enyoh, Christian Ebere
    Powiązania:
    https://bibliotekanauki.pl/articles/1113910.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Anthropogenic
    Contamination
    Pollution indices
    Residential area
    Opis:
    Environmental pollution has resulted in several health and physiological problems in both plants and animals. This has witnessed growing number of models for assessment purposes. Some of these provide useful information, and reduce large data for easier understanding by policy-makers. In the current study of pollution, we used data from four locations: Oil Market, Trans Amadi, Borrokiri and GRA in Port Harcourt and a control taken from Federal Land Resource Umuahia (FLRU). A total of 25 composite soil samples were analyzed for physicochemical parameters and heavy metals, by means of a 969 Unicam AAS model series. The data obtained were then subjected to index models. Results showed iron (Fe) to be most abundant metal, ranging from 10.44 to 19.54 mg/kg, then Ni (8.03 to 13.6mg/kg), Cd (3.96 to 5.41 mg/kg), Pb (1.36 to 7.64 mg/kg), Zn (0.09 to 7.24 mg/kg), Cu (0.16 to 0.32) and As (0.07 to 0.11 mg/kg). All metal concentrations were below permissible limits set by NESRA. Contamination factor (Cf) and Igeo revealed moderate to heavy contamination by Cd and Zn. Anthropogenicity revealed that increasing metals in the environment are largely from anthropogenic inputs. The Pollution Index revealed that soils were unpolluted (PLI < 1) with the heavy metals. Furthermore, the Sodium absorption ratio showed that the soils are less sodic and could be good soils for plant growth. All four sites showed a linear relationship between anthropogenicity and geoaccumulation indexes, and so both indexes furnish basically the same information However, pollution from these metals in the study area should be under routine check for possible pollution in the near future, as some metals showed elevated concentrations above background values.
    Źródło:
    World News of Natural Sciences; 2017, 12; 1-20
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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