Elemental analysis of sewage effluents in Kibabii sewage treatment system\nwas achieved via Energy-Dispersive X-Ray Fluorescence (EDXRF) spectroscopy\nwith the aim of assessing the efficacy of the treatment system. Concentrations\nof lead (Pb), mercury (Hg), cadmium (Cd) and arsenic (As) were\nmeasured based on clay soil â??standardsâ? in concentration range for Pb, Hg\nand As as 12.7 ppm, 14.3 ppm and 8.83 ppm respectively for certification.\nAmong other probable reference materials, clay soil â??standardsâ? were used\nfor certification in this work because of similarity in matrix composition with\nthe sediments. The concentration for Hg, Pb, and As in the sewage sediments\nwere.............
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