A novel methodology for rapid digestion of rare earth element ores and determination by microwave plasma-atomic emission spectrometry and dynamic reaction cell-inductively coupled plasma-mass spectrometry

Helmeczi, Erick; Wang, Yong; Brindle, Ian D.

doi:10.1016/j.talanta.2016.07.067

Cited by 36 publications

(15 citation statements)

References 12 publications

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“…Thulium result was omitted because its concentration in the final solution was lower than the LOQ (Table ). The results of all other REEs were in good agreement with the reference values and those reported by Helmeczi et al (), indicating that the investigated digestion method was effective. This fact was supported by the absence of any visible residue after OKA‐2 digestion.…”

Section: Resultssupporting

confidence: 90%

“…Table shows the comparison of the REE results obtained for OKA‐2 by ICP‐OES, after the digestion with CPA, with the provisional values reported in the most recent certificate (2017/04/13). It also shows a comparison with the results obtained by Sen Gupta (), Helmeczi et al () and Whitty‐Léveillé et al (). Thulium result was omitted because its concentration in the final solution was lower than the LOQ (Table ).…”

Section: Resultssupporting

confidence: 78%

“… (A), Helmeczi et al (); (B), Whitty‐Léveillé et al (); (C), Sen Gupta (); Cert., certificate value; CI, confidence interval; DCPA, digestion with condensed phosphoric acid; k , coverage factor; LOQ, limit of quantification; n , number of determinations; n.r., not reported; Rec., recovery; REE, rare earth element; RV, reference value; U , expanded uncertainty; 1 s , standard deviation. …”

Section: Resultsmentioning

confidence: 99%

“…The increasing application of rare earth elements (REEs) has resulted in an enhanced demand for sensitive, accurate and environmentally safe analytical methods (Bourzac , Helmeczi et al ) for their quantification. Inductively coupled plasma‐optical emission spectrometry (ICP‐OES) has been one of the most used techniques for the determination of REE mass fractions in geological samples (Navarro et al , Zawisza et al , Gorbatenko and Revina ).…”

mentioning

confidence: 99%

“…Fusion is an effective method for the decomposition of rocks that contain acid‐resistant minerals. However, this method is not regularly used for the quantification of trace elements in geological samples due to the relatively high blank and high TDS in the final solution (Totland et al , Yu et al , Pinto et al , Zhang et al , Helmeczi et al ).…”

mentioning

confidence: 99%

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Hydrofluoric Acid‐Free Digestion of Geological Samples for the Quantification of Rare Earth Elements by Inductively Coupled Plasma‐Optical Emission Spectrometry

Oliveira

Afonso

Silva

et al. 2019

Geostandard Geoanalytic Res

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Rare earth elements (REEs) are very important to technological development as well as to geochemical and environmental studies. In this work, hydrofluoric acid (HF) was replaced by condensed phosphoric acid (CPA) in the digestion of geological samples, and the quantification of REEs was performed by inductively coupled plasma‐optical emission spectrometry (ICP‐OES). Six international reference materials (RMs), named DC86318, CGL 111, CGL 124, CGL 126, OKA‐2 and COQ‐1 and three Brazilian ore samples, named Araxá, Catalão and Pitinga were analysed. Only zircon and xenotime, which are potential REE‐bearing minerals, were not completely dissolved. Nevertheless, no REE associated with zircon was detected. The investigated digestion method presented many advantages: It was relatively fast (3 h), avoided fluoride precipitation, it was less hazardous because handling diluted H3PO4 is safer than HF, NH4F or NH4HF2 aqueous solutions, it preserved the quartz fittings of the measurement equipment and the final solution contained lower levels of total dissolved solids than those produced by the fusion method.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 78%