Separating ion-exchange resin from soil
1991
Thien, S.J. | Myers, R.
Use of ion-exchange resins in soil science lacks a suitable technique for separating loose resin from soil. Implanting porous, resin-filled bags has been used, but limits soil-resin contact. Grinding soil fine enough to sieve the resin may not be appropriate for some applications. We have developed a technique for separating loose resin from soil. A 1.31 M sucrose solution was added to a soil-resin mixture and centrifuged 3 min at 1900 X g. Density differences caused the soil (2.65 kg m-3), sucrose solution (1.17 kg m-3), and exchange resin (1.12 kg m-3) to separate. The resin accumulated on top where it could easily be recovered by decanting for further analysis. Average recovery of resin was 99.0% from eight different soils. Resin added and resin recovered were highly correlated (r = 0.99) and were independent of soil/resin ratio. The use of sucrose, a nonionic solution, had so effect on resin composition in this procedure.
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