Microwave-Assisted Digestion Using Dilute Nitric Acid and Hydrogen Peroxide for Multielement Determination in Wheat Flour by ICP-MS

Table 3

Elemental concentrations (mg/kg) in the standard reference material using the proposed digestion method followed by ICP-MS (mean ± standard deviation, n = 3), with LOD and LOQ of elements expressed in µg/kg.

Elements	Certified value mg(kg)	Found	LOD	LOQ	Recovery %	RSD% (n = 3)
Mg	398 ± 12	3.27 ± 448	0.07	0.23	106.23	0.65
K	1325 ± 20	5.5 ± 1316	0.14	0.46	99.32	0.42
Ca	191.4 ± 3.3	230 ± 6.99	0.27	0.89	108.86	3.79
Al	4.4 ± 1.2	4.47 ± 0.70	0.63	2.07	102.84	4.86
Mn	9.00 ± 0.78	1.14 ± 8.96	0.04	0.13	100.74	3.93
Fe	14.11 ± 0.33	15.4 ± 0.87	0.03	0.10	108.62	4.21
Cu	2.03 ± 0.14	0.12 ± 2.04	0.021	0.069	101.40	2.49
Zn	11.61 ± 0.26	0.03 ± 10.19	0.006	0.019	90.43	0.41
Se	1.14 ± 0.10	1.23 ± 0.03	0.013	0.043	107.89	2.43
Rb	0.671 ± 0.012	0.05 ± 0.73	0.0008	0.0026	107.06	2.98
Cd	0.0254 ± 0.0009	0.001 ± 0.0228	0.001	0.003	91.54	4.44
V	0.01	0.001 ± 0.012	0.0001	0.0003	109.76	3.43
As	0.0048 ± 0.0003	0.0001 ± 0.005	0.0008	0.0026	104.16	2.00