Table 1: EDXRF data Br, Fe, Rb, Sr, and Zn contents in the IAEA H-4 (animal muscle) reference material compared to certified values (mg/kg, dry mass basis).

Element Certified values This work results
Mean 95% confidence interval Type Mean ± SD
Br 4.1 3.5-4.7 C 5.0 ± 1.2
Cu 4 3.6-4.3 C 3.9 ± 1.1
Fe 49 47-51 C 48 ± 9
Rb 18 17-20 C 22 ± 4
Sr 0.1 - N < 1
Zn 86 83-90 C 90 ± 5

Mean: Arithmetical mean; SD: Standard Deviation; C: Certified values; N: Non-certified values.