Motor Vehicle Accident Fatalities for the Week Ending, August 25, 2006

Record of the Fatalities for Motor Vehicle Accidents in Iowa per week.

EPI Update, August 25, 2006

Weekly newsletter for Center For Acute Disease Epidemiology of Iowa Department of Public Health.

Kaanaassa 28/5 -25

Kirje 28.5.1925

Arsenic(V) adsorption onto α-Al2O3 between 25 and 70°C

The adsorption of As(V) onto alpha -Al2O3 was investigated at 25, 50 and 70 degreesC using batch adsorption experiments. Results indicate that As is strongly adsorbed at low pH and gets progressively released to the fluid with increasing pH above 7. At any pH, increasing temperature favors aqueous species of As over surface species. Surface complexation constants were determined at the experimental temperatures by fitting the adsorption data. Adsorption reactions were then converted to semi-isocolumbic reactions, i.e, reactions with balanced like-charged aqueous species. Intrinsic adsorption constants of semi-isocolumbic reactions change linearly when plotted against inverse temperature, suggesting that the heat capacity of these reactions remains constant over the temperature range considered. This permitted thermodynamic parameters of intrinsic surface complexation constants to be determined. Changes in surface complexation constants result in a change in the surface speciation with increasing temperature. This change is similar to the one observed for aqueous species, i.e. increasing temperature favors less negatively charged species below a pH of 9 and more negatively charged species above a pH of 10. Comparison with the stability of As surface complexes with Fe suggests that surface complexes with Al are more stable. (C) 2001 Elsevier Science Ltd. All rights reserved.

Nuori Neiti Kati Myllymäki 25/1 1973

Kirje 25.1.1973

Lottery Action Newsletter, September 25-October 8, 2006, Vol. 13, no. 18

Iowa Lottery Retailer Newsletter

ABD e-News, November 25, 2006

Weekly Newsletter