December 2011

Influence of pH on the uptake of toluene from water by the composite poly (4-vinylpyridinium)-maghnite

The objective of this study is to investigate the effects of the degree of α ionization on the rate uptake of organic pollutant (toluene) by poly (4-vinylpyridinium)-maghnite. Two-step experiment was carried out where the organophilic maghnite adsorbent was prepared in the first step and toluene was adsorbed on maghnite in the second step. This material organophilic maghnite was prepared by exchanging the organic...

Author(s): M. A. Zenasni, S. Benfarhi, A. Mansri, H. Benmehdi, B. Meroufel, J. Desbrieres and R. Dedriveres

December 2011

Spectrophotometric determination of cobalt (ii) in low concentrations using hydroxytriazene as selective chelating agents

The present work describes a selective, rapid and simple spectrophotometric method for the determination of cobalt (II) at trace levels using some selected hydroxytriazene. The method is based on the reaction of hydroxytriazene at pH 5.5 to 6.2, 6.0 to 6.8, 7.1 to 7.35, 7.3 to 7.9, 6.75 to 7.25 and 7.2 to 7.75 for hydroxytriazenes no (i), (ii), (iii), (iv), (v) and (vi) respectively and ethanol media with cobalt (II) to...

Author(s): Ombaka O. and Gichumbi J. M.