Table 4.

Selectivity testing results for ⁵⁵Mn⁺ in the presence of interfering species.

Spectral interference for ⁵⁵Mn⁺	Highest anticipated conc. in human whole blood	Interference concentration	Mn recovery in spiked base blood^¥	Mn recovery in spiked QMEQAS09B- 02^¥
¹¹⁰Cd⁺⁺	1.30 μg L⁻¹ Cd^a	12 μg L⁻¹ Cd	99%	98%
³⁹K¹⁶O⁺	200 mg L⁻¹K^b	200 mg L⁻¹ K	101%	97%
³⁷Cl¹⁸O⁺	3800 mg L⁻¹ Cl^c	30,000 mg L^−1α Cl	100%	99%
⁵⁴Fe¹H⁺	405 mg L⁻¹ Fe^d	500 mg L⁻¹ Fe	103%	99%

95th Percentile from NHANES 1999–2002 survey [7].

Calculated from a reference value of 5.1 mmol/L K in adult serum [48].

Calculated from a reference value of 108 mmol/L Cl in plasma [48].

Calculated from reference value of 2700 mg Fe in an adult human [49] 75 mL/kg of blood in an adult (range of 50 – 83 mL/kg) [50]; average adult weight of 88.8 kg [51].

^α

3% HCl matrix (v/v).

^¥

Results calculated as measured Mn concentration in spiked sample relative to unspiked base blood or CTQ reference material. Average measured base blood Mn concentration was 8.5 μg L⁻¹; Average measured QMEQAS09B-02 Mn concentration was 10.2 μg L⁻¹.