Microwave-assisted wet digestion with H2O2 at high temperature and pressure using single reaction chamber for elemental determination in milk powder by ICP-OES and ICP-MS.

Autor: Muller EI; Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil. Electronic address: edson_muller@yahoo.com.br., Souza JP; Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil., Muller CC; Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil., Muller ALH; Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil., Mello PA; Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil., Bizzi CA; Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil.
Jazyk: angličtina
Zdroj: Talanta [Talanta] 2016 Aug 15; Vol. 156-157, pp. 232-238. Date of Electronic Publication: 2016 May 10.
DOI: 10.1016/j.talanta.2016.05.019
Abstrakt: In this work a green digestion method which only used H2O2 as an oxidant and high temperature and pressure in the single reaction chamber system (SRC-UltraWave™) was applied for subsequent elemental determination by inductively coupled plasma-based techniques. Milk powder was chosen to demonstrate the feasibility and advantages of the proposed method. Samples masses up to 500mg were efficiently digested, and the determination of Ca, Fe, K, Mg and Na was performed by inductively coupled plasma optical emission spectrometry (ICP-OES), while trace elements (B, Ba, Cd, Cu, Mn, Mo, Pb, Sr and Zn) were determined by inductively coupled plasma mass spectrometry (ICP-MS). Residual carbon (RC) lower than 918mgL(-1) of C was obtained for digests which contributed to minimizing interferences in determination by ICP-OES and ICP-MS. Accuracy was evaluated using certified reference materials NIST 1549 (non-fat milk powder certified reference material) and NIST 8435 (whole milk powder reference material). The results obtained by the proposed method were in agreement with the certified reference values (t-test, 95% confidence level). In addition, no significant difference was observed between results obtained by the proposed method and conventional wet digestion using concentrated HNO3. As digestion was performed without using any kind of acid, the characteristics of final digests were in agreement with green chemistry principles when compared to digests obtained using conventional wet digestion method with concentrated HNO3. Additionally, H2O2 digests were more suitable for subsequent analysis by ICP-based techniques due to of water being the main product of organic matrix oxidation. The proposed method was suitable for quality control of major components and trace elements present in milk powder in consonance with green sample preparation.
(Copyright © 2016 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: