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

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)

Composition of synthetic solution, mg∙L⁻¹	Volume of synthetic solution, mL	Enrichment factor^a	Concentration of Tb(III), ng∙mL⁻¹		Recovery, %	RSD, %
Composition of synthetic solution, mg∙L⁻¹	Volume of synthetic solution, mL	Enrichment factor^a	Added	Found	Recovery, %	RSD, %
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
NH₄ ⁺(1), Zn²⁺(0.005), NO₃ ⁻(1)	1950	130	0	N.D.^b	93.3	7.1

ISSN: 2661-801X