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

Table 1 Overall water loss at 900 °C for clinoptilolite samples previously heated at different temperatures

Temperature of the thermal pretreatment, °C	Water loss, %
Unheated form	10.4
50	10.4
100	10.0
200	6.1
200^а	9.9
250	6.1
250^а	9.9
300	9.8
350	9.7
500	9.4
700	6.6

^аClinoptilolite samples heated at the same conditions but additionally kept for 72 h in air with relative humidity of 70 %

ISSN: 2661-801X