The determination of Se⁴⁺ and total selenium in different Se⁴⁺/Se⁶⁺ mixtures.

Sample	[Se4+] and [Se6+]; ng mL−1	Found by the sensor; ng mL−1		Total Se, ETAAS
		[Se4+]	Total SE
1	[Se4+] = 50; [Se6+] = 0.0	49.6 ± 0.07	49.6 ± 0.51	50.7 ± 0.25
2	[Se4+] = 50; [Se6+] = 25	49.5 ± 0.12	75.4 ± 0.68	74.4 ± 0.41
3	[Se4+] = 50; [Se6+] = 50	50.7 ± 0.11	99.2 ± 0.74	101.2 ± 0.36
4	[Se4+] = 70; [Se6+] = 70	70.5 ± 0.08	140.8 ± 0.91	138.6 ± 0.29
5	[Se4+] = 80; [Se6+] = 40	80.5 ± 0.09	119.6 ± 0.77	121.2 ± 0.26
6	[Se4+] = 80; [Se6+] = 80	79.4 ± 0.14	158.6 ± 0.83	161.8 ± 0.37
7	[Se4+] = 40; [Se6+] = 80	39.5 ± 0.10	121.4 ± 0.69	118.9 ± 0.28
8	[Se4+] = 60; [Se6+] = 100	60.8 ± 0.15	158.6 ± 0.58	162.4 ± 0.43