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. IQBAL. Can. J. Chem. 71, 629 (1993). Cu(I1) -Schiff base complexes containing anthranilic acid and aldoses (sugars) as part of the base were prepared and characterized by microanalytical, thermogravimetric, magnetic, and spectroscopic data. The complexes are four-coordinate, anhydrous, and ML, type. The electron paramagnetic resonance spectral lines exhibited rhombic distortion from axial symmetry in the square-planar Cu(I1) complexes with gl i > gl > g,. The complexes were found to be active against kaolin paw oedema and standard strains of Escherichia coli, Staphylococcus aureus, and Pseudornonas aeruginosa. [Traduit par la redaction]

The sorption behavior of Sn(II) onto Haro river sand has been examined with respect to nature of electrolyte, agitation time, dosage of sorbent and concentration of sorbate, Maximum sorption (95.5%) has been achieved from 0.034M hydrochloric acid solution after equilibrating sorbate (2.10-SM) and sorbent (50 mg) for 120 minutes at a V/W ratio of 90 cm3.g a. The kinetic data have been subjected to Morris-Weber and Lagergren equations. The kinetics of sorption proceeds a two stage process consisting of a relatively slow initial uptake followed by a much rapid increase in the sorption. The rate constant of intraparticle transport, Kd, comes out to be 8.75.10 -8 mol.g-kmin -m and the first order rate constant for sorption is 0.0416 min-l.The sorption data of Sn(II) onto Haro river sand followed Langmuir, Freundlich and Dubinin-Radushkevich (D-R) type isotherms. The Langmuir constant, Q, related to sorption capacity and, b, related to sorption energy are computed to be 10.6_+1.1 gmol.g -l and 1123+137 dm3-mo1-1, respectively. The D-R isotherm yields the values of C m = 348+151 gmol.g -1 and 13 =-0.01044+0.0008 molZ.kJ 2 and of E= 6.9_+0.3 kJ.mol -I. In all three isotherms correlation factor (T) is >0.99. The influence of common anions and cations on the sorption has been investigated. Zn(II), Mg(lI), oxalate, Pb(II), Mn(II) and tartrate reduce the sorption significantly whereas Fe(II) causes substantial increase in the sorption. It is essential that all ions causing a decrease in the sorption of Sn(II) must be absent from the sorptive solution otherwise low sorption yields would result.

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