Potassium graphite columns

Muzzarelli and Sipos [622] showed that a column of chitosan (15 x 10 mm) can be used to concentrate zinc from 3 litres of seawater before determination by anodic-stripping voltammetry with a composite mercury-graphite electrode. Zinc (and lead) are eluted from the column by 2 M ammonium acetate (50 ml), copper by 0.01 M EDTA (10 ml), and cadmium by 0.1 M potassium cyanide (3 ml). 

Figure 7.16 Separation of prodrug isomers on porous graphitic carbon [reproduced with permission from C. Bell, E.W. Tsai, D.P. Ip and D.J. Mathre, J. Chromatogr. A, 675, 248 (1994)]. Conditions column, 10cm x 4.6 mm i.d. stationary phase. Hypercarb, 5 a.m mobile phase, 1.5 ml min 0.02 M potassium phosphate pH 6.8/acetonitrile (55 45) UV detector, 220 nm.

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