Multi-element extractors were prepared by encasing cation and anion exchange resin beads in dialysis tubing. Extractors were inserted in soil suspensions, equilibrated for 168 h and eluted with 0.1 M HNO 3 . Eluted volumes were adjusted to 1.2 M in HCl, diluted to volume and directly analyzed using ICP methods.
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Olness et al. (1994) studied this question.
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