Key comparison CCQM-K87 MEASURAND : Mass fraction of ... … · Key comparison CCQM-K87 MEASURAND :...
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Key comparison CCQM-K87 MEASURAND : Mass fraction of Chromium in calibration solutions NOMINALE VALUE : 1 g/kg x i : result of measurement carried out by laboratory i The elemental measurements were carried out for three type of solutions, Solution A, B and C, for which the matrix composition can be found in section 2 of the Final Report. The participants' results are reported here in the order of increasing mass fraction values. u i : combined standard uncertainty of x i Solution A : calibration solution Solution B : sample solution Solution C : "commercial" sample solution x i u i x i u i x i u i / (g/kg) / (g/kg) / (g/kg) / (g/kg) / (g/kg) / (g/kg) VNIIM 0.997 0.00209 UME 1.0006 0.00190 UME 0.9755 0.00229 UME 1.0028 0.00236 NMIA 1.0032 0.00165 CENAM-1 0.9843 0.00184 INTI 1.0047 0.00250 SMU 1.0046 0.00050 SMU 0.9844 0.00065 CENAM-1 1.0063 0.00203 LGC 1.0046 0.00055 KRISS 0.98476 0.00044 GL 1.0085 0.00129 KRISS 1.0049 0.00036 NMIA 0.9848 0.00244 NMISA 1.0096 0.00206 GL 1.0049 0.00055 NMISA 0.9849 0.00191 KRISS 1.00991 0.00031 PTB 1.0050 0.00028 INTI 0.9857 0.00195 NMIA 1.0101 0.00157 CENAM-1 1.0051 0.00142 PTB 0.98578 0.00030 LGC 1.0104 0.00180 BAM 1.0055 0.00031 BAM 0.9861 0.00085 PTB 1.01068 0.00033 NMISA 1.0061 0.00130 NIST 0.9873 0.00110 BAM 1.0109 0.00090 GUM 1.0082 0.00200 NIM 0.9889 0.00130 INM(RO) 1.0110 0.00255 NIST 1.0083 0.00100 GUM 0.9897 0.00490 NIST 1.0121 0.00110 NIM 1.0089 0.00085 LNE 0.9956 0.00270 NIM 1.0150 0.00070 INTI 1.0106 0.00245 VNIIM 0.997 0.00179 GUM 1.0163 0.00500 INM(RO) 1.0130 0.00250 LNE 1.0132 0.00240 VNIIM 1.0150 0.00162 Note: CENAM reported two set of results, identified in the tables of measurement results as CENAM-1 and CENAM-2, for two different instrumentation/methods (see Table 14 page 18 of the Final Report). Lab i Lab i Lab i The BIPM key comparison database, September 2012 1/15
Transcript of Key comparison CCQM-K87 MEASURAND : Mass fraction of ... … · Key comparison CCQM-K87 MEASURAND :...
Key comparison CCQM-K87
MEASURAND : Mass fraction of Chromium in calibration solutions
NOMINALE VALUE : 1 g/kg
x i : result of measurement carried out by laboratory iThe elemental measurements were carried out for three type of solutions, Solution A, B and C, for which the matrix composition can be found in section 2 of the Final Report.The participants' results are reported here in the order of increasing mass fraction values.
u i : combined standard uncertainty of x i
Solution A : calibration solution Solution B : sample solution Solution C : "commercial" sample solution
x i u i x i u i x i u i
/ (g/kg) / (g/kg) / (g/kg) / (g/kg) / (g/kg) / (g/kg) VNIIM 0.997 0.00209 UME 1.0006 0.00190 UME 0.9755 0.00229UME 1.0028 0.00236 NMIA 1.0032 0.00165 CENAM-1 0.9843 0.00184INTI 1.0047 0.00250 SMU 1.0046 0.00050 SMU 0.9844 0.00065CENAM-1 1.0063 0.00203 LGC 1.0046 0.00055 KRISS 0.98476 0.00044GL 1.0085 0.00129 KRISS 1.0049 0.00036 NMIA 0.9848 0.00244NMISA 1.0096 0.00206 GL 1.0049 0.00055 NMISA 0.9849 0.00191KRISS 1.00991 0.00031 PTB 1.0050 0.00028 INTI 0.9857 0.00195NMIA 1.0101 0.00157 CENAM-1 1.0051 0.00142 PTB 0.98578 0.00030LGC 1.0104 0.00180 BAM 1.0055 0.00031 BAM 0.9861 0.00085PTB 1.01068 0.00033 NMISA 1.0061 0.00130 NIST 0.9873 0.00110BAM 1.0109 0.00090 GUM 1.0082 0.00200 NIM 0.9889 0.00130INM(RO) 1.0110 0.00255 NIST 1.0083 0.00100 GUM 0.9897 0.00490NIST 1.0121 0.00110 NIM 1.0089 0.00085 LNE 0.9956 0.00270NIM 1.0150 0.00070 INTI 1.0106 0.00245 VNIIM 0.997 0.00179GUM 1.0163 0.00500 INM(RO) 1.0130 0.00250
LNE 1.0132 0.00240VNIIM 1.0150 0.00162
Note: CENAM reported two set of results, identified in the tables of measurement results as CENAM-1 and CENAM-2,for two different instrumentation/methods (see Table 14 page 18 of the Final Report).
