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  1. Article ; Online: Editorial

    Dong-Xing Guan / Chunguang Yang / Jerome O. Nriagu

    Frontiers in Public Health, Vol

    The role of essential trace elements in health and disease

    2024  Volume 11

    Keywords essential trace elements ; human health ; metabolic diseases ; maternal and perinatal health ; human cancers ; public health ; Public aspects of medicine ; RA1-1270
    Language English
    Publishing date 2024-01-01T00:00:00Z
    Publisher Frontiers Media S.A.
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article: Elevated prenatal methylmercury exposure in Nigeria: Evidence from maternal and cord blood

    Obi, Ejeatuluchukwu / Charles Okafor / Anthony Igwebe / Joy Ebenebe / Onyenmechi Johnson Afonne / Francis Ifediata / Orish Ebere Orisakwe / Jerome O. Nriagu / Niladri Basu

    Chemosphere. 2015 Jan., v. 119

    2015  

    Abstract: Methylmercury is a neurodevelopmental toxicant that is globally distributed though little is known about prenatal exposures in sub-Saharan Africa. The objective of the current study was to measure total mercury levels in cord blood and maternal blood ... ...

    Abstract Methylmercury is a neurodevelopmental toxicant that is globally distributed though little is known about prenatal exposures in sub-Saharan Africa. The objective of the current study was to measure total mercury levels in cord blood and maternal blood from 95 mother-newborn pairs recruited from hospitals in Nnewi, Nigeria. The secondary aims of the study were to explore if demographic and dietary factors were associated with blood mercury levels, and to explore if mercury levels were associated with any self-reported health outcome and childbirth outcome. Maternal blood mercury levels averaged 3.6μgL−1 and ranged from 1.1μgL−1 to 9.5μgL−1. Cord blood mercury averaged 5.1μgL−1 and ranged from 1.2μgL−1 to 10.6μgL−1. The mean ratio of mercury in paired cord blood to maternal blood was 1.5 and it ranged from 0.4 to 3.2. Mercury in maternal and cord blood were significantly correlated (r=0.471). More than one-third of mothers reported eating fish at least once per day, and a weak (p=0.08) fish consumption-related increase in blood mercury was found. Cord blood mercury was positively and significantly associated with birth weight and length, and head and chest circumference. Mercury levels in 36% of the participants exceeded the biomonitoring guideline associated with the United States Environmental Protection Agency (U.S. EPA) reference dose for mercury. The study shows that pregnant women and their newborns are exposed to methylmercury and that their exposures are higher compared to general populations sampled from other regions of the world.
    Keywords United States Environmental Protection Agency ; birth weight ; blood ; chest ; childbirth ; diet ; fish ; guidelines ; head ; hospitals ; ingestion ; mercury ; methylmercury compounds ; mothers ; neonates ; pregnant women ; Nigeria
    Language English
    Dates of publication 2015-01
    Size p. 485-489.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2014.07.038
    Database NAL-Catalogue (AGRICOLA)

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  3. Article ; Online: Role of sediment porewater in the cycling of arsenic in a mine-polluted lake

    Jose M. Azcue / Jerome O. Nriagu / Sherry Schiff

    Environment International, Vol 20, Iss 4, Pp 517-

    1994  Volume 527

    Abstract: The surficial sediments of Moira Lake average 545 μg.g−1 of arsenic, with maximum values close to 1 mg.g−1 at depths of 23–27 cm below the sediment water interface. The sediment porewater is the linking agent between the sediment solid phase and the ... ...

    Abstract The surficial sediments of Moira Lake average 545 μg.g−1 of arsenic, with maximum values close to 1 mg.g−1 at depths of 23–27 cm below the sediment water interface. The sediment porewater is the linking agent between the sediment solid phase and the overlying lake water. The depth distributions of total As in interstitial waters at all stations are characterized by subsurface maxima, with concentrations four to six times greater than in the lake wates. In all the porewater profiles examined, inorganic As [As(III)+As(V)] comprised most of the As. The As(III) (arsenite) percentage ranged from 66–83%. Methylated-As compounds represented <2% of the total As. The strong correlation of As with Fe and Mn together suggests that both Fe and Mn are involved in the As mobility. The elevated As concentrations in bottom sediments represent a continuous internal mining of As towards the interface all year around. The concentration gradient of total dissolved As indicates that an upward diffusion of As towards the water column with the estimated annual fluxes being 0.8–3.8 μg.cm−2.y−1.
    Keywords Environmental sciences ; GE1-350
    Subject code 333 ; 550
    Language English
    Publishing date 1994-01-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Arsenic forms in mine-polluted sediments of Moira Lake, Ontario

    JoséM. Azcue / Jerome O. Nriagu

    Environment International, Vol 19, Iss 4, Pp 405-

    1993  Volume 415

    Abstract: The sediments of Moira Lake, Ontario, have accumulated large quantities of arsenic and toxic metals since the 1830's when mining began in its drainage basin. Despite the fact that the mine activities ceased in 1961, leachates from the abandoned mine ... ...

    Abstract The sediments of Moira Lake, Ontario, have accumulated large quantities of arsenic and toxic metals since the 1830's when mining began in its drainage basin. Despite the fact that the mine activities ceased in 1961, leachates from the abandoned mine wastes still deliver large quantities (about 3.5 Mg.y−1) of arsenic to the lake. The As concentrations at the top of the sediments average about 545 μg.g−1, with maximal concentrations of about 1000 μg.g−1 occurring at depths of 23–27 cm. Approximately 56% of the As in the sediments is bound to the iron and manganese oxides. Observed changes in the profiles of As bound to the different chemical fractions suggest that some of the oxide-bound As is being converted to the residual phases. In view of the dominant form of As in the sediments, changes in the Eh or pH may trigger the release of large quantities of As to the overlying water.
    Keywords Environmental sciences ; GE1-350
    Language English
    Publishing date 1993-01-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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