Ion exchange of zinc on an aminophosphonate-chelating resin

✍ Scribed by Jukka Lehto; Kaisa Vaaramaa; Heikki Leinonen

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 565 KB
• Volume: 33
• Category: Article
• ISSN: 1381-5148
• DOI: 10.1016/s1381-5148(97)00002-3

✦ Synopsis

The distribution coefficient (Ko) of trace zinc in 1 M NaCl solution on an aminophosphonate-chelating resin Duolite C467 increased with pH to a peak value close to 200000 ml/g at pH about 6. At higher pH values the KD dropped to 25 000 ml/g due to competition of zinc hydrolysis. Increasing NaCl concentration up to about 1 M improved zinc uptake on sodium-form Duolite C467 since it prevented exchanger hydrolysis, but at higher concentrations K. decreased somewhat due to Zn*+/Na+ competition. Also, increasing zinc concentration, from 6 x lo-' M to 1 mM, improved zinc uptake, since the exchanger is less hydrolysable in zinc form. EDTA interfered strongly with z&c uptake when present at concentrations higher than 1 FM, sodium cyanide at concentration higher than 1 mM, citrate in concentrations higher than 10 mM while gluconate did not interfere at all.