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WANG Di. Corrected Method for Interference of Iron on P2O5 during Complete Silicate Analysis in Uranium-producing Ore[J]. Rock and Mineral Analysis, 2021, 40(5): 783-792. DOI: 10.15898/j.cnki.11-2131/td.202007170104
Citation: WANG Di. Corrected Method for Interference of Iron on P2O5 during Complete Silicate Analysis in Uranium-producing Ore[J]. Rock and Mineral Analysis, 2021, 40(5): 783-792. DOI: 10.15898/j.cnki.11-2131/td.202007170104
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Corrected Method for Interference of Iron on P2O5 during Complete Silicate Analysis in Uranium-producing Ore

    Abstract
  • BACKGROUNDFor the determination of P2O5 in complete silicate analysis of uranium-producing ore by alkali fusion-phosphovanoclonolybeate spectrophotometry with wavelength of 420nm, iron (Fe) was detected simultaneously, because Fe as the co-existing element complexed with ammonium vanadium molybdate and showed the same yellow with phosphovanoclonolybeate. Iron produced positive interference on the results of P2O5.OBJECTIVESTo correct the interference of Fe on the determination of P2O5.METHODSTaking Fe2O3 as the assessment amount of Fe in complete silicate analysis, when detection wavelength was changed from 400nm to 480nm, the effects of different amounts of Fe2O3 (0.00 to 0.70mg/mL) on the absorption value of P2O5 with content of 0.20g/mL, 2.00g/mL and 8.00g/mL were investigated, respectively.RESULTS(1) It was found that when the detection wavelength of P2O5 was changed from 420nm to 450nm, the positive interference produced by Fe2O3 on the analysis results of P2O5 was corrected. Moreover, the contents of Fe2O3 and P2O5 in the sample was within the calibration range at the correction wavelength of 450nm when taking national standard materials GBW04117-GBW04122 of uranium-producing ore as verification samples. (2) When P2O5 in national standard material of uranium-producing rocks, basalts and argillaceous limestone was analyzed at 450nm, the results were within the error range. The method precision (RSD) was between 1.1% and 15.7%, which met requirements of analyzing P2O5 in other samples with a similar matrix such as silicate and uranium ores.CONCLUSIONSThe corrected method is simple and easy to operate. It provides a supplementary method for accurate spectrophotometric determination of P2O5 during complete silicate analysis in uranium-producing ore.

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