Microwave-Assisted Acid Digestion of Malaysian Monazite for Determination of REEs Using ICP-MS

Abstract:

The objective of this study to investigate microwave-assisted digestion as a rapid sample preparation method for the determination of REEs in Malaysian monazite using Inductively Coupled plasma-mass spectrometry (ICP-MS). Finely powdered monazite (D90 < 75μm) was the raw material for the digestion and fusion procedures. In the Li-borate fusion method, the digestion was achieved by lithium tetraborate: metaborate flux (Li₂B4O₇: LiBO₂) flux fusion followed by acid attack, using nitric acid (HNO₃). The second method, the microwave-assisted digestion method, involved digestion of the monazite in a mixture of H₂SO₄, HNO₃, and HF, followed by neutralization of the insoluble fluorides and complexation of residual HF. The concentrations of REEs, measured by both the methods, were in agreement with each other, except for the values of P and Si, which were slightly apart. Both the sample dissolution methods offer feasible means of quantifying REEs in the monazite sample, but only a combined microwave digestion-fusion technique yields complete quantitative data for monazite-type samples.

• Periodical: Key Engineering Materials (Volume 908)
• Pages: 481-486
• DOI: https://doi.org/10.4028/p-s087r4
• Online since: January 2022
• Authors: Sanjith Udayakumar, Norlia Baharun, Sheikh Abdul Rezan*
• Keywords: Inductively Coupled Plasma Spectroscopy (ICP), Microwave-Assisted Digestion, Monazite, Rare Earth Elements (REEs)

References

[1] Zawisza, K. Pytlakowska, B. Feist, M. Polowniak, A. Kita and R. Sitko, J. Anal. At. Spectrom. 26 (2011), 2373-2390.

DOI: 10.1039/c1ja10140d

[2] T.P. Rao and V.M. Biju, Crit. Rev. Anal. Chem. 30 (2000), 179-220 (2000). https://doi.org/10.1080/10408340091164234.

[3] A. Gorbatenko and E. Revina, Inorg. Mater. 51(2015), 1375-1388.

[4] V. Balaram, Bull. Mater. Sci. 28(2005), 345-348.

[5] C. Agatemor and D. Beauchemin, Anal. Chim. Acta. 706(2011), 66-83.

[6] S. Mitra, Sample preparation techniques in analytical chemistry, John Wiley & Sons, (2004).

[7] V. Balaram and T.G. Rao, At. Spectrosc. 24(2003), 206-212.

[8] M.S. Navarro, S. Andrade, H. Ulbrich, C.B. Gomes and V.A. Girardi, Geostand. Geoanalytical Res. 32(2008), 167-180.

[9] MARS 6 Method Note Compendium: CEM; 2019. Information on www.cem.com/media/contenttype/media/literature/MetNote_MARS6_Compendium.pdf.

[10] Z. Alfassi and C.M. Wai, Preconcentration techniques for trace elements, CRC press, (1991).

[11] U. FDA, EPA 402-B-04-001C, NTIS PB2004-105421, Alexandria, VA, USA, (2004).

[12] S. Udayakumar, A.F.M. Noor, S.A.R.S.A. Hamid, T.A.R. Putra and C.G. Anderson, Mining Metall. Explor. (2000), 1-17.

[13] H. Homma, Rigaku Journal, 34(2018), 5.

[14] M. Alvarez, X-Ray Spectrom. 19(1990), 203-206.

[15] R. Schramm, Phys. Sci. Rev. 1 (2016).

[16] B. Qian, X. Liang, S. Yang, S. He and L. Gao, J. Mol. Struct., 1027(2012), 31-35.

[17] D. Zachmann, Anal. Chem. 60(1988), 420-427.

[18] J. Rajendran, G. Balasubramanian and P. Thampi, Curr. Sci. (2008), 1296-1302.

[19] L. Whitty-Léveillé, K. Turgeon, C. Bazin and D. Larivière, Anal. Chim. Acta., 961(2017), 33-41.

[20] M.M. Todand, I. Jarvis and K.E. Jarvis, Chem. Geol. 124 (1995), 21-36.

[21] M. Totland, I. Jarvis and K.E. Jarvis, Chem. Geol. 95(1992), 35-62.

[22] R.S. Amais, J.A. Nóbrega and G.L. Donati, J. Anal. At. Spectrom., 29 (2014), 1258-1264.

[23] P.-K. Chen, M.R. Rosana, G.B. Dudley and A. Stiegman, J. Org. Chem, 79 (2014), 7425-7436.

[24] C.Corporation,Microwave Heating - Increasing Reaction Rate, Available on https://cem.com/in/microwave-heating-increasing-reaction-rate.