The application of the present method to water and beverage, soil, human hair, and cosmetic samples for the determination of selenium ions.

Samples	Added [ng mL−1]	Founda [ng mL−1]		Recovery (%)	t-testb	F-valueb
		Sensor	ETAAS
Tap water	—	0.40 ± 0.06	0.45 ± 0.85
	40	40.75 ± 0.08	41.00 ± 0.77	100.87	1.86
	80	79.60 ± 0.13	81.00 ± 1.05	99.00		3.77
Mineral water	—	0.30 ± 0.07	0.27 ± 1.15
	50	50.50 ± 0.11	49.80 ± 1.20	100.40	1.67
	100	99.90 ± 0.18	101.0 ± 0.95	99.60		3.93
Underground water	—	0.65 ± 0.14	0.60 ± 0.85
	60	60.35 ± 0.09	61.0 ± 1.05	99.50	2.11
	120	121.0 ± 0.10	120.2 ± 1.30	100.29		4.05
Rain water	—	0.25 ± 0.15	0.25 ± 0.90
	70	69.90 ± 0.07	70.70 ± 0.80	99.50	1.83
	140	140.6 ± 0.12	139.5 ± 1.00	100.25		3.93
River water	—	0.55 ± 0.06	0.50 ± 1.10
	80	80.05 ± 0.08	81.00 ± 1.25	99.94	1.47
	160	161.3 ± 0.13	159.6 ± 0.75	100.47		3.73
Ice tea	—	1.00 ± 0.08	1.00 ± 1.15	—
	55	55.25 ± 0.16	57.2 ± 0.95	98.66		4.04
	110	113.2 ± 0.20	108.5 ± 0.85	101.98	1.97
Mixed fruit juice	—	75.5 ± 0.25	75.0 ± 1.20
	50	126.5 ± 0.21	124.2 ± 1.45	100.80		3.78
	100	173.7 ± 0.13	177.0 ± 0.95	98.97	2.03
Fresh cabbagec	—	1.12 ± 0.07	1.15 ± 1.05
	75	77.00 ± 0.11	74.65 ± 1.30	101.16	1.88
	150	149.7 ± 0.17	153.0 ± 1.55	99.06		3.75
Soilc	—	0.25 ± 0.09	0.25 ± 0.75
	65	65.75 ± 0.14	64.30 ± 1.00	100.77	2.14
	130	128.8 ± 0.19	131.8 ± 1.35	98.88		4.16
Cosmetic preparation (5.0 g lipstick)	—	253.5 ± 0.04	254.0 ± 1.55
	100	365.7 ± 0.11	335.8 ± 2.05	103.45	2.04
	175	415.4 ± 0.13	435.5 ± 1.85	96.90		3.89
	—	225.8 ± 0.15	220.8 ± 1.65
Human hair (0.5 g)	65	280.5 ± 0.18	300.5 ± 0.19	98.15	1.83
	130	360.7 ± 0.20	330.4 ± 0.19	101.38		3.65

^aMean ± SD.

^bTheoretical values for t and F values at 95% confidence level for five degrees of freedom are 2.57 and 5.05, respectively.

^cμg kg⁻¹.