IUCr CPD Round Robin on Quantitative Phase Analysis

Weighed and Measured Values of Distributed Samples and Data

The CPD-QARR homepage is now located at http://www.iucr.org/resources/commissions/powder-diffraction/projects/qarr

Sample 1       Al2O3      ZnO     CaF2    Total
                 wt%      wt%      wt%     wt%

1a  weighed      1.15    4.04    94.81     100
     XRF         1.22    4.12    94.11

1b  weighed     94.31    1.36     4.33     100
     XRF        94.73    1.38     4.32

1c  weighed      5.04   93.59     1.36     100
     XRF         5.12   93.15     1.33

1d  weighed     13.53   32.89    53.58     100
     XRF        13.80   32.98    52.99

1e  weighed     55.12   15.25    29.62     100
     XRF        55.79   15.34    29.39

1f  weighed     27.06   55.22    17.72     100
     XRF        27.32   54.88    17.44

1g  weighed     31.37   34.21    34.42     100
     XRF        31.70   34.01    33.86

1h  weighed     35.12   30.19    34.69     100
     XRF        35.35   30.03    34.26

                              
Sample 2        Al2O3    ZnO     CaF2    Mg(OH)2   Total
                 wt%     wt%      wt%      wt%      wt%
    weighed     21.27   19.94    22.53    36.26     100
     XRF        20.94   19.49    24.14    36.14     
                              

Sample 3        Al2O3    ZnO     CaF2    Glass   Total
                 wt%     wt%      wt%      wt%     wt%
    weighed     30.79   19.68    20.06    29.47    100
     XRF        31.06   19.64    19.89    27.14     
    Note - glass content underestimated by XRF due to 
           presence of sodium (not measured) in glass


Sample 4        Al2O3   Fe3O4   ZrSiO4  Total
                 wt%     wt%      wt%     wt%     
    weighed     50.46   19.64    29.90    100     
     XRF        50.36   19.56    29.51          
                              

Synthetic Bauxite 
             Weighed amount                    
                   wt%
     Quartz        5.16
     Boehmite     14.93
     Anatase       2.00
     Goethite      9.98
     Kaolinite     3.02
     Gibbsite     54.90
     Hematite     10.00

Granodiorite
    'True' values not known - this is a natural mineral sample