ASSESSMENT OF a SIMPLE METHOD FOR THE DETERMINATION OF NB AND TA AT THE SUB‐μG/G LEVEL IN SILICATE ROCKS BY ICP‐MS

Poitrasson, Franck; Pin, Christian; Télouk, Philippe; Imbert, Jean Louis

doi:10.1111/j.1751-908x.1993.tb00138.x

Cited by 15 publications

(4 citation statements)

References 23 publications

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“…Published ICP-MS data for Nb are higher and vary from 0.59 ppm to 2.1 ppm; however, the values of Jenneret al ( 5 ) and Poitrasson et al (33) are only slightly higher than our results. High Nb data are probably not caused by sample heterogeneities (seeFigure 1).…”

Section: (I) Nb Tacontrasting

confidence: 87%

Trace Element Analysis of Basalt Bir‐1 by Id‐ssms, HPLC and Lims

Jochum¹,

Rehkämper²,

Seufert³

1994

Geostandards Newsletter

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Trace element concentrations in BIR‐1 basalt have been determined by isotope dilution‐spark source mass spectrometry, high performance liquid chromatography and laser ionization mass spectrometry. Of particular interest are the low abundance elements Nb, Ta, Zr, Hf, Th, U, Rb, Cs for which published data vary extremely. Our analyses of most trace elements in four different batches of BIR‐1, however, agree within 10% indicating that these large differences cannot be caused by heterogeneities of the powders but may be attributed to analytical problems. Based on own and recently published data, an attempt is made to assign “preferred values” for BIR‐1 which are at variance with several published consensus or working values by as much as a factor of 110.

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Section: (I) Nb Tacontrasting

confidence: 87%

Trace Element Analysis of Basalt Bir‐1 by Id‐ssms, HPLC and Lims

Jochum¹,

Rehkämper²,

Seufert³

1994

Geostandards Newsletter

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“…Numerous published ICP-MS results are available ( H a l l a n d Pe l c h a t 19 9 0 , J e n n e r e t a l . 19 9 0 , Federowich et al 1993, Garbe-Schönberg 1993, Poitrasson et al 1993, Xie et al 1994, Münker 1998 and even if values for the low Nb concentrations are generally slightly higher, they compare favourably with our XRF data.…”

Section: Comparison With Literature Datasupporting

confidence: 87%

“…(1990), (2) Verma et al (1992), (3) Rehkämper (1994), (4) Jochum et al (1990), (5) Hall and Pelchat (1990), (6) Jenner et al (1990), (7) Garbe-Schönberg (1993), (8) Xie et al (1994), (9)Goguel (1992), (10)Poitrasson et al (1993), (11)Münker (1998), (12) …”

mentioning

confidence: 99%

Precise Quantitative Determination of Niobium at Low Level Concentrations in Geological Samples by WD‐XRF

Étoubleau¹,

Cambon²,

Bougault³

et al. 1999

Geostandards Newsletter

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We show in this paper that wavelength dispersive X‐ray fluorescence spectrometry (WD‐XRF) can provide high quality determinations (in terms of accuracy and precision) of Nb in rocks at low level concentrations comparable with data from much more sensitive analytical techniques. Two different sample preparation methods were investigated and combined with a long count time XRF strategy. We first developed a standard additions procedure for rock powders in conjunction with a careful evaluation of the position of analytical lines (peak and background). The precision (2s) varied from within 0.03 μg g−1 to 0.2 μg g−1 in the 0‐5 μg g−1 concentration range, and the detection limit was 0.2 μg g−1. We then separated Nb from the geological matrix using the chemical procedure described by Rehkämper (1994); after separation, Nb was collected on an anion‐exchange membrane which was directly excited by X‐rays. This method yielded a precision (2s) of 0.2 μg g−1 at the μg g−1 level if 100 mg of sample was used, the detection limit being dependent on the mass of sample studied. Detailed descriptions of analytical procedures are given, particularly of innovative aspects of Nb collection on membranes. XRF results obtained by the two sample preparation methods were compared with instrumental neutron activation (INAA) Ta analysis. We found that the ion‐exchange method tended to provide Nb concentrations which were about 10‐15% lower than concentrations found by the standard additions method. We report data for fifteen international reference materials (NIM‐N, AL‐I, AN‐G, BE‐N, MRG‐1, JA‐1, JB‐2, JB‐3, JA‐2, JF‐1, JGB‐1, BIR‐1, DNC‐1, W‐1, W‐2), for which our XRF results are in good agreement with literature data.

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“…These include X-ray fluoresence methods [36][37][38][39][40], the previously reported detection (XRF) [12][13][14][15][16][17][18][19][20][21], inductively coupled plasma (ICP) limits were not confirmed. mass spectrometry (MS) [11,[22][23][24][25], ICP atomic A widely used metallochromic ligand available in emission spectrometry (AES) [26][27][28][29][30][31], atomic ab-good purity and at a low price is PAR [42]. However, sorption spectrometry (AAS) [32,33], neutron activa-a previously reported method using pre-column tion analysis (NAA) [34] and reversed-phase high-formation of ternary complexes of Nb(V) and Ta(V) with PAR and tartrate and their separation on a C lows: analytical-reagent grade perchloric acid 18 column [35] offered only relatively poor detection (BDH), 99.991% purity hydrofluoric acid (HF, limits.…”

Section: Introductionmentioning

confidence: 99%