The sample consists of material passing a nominal 150µm aperture sieve. It is sold in bottles containing 100g. TRACE ELEMENTS This table gives additional information on Trace Elements supplied by Analyst No. 5. It is given for information only. Mass content in µg/g. Element Ba Ni Sr Y Zn Zr µg/g 13 12 6 23 23 6 4004 Page 2 of 2 BCS – CRM 389/1 HIGH PURITY MAGNESIA NOTES ON METHODS USED SILICA All Analysts, except No. 3, determined silica by X-Ray Fluorescence Spectrometry (XRF) using a fused bead technique. Analyst No. 3 determined silica gravimetrically and also determined residual silica in the filtrate according to ISO 10058:1992. ALUMINA All Analysts, except No. 3, determined alumina by XRF using a fused bead technique. Analyst No. 3 determined alumina gravimetrically as oxine after a sodium hydroxide separation. IRON OXIDE All Analysts, except No. 3, determined iron oxide by XRF using a fused bead technique. Analyst No. 3 determined iron oxide photometrically with o- phenanthroline according to ISO 10058:1992. MANGANESE OXIDE All Analysts, except No. 3, determined manganese oxide by XRF using a fused bead technique. Analyst No. 3 determined manganese oxide photometrically after periodate oxidation according to ISO 10058:1992. CALCIUM OXIDE All Analysts, except No. 3, determined calcium oxide by XRF using a fused bead technique. Analyst No. 3 determined calcium oxide by titration with ethyleneglycol diaminoethyl tetra-acetic acid after separation with potassium hydroxide according to ISO 10058:1992. MAGNESIA All Analysts, except No. 3, determined magnesia by XRF using a fused bead technique. Analyst No. 3 determined magnesia by titration with 2- diaminocyclohexane tetra-acetic acid according to ISO 10058:1992. TITANIA All Analysts, except No. 3, determined titania by XRF using a fused bead technique. Analyst No. 3 determined titania photometrically with diantipyrylmethane according to ISO 10058:1992. PHOSPHORUS PENTOXIDE All Analysts, except No. 3, determined phosphorus pentoxide by XRF using a fused bead technique. Analyst No. 3 determined phosphorus pentoxide photometrically as phosphovanadomolybdate. CHROMIUM OXIDE All Analysts, except No. 3, determined chromium oxide by XRF using a fused bead technique. Analyst No. 3 determined chromium oxide photometrically with diphenylcarbazide according to ISO 10058:1992. BORON OXIDE Analysts Nos. 2 and 9 determined boron using Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES). Analyst No. 3 determined boron photometrically with curcumin. TRACE ELEMENTS Analyst No. 5 determined trace elements by wavelength dispersive XRF using samples prepared as compressed pellets. Values were obtained against a calibration originally verified for silicate rocks. DESCRIPTION OF SAMPLE Bottles of 100g of finely divided material for chemical analysis passing a nominal 90 micron aperture.

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