Table 1.

Element content in the certified reference materials, expressed as mg·kg⁻¹ dry weigh, and the recovery (in %) calculated for each element.

Minerals	Reference materials (mg·kg −1 )
	Skimmed Milk Powder BD150			Milk Powder 1549
	Experimental	Reference	Recovery	Experimental	Reference	Recovery
Ca	12,506 ± 428.2	13,900 ± 800	90%	12,277 ± 336	13,000 ± 500	94.4%
Cu	1.2 ± 0.5	1.08 ± 0.06	110%	0.72 ± 0.1	0.7 ± 0.1	103.2%
Fe	3.5 ± 0.3	4.6 ± 0.5	76%	1.87 ± 0.3	1.78 ± 0.1	105%
K	16,829 ± 344	17,000 ± 700	99%	17,335 ± 230	16,900 ± 300	102.6%
Mg	1,304 ± 26.4	1,260 ± 100	103.5%	1,305 ± 26.2	1,200 ± 30	108.7%
Mo	-	-	-	0.342 ± 0.06	0.34 ± 0.10	100.5%
Na	3,495.6 ± 206	4,180 ± 190	84%	4,149 ± 82.5	4,970 ± 100	83%
P	11,688 ± 556.01	11,000 ± 600	106%	11,429 ± 133	10,600 ± 200	108%
Se	0.186 ± 0.005	0.188 ± 0.014	99.1%	0.105 ± 0.5	0.11 ± 0.01	95.5%
Zn	50.7 ± 2.1	44.8 ± 2.01	113%	50.3 ± 2.7	46.1 ± 2.2	109%
Mn	0.3 ± 0.06	0.29 ± 0.018	90%	0.3 ± 0.01	0.26 ± 0.06	103%
I	1.69 ± 0.04	1.73 ± 0.14	97.5%	3.29 ± 0.03	3.38 ± 0.02	97.2%