Anhydrite, in the form of coarse chippings, was obtained from British Gypsum (East
Leake, Leicestershire, UK). The material was prepared using a jaw crusher fitted with
hardened chromium steel jaws to provide a powder, nominally 3 mm maximum
diameter. The crushed material was dried at 30 °C i n a calibrated drying oven. After
drying, the material was milled until the powder passed a calibrated 75 µm stainless
steel sieve mesh.
This reference material is intended for use in the validation of new methods, and for
monitoring the performance of methods commonly used in laboratories to analyse
samples of gypsum for quality control and environmental monitoring purposes.
Certified Value
Mercury………………………..2.33 ± 0.18 µg/kg
Assessed Values
Aluminium (as Al
2
O
3
) ....... 0.045 ± 0.029 g/100 g Potassium (as K
2
O) . 0.0105 ± 0.0050 g/100 g
Calcium(as CaO) ............... 40.82 ± 0.67 g/100 g Silicon (as SiO
2
) .......... 0.112 ± 0.044 g/100 g
Iron (as Fe
2
O
3
)............. 0.0280 ± 0.0096 g/100 g Sulfur (as SO
3
) .................. 57.8 ± 1.2 g/100 g
Phosphorus (as P
2
O
5
) .. 0.0069 ± 0.0040 g/100 g Loss on Ignition ........... 0.452 ± 0.093 g/100 g
Indicative Values
Magnesium (as MgO) .................. 0.080 g/100 g Strontium (as SrO) ..................... 0.18 g/100 g
Manganese (as MnO) ................ 0.0025 g/100 g Titanium (as TiO
2
) .................. 0.0066 g/100 g
Sodium (as Na
2
O)........................ 0.023 g/100 g
Arsenic ............................................ 0.16 mg/kg Lead ............................................... 1.6 mg/kg
Chromium .......................................... 4.4 mg/kg Nickel ............................................. 1.9 mg/kg
Cobalt .............................................. 0.35 mg/kg Vanadium ....................................... 2.6 mg/kg
Copper .............................................. 3.5 mg/kg Zinc .............................................. 1.6 g/100 g
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