Table 6.

Rb and Cs measurement values and spiked recovery rates of actual brines at different dilution ratios.

Sample	TDS	Dilution factor	Diluted TDS	Rb measured	Spiked	Measured (Spiked)	Rb Recovery	Cs measured	Spiked	Measured (Spiked)	Cs Recovery
1	272.0	200	2.72	1.00 ± 0.03	2	3.00 ± 0.2	100 ± 10	0.0194 ± 0.002	0.05	0.0684 ± 0.004	98.0 ± 9
		50	5.44	4.38 ± 0.07	10	15.2 ± 0.3	108 ± 3	0.0429 ± 0.004	0.1	0.139 ± 0.002	96.1 ± 4
		10	27.2	25.2 ± 0.2	25	50.6 ± 0.2	102 ± 1	0.224 ± 0.003	0.2	0.409 ± 0.01	92.5 ± 6
2	348.9	200	1.74	4.68 ± 0.2	5	9.63 ± 0.8	99.0 ± 16	0.263 ± 0.03	0.5	0.692 ± 0.04	85.8 ± 10
		50	6.98	18.2 ± 0.5	25	42.0 ± 1	95.0 ± 6	0.670 ± 0.05	2	2.72 ± 0.005	102 ± 2
		10	34.89	90.8 ± 2	50	142 ± 9	102 ± 18	2.83 ± 0.02	5	7.34 ± 0.6	90.2 ± 12
3	352.7	200	1.76	3.71 ± 0.2	0.5	4.22 ± 0.08	102 ± 37	0.363 ± 0.04	0.5	0.873 ± 0.01	102 ± 8
		50	7.05	15.9 ± 0.05	25	40.5 ± 0.4	98.3 ± 2	0.665 ± 0.02	2	2.73 ± 0.08	103 ± 4
		10	35.27	73.6 ± 2	50	127 ± 3	106 ± 7	3.82 ± 0.1	5	8.80 ± 0.09	99.6 ± 3
4	170.0	200	0.85	10.2 ± 0.2	5	15.3 ± 0.3	101 ± 6	5.13 ± 0.2	5	10.2 ± 0.3	102 ± 6
		50	3.40	42.8 ± 1	25	67.3 ± 1	97.9 ± 7	20.9 ± 0.8	25	43.4 ± 1	90.0 ± 6
		10	17.0	206 ± 5	100	308 ± 10	101 ± 11	98.7 ± 2	100	188 ± 12	89.1 ± 12

Units: TDS (g·L⁻¹), Rb and Cs concentrations (μg·L⁻¹), Recovery (%).