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

CERTIFIED REFERENCE MATERIAL
SX36-10
Gravels

Version: 003      Date of certification: 09.06.08      Sample form: Powder < 0.125 mm

Analyte Unit Certified value Confidence
interval (95%)		 No. of independent
repeated series		 Measuring
method*		 
  CaO
  SiO2
  Fe2O3
  Mn3O4
  S
 
  %
  %
  %
  %
  %
 
      0.008
     98.80
      0.419
      0.009
      0.009
 
      0.002
      0.20
      0.005
      0.002
      0.001
 
 3
 3
 3
 3
 4
 
1
1
1
1
2
 
  Al2O3
  Na2O
  K2O
  Cr2O3
  H2O 900°C
 
  %
  %
  %
  %
  %
 
      0.234
    < 0.003
      0.014
      0.030
      0.153
 
      0.004
      -.-
      0.001
      0.004
      0.009
 
 3
 3
 5
 3
 3
 
1
3
1,3
1
4
* Measuring method
1: X-ray fluorescence spectrometry
2: Combustion with IR-detection
3: Atomic absorption spectrometry
4: Detection with IR-/ UV-absorption after combustion

Comment
Thermal treatment of material before weighing: 105°C, 1 h