Lab i Lab i Lab i
The BIPM key comparison database, September 2012 1/15
Key comparison CCQM-K87
MEASURAND : Mass fraction of Cobalt in calibration solutions
NOMINALE VALUE : 1 g/kg
x i : result of measurement carried out by laboratory iThe elemental measurements were carried out for three type of solutions, Solution A, B and C, for which the matrix composition can be found in section 2 of the Final Report.The participants' results are reported here in the order of increasing mass fraction values.
u i : combined standard uncertainty of x i
Solution A : calibration solution Solution B : sample solution Solution C : "commercial" sample solution
x i u i x i u i x i u i
/ (g/kg) / (g/kg) / (g/kg) / (g/kg) / (g/kg) / (g/kg) NMIA 0.9797 0.00163 INTI 0.98708 0.00160 VNIIM 1.002 0.00240NIM 0.9798 0.00080 VNIIM 0.99179 0.00208 INTI 1.0039 0.00205PTB 0.98002 0.00032 INM(RO) 0.99375 0.00250 UME 1.0147 0.00193CENAM-1 0.9801 0.00103 GUM 0.99375 0.00240 NIM 1.0170 0.00085NMIJ 0.98011 0.00023 INMETRO 0.99414 0.00200 LNE 1.0170 0.00070KRISS 0.98034 0.00032 NIM 0.99754 0.00075 CENAM-1 1.0177 0.00106NIST 0.9806 0.00110 UME 0.99806 0.00165 NMISA 1.0177 0.00168NMISA 0.9806 0.00126 NMISA 0.99914 0.00091 KRISS 1.01780 0.00027GL 0.9815 0.00107 NMIA 0.99933 0.00108 NMIJ 1.01781 0.00023GUM 0.9832 0.00670 LNE 0.9994 0.00070 PTB 1.01793 0.00028UME 0.9834 0.00202 GL 0.99963 0.00041 SMU 1.01796 0.00053INMETRO 0.9851 0.00225 NMIJ 0.99963 0.00007 GUM 1.0181 0.00720INTI 0.9854 0.00205 KRISS 0.99981 0.00025 INMETRO 1.0182 0.00230LGC 0.9858 0.00185 CENAM-1 0.99985 0.00089 NIST 1.0185 0.00110INM(RO) 0.9890 0.00245 SMU 0.99991 0.00035 NMIA 1.0190 0.00160VNIIM 1.002 0.00251 PTB 0.99999 0.00043
LGC 1.00012 0.00155NIST 1.0009 0.00100
Note: CENAM reported two set of results, identified in the tables of measurement results as CENAM-1 and CENAM-2,for two different instrumentation/methods (see Table 14 page 18 of the Final Report).
Lab i Lab i Lab i
The BIPM key comparison database, September 2012 2/15
Key comparison CCQM-K87
MEASURAND : Mass fraction of Lead in calibration solutions
NOMINALE VALUE : 1 g/kg
x i : result of measurement carried out by laboratory iThe elemental measurements were carried out for three type of solutions, Solution A, B and C, for which the matrix composition can be found in section 2 of the Final Report.The participants' results are reported here in the order of increasing mass fraction values.
