Mẫu chuẩn vật liệu BAS SS-CRM 461/1
ANALYSES
Mean of 4 values - mass content in %.
NB: Although widely accepted within the industry “mass content in %” is neither an SI nor an IUPAC supported quantity. Multiplication by 104 will yield the value in μg/g.
Analyst
No. C Si Mn P S Cr Mo Ni Cu Co
1 ... 0.3605 0.6665 0.0063 0.0042 14.7875 0.0146 ... 0.0089 0.0052
2 0.0099 0.3953 0.6983 0.0052 0.0053 14.7245 0.0128 6.1263 0.0097 0.0048
3 0.0093 0.3633 0.7108 0.0048 0.0043 14.7560 0.0143 6.1510 0.0090 0.0038
4 0.0119 0.3708 0.6916 0.0047 0.0053 14.7167 0.0134 6.1455 0.0084 0.0052
5 0.0112 0.3800 0.6838 0.0055 0.0047 14.7378 0.0143 6.1309 0.0104 0.0035
6 0.0109 0.3723 0.6752 ... 0.0054 14.7230 ... ... ... ...
7 0.0107 0.3754 0.6758 0.0053 0.0054 14.6968 0.0142 6.1096 0.0090 0.0036
8 0.0093 0.3713 0.6945 ... 0.0064 14.7118 0.0139 6.1000 ... 0.0041
9 0.0095 0.3808 0.6778 0.0051 0.0046 14.6910 0.0130 6.1058 0.0086 0.0030
MM 0.0103 0.3744 0.6860 0.0053 0.0051 14.7272 0.0138 6.1242 0.0091 0.0042
sM 0.0010 0.0104 0.0139 0.0006 0.0007 0.0300 0.0007 0.0199 0.0007 ...
The above figures are those which each Analyst has decided upon after careful verification.
Figures in bold type certified, figures in small italic type only approximate.
MM: Mean of the laboratory mean values. sM: standard deviation of the laboratory mean values.
The following additional information was supplied by Analyst No. 5:- Al 0.002%, As 0.004%, Pb 0.0005%
CERTIFIED VALUES (Cv)
mass content in %
C Si Mn P S Cr Mo Ni Cu
Cv 0.0103 0.374 0.686 0.0053 0.0051 14.727 0.0138 6.124 0.0091
C(95%) 0.0009 0.008 0.011 0.0005 0.0006 0.024 0.0006 0.019 0.0007
The half width confidence interval, C(95%), is an expression of the uncertainty of the certified value.
C(95%) =n
st M where “t” is the appropriate two sided Student’s t value at the 95% confidence level for “n” acceptable mean values.
For further information regarding the confidence interval for the certified value see ISO Guide 35.