Laboratory accredited by GAZ, (Association for the Accreditation and Certification GmbH) Attestation no. 91021

CERTIFIED REFERENCE MATERIAL
SX42-08
Mg-stone

Version: 003      Date of certification: 25.06.08      Sample form: Powder < 0.125 mm

Analyte Unit Certified value Confidence
interval (95%)		 No. of independent
repeated series		 Measuring
method*		 
  CaO
  SiO2
  Fe2O3
  Mn3O4
  P2O5
 
  %
  %
  %
  %
  %
 
      2.06
      5.09
      1.49
      0.070
      0.077
 
      0.01
      0.04
      0.01
      0.001
      0.001
 
 4
 4
 4
 4
 4
 
1
1
1
1
1
 
  SO3
  Al2O3
  MgO
  TiO2
  K2O
 
  %
  %
  %
  %
  %
 
      0.018
     41.66
     47.83
      0.066
      0.037
 
    < 0.001
      0.20
      0.17
      0.002
      0.001
 
 3
 4
 4
 4
 5
 
2
1
1
1
1,3
 
  ZrO2
  Cr2O3
  ZnO
  CO2
  C tot.
 
  %
  %
  %
  %
  %
 
      0.091
    < 0.080
      0.006
      0.58
      0.353
 
      0.003
      -.-
      0.002
      0.04
      0.007
 
 3
 4
 3
 3
 3
 
1
1
1
4
5
 
  H2O 900°C
 
  %
 
      0.89
 
      0.04
 
 3
 
6
* Measuring method
1: X-ray fluorescence spectrometry
2: Combustion with IR-detection
3: Atomic absorption spectrometry
4: Digestion by acids, coulometric detection
5: Combustion with coulometric detection
6: detection with IR-/ UV-absorption after combustion

Comment
Thermal treatment of material before weighing: 105°C, 4 h