Certificate of Certified Reference Material NCS FC 82012a — NCS FC 82017a Coal Ash Issued in 2014 Approved by China National Analysis Center for Iron and Steel ( Beijing China ) Certified Values and Uncertainty No. SiO2 K2O Na2O P2O5 NCS FC Certified Value 46.99 29.45 7.95 8.73 1.03 0.69 1.28 1.16 82012a Uncertainty 0.21 0.21 0.09 0.27 0.06 0.04 0.03 0.04 NCS FC Certified Value 41.11 28.54 13.43 5.30 0.71 5.10 2.62 1.61 82013a Uncertainty 0.21 0.12 0.22 0.08 0.07 0.15 0.05 0.06 NCS FC Certified Value 54.68 28.09 6.04 5.15 1.05 0.49 1.14 1.44 82014a Uncertainty 0.21 0.11 0.09 0.09 0.09 0.04 0.03 0.06 NCS FC Certified Value 59.66 22.90 6.55 4.01 1.31 0.40 1.13 1.53 82015a Uncertainty 0.24 0.10 0.07 0.08 0.10 0.04 0.03 0.07 NCS FC Certified Value 51.24 34.20 4.89 4.73 0.76 0.43 1.26 0.86 82016a Uncertainty 0.19 0.19 0.13 0.06 0.06 0.04 0.05 0.02 NCS FC Certified Value 25.60 10.40 7.17 39.62 3.71 9.04 0.48 0.78 82017a Uncertainty 0.19 0.13 0.15 0.51 0.05 0.15 0.04 0.03 Note: 1.Each certified value is the mean of analytical results of 9 independent laboratories. 0.79 0.03 0.25 0.01 0.52 0.02 0.78 0.02 0.42 0.04 0.83 0.03 0.28 0.02 0.11 0.01 0.38 0.01 0.55 0.03 0.25 0.01 0.04 0.01 Uncertainty U= tα(m-1)ST, Al2O3 Fe2O3 CaO MgO (%) SO3 TiO2 ST is standard deviation. 2.The sample is packed in bottle with size less than 80 meshes. The minimum package is 30 grams. 3.The sample should be protected from contamination when use. It should be stored at dry and cool place. 4.The sample should be grinded to less 160 meshes and stoved at 815°C±10°C to constant weight before analysis. The minimum weight for analysis is 010g. 5.The valid time of the sample is 5 years, although we reserve the right to make change as issue revisions. Analytical Methods Composition SiO2 Al2O3 Fe2O3 CaO MgO SO3 TiO2 K2O Na2O P2O5 Analytical method Silicon-molybdenum blue photometric method; Inductively coupled plasma method; Gravimetric method Fluoride replacement-EDTA titrimetric method; Inductively coupled plasma method EDTA volumetric method; Atomic absorption spectrophotometry Photometric method after separation with titaniumferron EGTA volumetric method; EDTA volumetric method; Atomic absorption spectrophotometry EDTA volumetric method; Atomic absorption spectrophotometry Coulomb-titrimetric method; Gravimetric method Photometric method after separation with titaniumferron; H2O2 photometric method Atomic absorption spectrophotometry; Flame spectrometry; ICP-AES Atomic absorption spectrophotometry; Flame spectrometry; ICP-AES Phosphorus molybdenum blue photometric method; Inductively coupled plasma method
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