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A solid-phase extraction method using Transcarpathian clinoptilolite for preconcentration of trace amounts of terbium in water samples

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Figure

Fig. 1 Dependence of clinoptilolite sorption capacity of terbium(III) ions on a pH value of the aqueous solution and thermal treatment carried out inthe range from 20 to 700 °C (pH 8.25) (concentration of Tb(III) – 1 μg•mL−1; pH 8.25; a flow rate −3 mL•min−1; time of heat treatment – 2.5 h)
Fig. 2 TG and DTG-curves of natural clinoptilolite (1, 1*) and clinoptiloliteheated at 500 °С (2, 2*)
Table 2 Tolerance limits of some ions for terbium(III) sorptionfrom aqueous solution of Transcarpathian clinoptilolite(concentration of Tb(III) – 1 μg∙mL−1; pH 8.25)
Table 4 Determination of terbium(III) ions in the synthetic water sample with the composition similar to natural surface waters afterions preconcentration with clinoptilolite (n = 3, P = 0.95)

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