[Improvement of prediction model of retention values of anions with sodium carbonate-sodium bicarbonate as eluents].
A prediction model of retention values of anions with sodium carbonate-sodium bicarbonate as eluents has been improved. The improved model is suitable for a wider range of concentrations of sodium carbonate-sodium bicarbonate eluents than the old one set up several years ago. An extensive set of experimental retention data obtained for 7 anions (nitrate, sulfate, oxalate, selenate, iodide, phosphate and arsenate ) using the eluents of varied concentrations was dealt by binary linear regression process. The improved model gave satisfactory performance with correlation coefficients over 0.999 for nitrate, sulfate, oxalate, selenate and iodide, of 0.9971 for phosphate, and of 0.995 7 for arsenate. A computer program has been designed with the prediction model to simulate the separation of anions and used to optimize the routine analysis with sodium carbonate-sodium bicarbonate as the eluent.
Fu
Hou-Tun
HT
College of Chemistry and Environmental Engineering, Jianghan University, Wuhan 430010, China. fuhoutun@sohu.com