u i : combined standard uncertainty of x i
Solution A : calibration solution Solution B : sample solution Solution C : "commercial" sample solution
x i u i x i u i x i u i
/ (g/kg) / (g/kg) / (g/kg) / (g/kg) / (g/kg) / (g/kg) BAM 0.9793 0.00085 INTI 0.9859 0.00225 NMISA 0.9805 0.00210NMIJ 0.97946 0.00022 UME 0.9872 0.00094 NMIA 0.9811 0.00160PTB 0.97968 0.00033 NMIA 0.9922 0.00124 BAM 0.9820 0.00085LGC 0.9797 0.00075 CENAM-2 0.9930 0.00044 NIM 0.9822 0.00070NIM 0.9797 0.00085 NIST 0.9932 0.00110 KRISS 0.9826 0.00059KRISS 0.9798 0.00074 GL 0.9933 0.00063 NMIJ 0.98278 0.00022CENAM-1 0.9802 0.00189 KRISS 0.9937 0.00036 PTB 0.98287 0.00028GL 0.98046 0.00104 PTB 0.99371 0.00029 SMU 0.9830 0.00070NIST 0.9807 0.00110 LGC 0.9940 0.00070 CENAM-1 0.9832 0.00198NMIA 0.9807 0.00190 SMU 0.9942 0.00035 NIST 0.9835 0.00110NMISA 0.9822 0.00226 BAM 0.9943 0.00041 CENAM-2 0.98373 0.00045INM(RO) 0.9870 0.00249 CENAM-1 0.9943 0.00205 LNE 0.9850 0.00120UME 0.9921 0.00094 NMIJ 0.9944 0.00013 UME 0.9880 0.00094VNIIM 0.993 0.00258 INM(RO) 0.9946 0.00244 INTI 0.9901 0.00190INTI 1.0053 0.00215 NIM 0.9950 0.00110 VNIIM 0.994 0.00249GUM 1.0359 0.00725 GUM 0.9952 0.00220 GUM 1.0380 0.00829
LNE 0.9963 0.00135NMISA 0.9968 0.00197VNIIM 0.9996 0.00240
Note: CENAM reported two set of results, identified in the tables of measurement results as CENAM-1 and CENAM-2,for two different instrumentation/methods (see Table 14 page 18 of the Final Report).
Lab i Lab i Lab i
The BIPM key comparison database, September 2012 3/15
Key comparison CCQM-K87
MEASURAND : Mass fraction of Chromium in calibration solutions NOMINALE VALUE : 1 g/kg
No pair-wise degrees of equivalence have been computed for this key comparison.
Solution A : calibration solution Solution B : sample solution Solution C : "commercial" sample solution
Lab i Lab i Lab iD i U i D i U i D i U i
/ (g/kg) / (g/kg) / (g/kg) / (g/kg) / (g/kg) / (g/kg)VNIIM -0.01300 0.0044 UME -0.00438 0.0040 UME -0.00948 0.0048UME -0.00720 0.0049 NMIA -0.00175 0.0036 CENAM-1 -0.00064 0.0039INTI -0.00530 0.0052 SMU -0.00038 0.0016 SMU -0.00058 0.0018CENAM-1 -0.00374 0.0043 LGC -0.00034 0.0017 KRISS -0.00022 0.0016GL -0.00150 0.0029 KRISS -0.00004 0.0015 NMIA -0.00018 0.0050NMISA -0.00040 0.0043 GL -0.00003 0.0017 NMISA -0.00008 0.0040KRISS -0.00009 0.0014 PTB 0.00006 0.0014 INTI 0.00072 0.0041NMIA 0.00010 0.0034 CENAM-1 0.00007 0.0031 PTB 0.00080 0.0014LGC 0.00040 0.0038 BAM 0.00056 0.0014 BAM 0.00112 0.0021PTB 0.00068 0.0015 NMISA 0.00108 0.0029 NIST 0.00232 0.0025BAM 0.00090 0.0022 GUM 0.00320 0.0042 NIM 0.00397 0.0029INM(RO) 0.00100 0.0053 NIST 0.00330 0.0024 GUM 0.00472 0.0099NIST 0.00210 0.0026 NIM 0.00387 0.0021 LNE 0.01062 0.0055NIM 0.00495 0.0019 INTI 0.00562 0.0051 VNIIM 0.01202 0.0038GUM 0.00630 0.0101 INM(RO) 0.00805 0.0052
LNE 0.00822 0.0050VNIIM 0.01007 0.0035
For each type of solutions, the key comparison reference value, x R, which is the gravimetric value calculated from the sample preparation, as well as its associated expanded uncertainty (k = 2), U R, were calculated using Equation 11 on page 12 of the Final Report.Sample A : x R = 1.0100 g/kg, U R = 0.0013 g/kgSample B : x R = 1.0050 g/kg, U R = 0.0013 g/kgSample C : x R = 0.9850 g/kg, U R = 0.0013 g/kg
The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms, both expressed in g/kg:D i = (x i - x R) and its expanded uncertainty, U i (k = 2), U i = 2(u i
2 + (U R/2)2)1/2.
