Table 5.

Selectivity testing results for ⁸⁰Se⁺ in the presence of interfering species.

Spectral interference for⁸⁰Se⁺	Highest anticipated conc. in human whole blood	Interference concentration	Se recovery in spiked base blood^¥	Se recovery in low QC pool^¥	Se recovery in spiked QMEQAS07B0-09^¥
⁶⁴Ni¹⁶O⁺	0.028 mg L⁻¹ Ni [50]	0.300 mg L⁻¹ Ni	98%	96%	100%
⁶⁴Ni¹²C¹H₄⁺
⁴⁸Ti¹⁶O₂⁺	0.150 mg L⁻¹ Ti^a	1.5 mg L⁻¹ Ti	100%	95%	100%
⁴⁸Ti(¹²C¹H₄)₂⁺
^63MCu¹⁷O⁺	1.5 mg L⁻¹ Cu [50]	15 mg L⁻¹ Cu	99%	94%	102%
⁶⁴Zn¹⁶O⁺	7.18 mg L⁻¹ Zn^b	7 mg L⁻¹ Zn	101%	95%	100%
⁶⁴Zn¹²C¹H₄⁺
⁴⁰Ca⁴⁰Ar⁺	86–100 mg L⁻¹ Ca in serum [50]	500 mg L⁻¹ Ca	102%	97%	102%
⁴⁰K⁴⁰Ar⁺	200 mg L⁻¹ K^c	200 mg L⁻¹ K	101%	97%	102%

Calculated from upper value of 0.15 mg/kg (ppm) [52].

Value calculated from reference of 1.22 μg/mL Zn in plasma and plasma containing 17% of the total Zn in whole blood [53].

See Table 4.

^¥

Results calculated relative to unspiked base blood, QC, or CTQ reference material. Average measured Se concentration in base blood was 268 μg L⁻¹. Average measured Se concentration in low QC pool was 215 μg L⁻¹. Average measured Se concentration in QMEQAS07B-09 was 169 μg L⁻¹.