Equilibrium and thermodynamic analysis of zinc ions adsorption by olive oil mill solid residues.

This work investigated the equilibrium batch dynamics of using olive oil mill solid residues as an adsorbent for zinc removal from aqueous solutions. It was found that a sorbent concentration of 4 g L(-1) achieved the best removal percentage and the best sorbent capacity. Adsorption equilibrium was reached in 60 min for an initial zinc concentration of 0.25 mmol/L and 180 min for an initial zinc concentration of 1-3 mmol/L. A particle size of olive mill residue ranging from 0.85 to 1.18 mm was used in the study. It was found that the maximum adsorption capacity of zinc was at a pH value of 5.0. It was found that q(max) for zinc ions, was 5.63, 6.46, and 7.11 mg g(-1) at temperature values of 298, 308, and 328 K, respectively. The data pertaining to the sorption dependence upon metal ion concentration could be fitted to a Langmuir isotherm model. The second-order kinetic model provided the best correlation of the data. The change in entropy (DeltaS degrees ) and heat of adsorption (DeltaH degrees ) for zinc ions adsorption on olive mill solid residues were estimated as -1419 kJ kg(-1)K(-1) and 4.7 kJ kg(-1), respectively. The examined low-cost adsorbent could offer an effective way to decrease zinc ions concentration in wastewater.

Prevalence and predictors of non-fatal myocardial infarction in Jordan

This study in May 2002, part of the Jordan Department of Statistics national crosssectional, multistage employment and unemployment survey, measured the prevalence of selfreported myocardial infarction [MI] and the association with modifiable risk factors among Jordanians aged 40+ years. Of 3083 participants, 183 [5.9%] had ever been told by a doctor that they had had a MI. The prevalence varied by age and sex; 128 [69.9%] of the cases were in men. Among males and females, self-reported hypertension and hypercholesterolaemia were significantly associated with MI and diabetes was a significant risk factor for women. There was a significant relationship between current smoking and MI but not with previous smoking. Exercise and body mass index were not statistically significant predictors of MI in both males and females