African Journals Online
Bulletin of The Chemical Society of Ethiopia

ABSTRACTS Vol 14(1)

Bull. Chem. Soc. Ethiop. 2000, 14(1), 9-24. ISSN 1011-3294
Printed in Ethiopia 2000 Chemical Society of Ethiopia

A STUDY OF THE WATER QUALITY OF THE OSUN RIVER: METAL MONITORING AND GEOCHEMISTRY

A.A.^* Olajire and F.E. Imeokparia

Department of Pure and Applied Chemistry, Ladoke Akintola University of Technology, Ogbomoso, Nigeria

(Received October 27, 1999; revised March 24, 2000)

ABSTRACT. The concentrations and distributions of Cd, Cu, Ni, Pb, Cr and Zn in Osun river, selected rivers in the region and groundwaters have been studied, in order to establish the current levels of pollution. The metal concentration (mean±RSD in g dm^-3) in the Osun river for the sampling periods of May, June and August, respectively, were: Cd, 1.45±0.65, 1.40±0.37, 1.25±0.52; Ni,21.8±6.22, 10.6±3.68, 15.3±6.01; Pb, 7.16±3.30, 8.45±3.24, 4.86±1.98; Cu, 16.7±9.32, 11.9±4.81, 8.27±3.80; Cr, 250±118, 400±160, 150±72.9; Zn, 398±109, 289±113, 259±94.4. The correlation coefficient between metal pairs of river water and groundwater samples are calculated and possible sources of the polluting substances are discussed.

Bull. Chem. Soc. Ethiop. 2000, 14(1), 9-24. ISSN 1011-3294
Printed in Ethiopia 2000 Chemical Society of Ethiopia

SAMPLE CLEAN-UP, ENRICHMENT AND DETERMINATION OF S-TRIAZINE HERBICIDES FROM SOUTHERN ETHIOPIAN LAKESSUPPORTED LIQUID MEMBRANE EXTRACTION USING

Negussie Megersa^1,2, Theodros Solomon,¹ B.S. Chandravanshi¹ and Jan Åke Jönsson^2*

¹Department of Chemistry, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia

²Department of Analytical Chemistry, Lund University, Box 124, S-221 00, Lund, Sweden

(Received November 22, 1999; revised May 8, 2000)

ABSTRACT. The liquid membrane extraction method has been employed for selectively extracting trace quantities of s-triazine herbicides in environmental waters collected from lakes Awassa, Cham