Greening Ultrasound-Assisted Extraction for Sorghum Flour Multielemental Determination by Microwave-Induced Plasma Optical Emission Spectrometry

Table 3

Analyte concentration certified in reference material and determined concentrations in certified reference material (n = 3).

Analyte	Certified values (mg kg^−1)			Determined values (mg kg^−1)			Recovery %
Cu	0.66	±	0.08	0.67	±	0.04	101
K	1290	±	70	1249	±	3	97
Mg	180	±	20	160	±	6	89
Mn	1.55	±	0.08	1.52	±	0.29	98
P	610	±	30	668	±	102	110
Zn	2.90	±	0.30	2.37	±	0.17	82

Reference certified material: Maize Flour (NCS ZC 73010 Mealie).