Microwave Digestion and ICP-MS Determination of Major and Trace Elements in Waste Sm-Co Magnets

Natalia A Korotkova ¹

Vasilisa B Baranovskaya ¹

Kseniya Vadimovna Petrova ¹

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences (IGIC RAS), 119991 Moscow, Russia |

Publication type: Journal Article

Publication date: 2022-08-04

MDPI

Journal: Metals

scimago Q1

SJR: 0.554

CiteScore: 4.9

Impact factor: 2.6

ISSN: 20754701

DOI: 10.3390/met12081308

Copy DOI

Metals and Alloys

General Materials Science

Abstract

In this article, inductively coupled plasma mass-spectrometry (ICP-MS) and inductively coupled plasma optical-emission spectrometry (ICP-OES) were used for the development of an analytical procedure for analysis of the waste of Sm-Co magnets. Experimental parameters related to microwave digestion processes and acid concentrations were optimized. Microwave digestion was carried out in mixtures of HF, HCl, HNO3 and H2SO4. The complete dissolution of the samples occurred in the system: 10 mL H2O, 2 mL HNO3, 10 mL HCl and 1 mL H2SO4. The dependence of the matrix effect on the ICP-MS analysis of waste Sm-Co magnets was studied and optimal instrumental parameters were investigated (nebulizer gas flow, sampling depth and potential at the extractor lens). The optimal conditions were a nebulizer gas flow of 0.85–0.90 L/min, a sampling depth of 101, potential at the extractor lens of −400 V and a sample flow rate of 50 rpm. A recovery test and inter-method experiments were performed to verify the accuracy of the proposed method.

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