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Table 4 Determination of terbium(III) ions in the synthetic water sample with the composition similar to natural surface waters after ions preconcentration with clinoptilolite (n = 3, P = 0.95)

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

Composition of synthetic solution, mg∙L−1 Volume of synthetic solution, mL Enrichment factora Concentration of Tb(III), ng∙mL−1 Recovery, % RSD, %
Added Found
Na+(20), K+(5), 600 40 100 97 ± 3.9 97 1.6
Mg2+(1), Ca2+(10), 600 40 50 51 ± 2.6 102 2.08
Fe3+(0.5), SO4 2−(5) 1050 70 10 9,8 ± 0.98 98 4.02
Cl(20), HCO3 (50), 1950 130 5 4,7 ± 0.53 94 4.51
NH4 +(1), Zn2+(0.005), NO3 (1) 1950 130 3 2,8 ± 0.49 93.3 7.1
1950 130 0 N.D.b
  1. aEnrichment factor = volume of sample/volume of eluent
  2. bN.D. < Detection limit