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Bulletin of The Chemical Society of Ethiopia

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Volume 15, Number 2, December 2001
Abstracts

 

AUTOMATION OF POTENTIOMETRIC TITRATION WITH A PERSONAL COMPUTER USING AN IBM COMPATIBLE INTERFACE SYSTEM

Mulugeta Desta*
Department of Chemistry, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia
(Received October 13, 2001; revised December 22, 2001)

ABSTRACT. An IBM compatible interface card system with infrared source-detector data sampling was designed and tested for automation of potentiometric titrations with personal computers without continuous measurement of the volume of the titrant. The device with other appropriate apparatus and setup was tested for determination of iron(II) samples with potassium dichromate. The automation method developed was tested to the titration of 1.500 x 10-4 M iron(II) sample and gives a reliable result of 1.496 x 10-4 M iron(II) with a relative error of 1.76%.

 

 

AMBIENT AIR PARTICULATE MATTER IN LAGOS, NIGERIA: A STUDY USING RECEPTOR MODELING WITH X-RAY FLOURESCENCE ANALYSIS

E.A. Oluyemi* and O.I. Asubiojo
Department of Chemistry, Obafemi Awolowo University, P.M.B. 013, Ile-Ife, Nigeria
(Received January 17, 2001; revised August 22, 2001)

ABSTRACT. The need for comprehensive air pollution studies in Lagos cannot be overemphasized in view of the level of industrialization of the city and its nearness to the ocean. Air particulate samples collected with a high-volume air sampler at three locations in Lagos, Nigeria were analyzed by the combination of wavelength-dispersive X-ray fluorescence and atomic absorption spectroscopy methods. Elemental concentrations were subjected to factor analysis for source identification and chemical mass balance model was used for source apportionment. Prominent among sources identified with the ranges of their contributions at the sites are: soil 35-54%, marine 26-34%, automobile exhaust 0.3-3.5%, refuse incineration 2-3%, and regional sulphate 2-12%.

 

ATMOSPHERIC POLLUTION IN NORTH-EAST NIGERIA: MEASUREMENT AND ANALYSIS OF SUSPENDED PARTICULATE MATTER

V.O. Ogugbuaja* and L.Z. Barsisa
Department of Chemistry, Faculty of Science, University of Maiduguri, P.M.B. 1069, Maidugu