The sample consists of material passing a 250µm aperture sieve. It is sold in bottles containing 100g. TRACE ELEMENTS Mass content in µg/g Element Ba Ce Cr Cs Eu Ga Hf La Nb Nd Pb Rb Sc Sm Sr Th U Y Yb Zn Zr µg/g 95 54 12 1 1 17 3 26 15 22 4 52 6 5 101 10 2 18 1 4 79 This table of Trace Elements gives the mean of the mean values obtained by two or more of the Participating Analysts. These values are given for information only. Page 2 of 2 BCS-CRM No. 375/1 SODA FELDSPAR NOTES ON METHODS USED SILICA All Analysts except Nos. 3 and 8 determined silica by X-Ray Fluorescence Spectrometry (XRF) using a fused bead technique. Analysts Nos. 3 and 8 determined silica gravimetrically. No. 3 determined residual silica in the filtrate photometrically. TITANIA All Analysts except No. 3 determined titania by XRF using a fused bead technique. Analyst No. 3 determined titania photometrically with diantipyrylmethane. ALUMINA All Analysts except Nos. 1, 3 and 8 determined alumina by XRF using a fused bead technique. Analyst Nos. 1 and 8 determined alumina using complexometric titration after separation with cupferron. No. 3 determined alumina gravimetrically with 8-hydroxyquinoline. IRON OXIDE All Analysts except Nos. 3 and 8 determined iron oxide by XRF using a fused bead technique. Analyst No.3 determined iron oxide photometrically with o-phenanthroline. Analyst No. 8 used Flame Atomic Absorption Spectrometry (FAAS). SODIUM OXIDE All Analysts except Nos. 3 and 8 determined sodium oxide by XRF using a fused bead technique. Analyst No. 3 used FAAS and No. 8 used Flame Emission Spectrometry (FES) POTASSIUM OXIDE All Analysts except Nos. 3 and 8 determined potassium oxide by XRF using a fused bead technique. Analyst No. 3 used FAAS and No. 8 used FES. CALCIUM OXIDE All Analysts except Nos. 3 and 8 determined calcium oxide by XRF using a fused bead technique. Analysts Nos. 3 and 8 used FAAS. MAGNESIA All Analysts except Nos. 3 and 8 determined magnesia by XRF using a fused bead technique. Analysts Nos. 3 and 8 used FAAS. PHOSOPHORUS 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. LOSS ON IGNITION All Analysts determined the loss on ignition gravimetrically by heating at 1025° ± 25°C to constant weight. TRACE ELEMENTS Analysts Nos. 4 and 6 determined trace elements using XRF, No. 4 used a press powder technique. Analyst No. 11 used Neutron Activation Analysis and Analyst No. 12 used Inductively Coupled Plasma- Mass Spectrometry.

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