A novel method for microwave-assisted digestion of milk samples using diluted HNOand HO with a single reaction chamber was developed for elemental analysis by ICP-based techniques. The optimal conditions for digestion were 0.25 g of sample mass, 6 mL of 0.1 molLHNOand 2 mL of 30% HO at 250 ℃ and 160 bar. The optimized procedure resulted in low residual carbon content and residual acidity of 260 mgL and 0.06 mol L, respectively. The limits of detection ranged from 0.286ոg g(Ca) to 82.990ոg g(Fe). In addition, the proposed method was considered an excellent green analysis method with a final score of 87 based on the analytical Eco-Scale. Finally, the method was validated and applied to the determination of Al, As, Ba, Ca, Cd, Co, Cr, Cu, Fe, Mg, Mn, Ni, Pb, Sb, Se, and Zn in milk samples from South Korea.
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| http://dx.doi.org/10.1016/j.foodchem.2021.131483 | DOI Listing |
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