Potassium Ion ExchangerFeatures 1. 0 mL Liquid Ion Exchanger Instruction Manual ION H+ K+ Ca++ CATALOG NO. IE010 IE190 IE200 SELECTIVITY COEFFICIENTS* Na+ 12. 7 1. 97 5. 5 Mg++ 2. 95 4. 9 K+ 5. 4 Ca++ 2. 7 USEFUL pH RANGE 2 10 4 10 4 10 SLOPE 56 mV 58 mV 28 mV LINEAR RANGE pH 4 12 pK 0 3 pCa 1 7 APPROX. EQUIV. Corning 477317 ETH1001 *Selectivity Coefficients are expressed here as log Kij or pKij. M. R. Rheault, M. J. O'Donnell "Organic cation transport by Malpighian tubules