Sorption of Pb 2+ , Cd 2+ and Cr 2+ in aqueous solution using immobilized Cissus populnea stem bark powder as a bio-sorbent was studied. The maximum sorption capacity of ICPSB on Pb 2+ , Co 2+ and Cr 2+ are 94.20%, 88.19% and 78.97% respectively. Effect of concentration on the sorption capacity of ICPSB shows that sorption capacity increase with increase in concentration while effect of ionic strength curve shows that sorption capacity decrease with increase in ionic strength. Effect of time on sorption capacity of ICPSB was observed between 1-24 hours, it was observed that Pb 2+ recorded the maximum sorption compared with Co 2+ and Cr 2+ . Effect of pH was studied at pH range of 1.0-8.0. Optimal sorption was recorded at pH 8.0 for Pb 2+ . The result of this research has added to the use of a cheaper bio-sorbent i.e. immobilised Cissus populnea stem bark (ICPSB) for sorption of Pb 2+ , Co 2+ and Cr 2+ .
The present study was designed to investigate the free radical scavenging activity and phytochemical composition of ethylacetate fraction (EtyAc) of stem bark of Lannea acida. The free radical scavenging activity was tested using 2,2-diphenyl-1-picrylhydrazyl (DPPH) and by determination of total phenolic composition. Preliminary phytochemical screening was carried out using standard methods. The EtyAc fraction demonstrated significant scavenging activity, contained appreciable amounts of total phenolics and a number of secondary plant metabolites including, flavonoids, alkaloids, tannins and saponins. The study revealed that EtyAc fraction of stem bark of Lannea acida possesses significant antioxidant activity.
This study investigates the presence of cadmium in eight Nigerian food samples from Oja Oba, Ojuwoye and Kuto markets in Kwara, Lagos and Ogun State respectively. The food samples were analyzed using atomic absorption spectrometer. The results obtained revealed that cadmium was present in all the food samples that were analyzed at different concentration ranging from 0.001 ppm to 0.007 ppm. The results showed a permissive concentration of cadmium in the food samples as compared to FAO/WHO Expert Committee on food additives (EFSA, 2012) weekly limit of 2.5 µg/kg body weight. Since trace amount of cadmium is expected in almost all food samples due to natural conditions, it is necessary to pay close attention to cadmium contamination in food samples as continuous intake of food containing cadmium is dangerous to health.
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