苏州男士工作室

first_imgAerosol samples were collected at a remote site near the east coast of the Antarctic Peninsula during the austral summer of 1984/85. Filter samples were analyzed for Al (as a crustal reference element), marine cations (Na, K, and Ca), heavy metals (Cd, Cu, Pb, and Zn), and sulphate using atomic absorption spectrometry, isotope dilution mass spectrometry, neutron activation analysis, and ion chromatography. Ultraclean sample collection and analysis procedures used to avoid sample contamination are described in detail here. Mean concentrations of heavy metals were found to be: Cd, 0.06 pg m−3; Cu, 1.0 pg m−3; Pb, 4.7 pg m−3, and Zn, 6.1 pg m−3. These are the lowest concentrations yet determined in the troposphere, but for Pb and Zn they still indicate a significant enrichment over expected crustal concentrations. For these elements, estimated marine and volcanic contributions cannot account for this excess and suggest pollution as the dominant source even at this remote location. For Cd and Cu a dominant anthropogenic source cannot be ruled out, although current estimates of crustal, marine, and volcanic emissions could account for levels determined.last_img read more

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first_imgFormer Leventis United Chief Coach, Emmanuel Okoh, 65, died in Lagos on Tuesday.According to a press statement endorsed on behalf of the family by Charles Okoh, news editor of Champion Newspapers Limited, the coach died in the early hours of yesterday after a protracted illness in a Lagos hospital.An ex-footballer, Okoh, in his playing days captained Leventis Football Club (Iddo Tigers) in Lagos before being made coach of the Ibadan-based all-conquering Leventis United.Coach Okoh was voted the best coach in the country when he led the Leventis United to the finals of the African Cup Winners Cup.He also coached Calabar Rovers, Delta Steel FC, Aladja as well as Union Bank of Lagos, before quitting coaching to venture into other business endeavours.Share this:FacebookRedditTwitterPrintPinterestEmailWhatsAppSkypeLinkedInTumblrPocketTelegramlast_img read more