The BIPM key comparison database, September 2012 4/15
MEASURAND : Mass fraction of Platinum in algal material
-0.020
-0.015
-0.010
-0.005
0.000
0.005
0.010
0.015
0.020
VNIIM UME INTI CENAM-1 GL NMISA KRISS NMIA LGC PTB BAM INM(RO) NIST NIM GUM
[Di=
xi-
x R] /
(g/k
g)CCQM-K87
Mass fraction of Chromium in Sample A Calibration solution Degrees of equivalence, Di and expanded uncertainty Ui (k = 2)
xR = 1.0100 g/kgUR = 0.0013 g/kg
The BIPM key comparison database, June 2011 5/15
MEASURAND : Mass fraction of Platinum in algal material
-0.020
-0.015
-0.010
-0.005
0.000
0.005
0.010
0.015
0.020
UME NMIA SMU LGC KRISS GL PTB CENAM-1
BAM NMISA GUM NIST NIM INTI INM(RO) LNE VNIIM
[Di=
xi-
x R] /
(g/k
g)CCQM-K87
Mass fraction of Chromium in Sample B Sample solution Degrees of equivalence, Di and expanded uncertainty Ui (k = 2)
xR = 1.0050 g/kgUR = 0.0013 g/kg
The BIPM key comparison database, June 2011 6/15
MEASURAND : Mass fraction of Platinum in algal material
-0.020
-0.015
-0.010
-0.005
0.000
0.005
0.010
0.015
0.020
UME CENAM-1 SMU KRISS NMIA NMISA INTI PTB BAM NIST NIM GUM LNE VNIIM
[Di=
xi-
x R] /
(g/k
g)CCQM-K87
Mass fraction of Chromium in Sample C "Commercial" sample solution Degrees of equivalence, Di and expanded uncertainty Ui (k = 2)
xR = 0.9850 g/kgUR = 0.0013 g/kg
The BIPM key comparison database, June 2011 7/15
Key comparison CCQM-K87
MEASURAND : Mass fraction of Cobalt in calibration solutions NOMINALE VALUE : 1 g/kg
No pair-wise degrees of equivalence have been computed for this key comparison.
Solution A : calibration solution Solution B : sample solution Solution C : "commercial" sample solution
Lab i Lab i Lab iD i U i D i U i D i U i
/ (g/kg) / (g/kg) / (g/kg) / (g/kg) / (g/kg) / (g/kg)NMIA -0.00033 0.0035 INTI -0.01289 0.0034 VNIIM -0.01600 0.0050NIM -0.00018 0.0020 VNIIM -0.00818 0.0043 INTI -0.01410 0.0043PTB -0.00001 0.0013 INM(RO) -0.00622 0.0051 UME -0.00330 0.0040CENAM-1 0.00008 0.0024 GUM -0.00622 0.0049 NIM -0.00105 0.0021NMIJ 0.00008 0.0013 INMETRO -0.00583 0.0042 LNE -0.00100 0.0019KRISS 0.00031 0.0013 NIM -0.00243 0.0019 CENAM-1 -0.00033 0.0024NIST 0.00057 0.0025 UME -0.00191 0.0035 NMISA -0.00030 0.0036NMISA 0.00057 0.0028 NMISA -0.00083 0.0022 KRISS -0.00020 0.0013GL 0.00147 0.0024 NMIA -0.00064 0.0025 NMIJ -0.00019 0.0013GUM 0.00317 0.0135 LNE -0.00057 0.0018 PTB -0.00007 0.0013UME 0.00337 0.0042 GL -0.00034 0.0015 SMU -0.00004 0.0016INMETRO 0.00507 0.0047 NMIJ -0.00034 0.0012 GUM 0.00010 0.0145INTI 0.00537 0.0043 KRISS -0.00016 0.0013 INMETRO 0.00020 0.0048LGC 0.00577 0.0039 CENAM-1 -0.00012 0.0021 NIST 0.00050 0.0025INM(RO) 0.00897 0.0050 SMU -0.00006 0.0014 NMIA 0.00100 0.0034VNIIM 0.02197 0.0051 PTB 0.00002 0.0015
LGC 0.00015 0.0033NIST 0.00093 0.0023
For each type of solutions, the key comparison reference value, x R, which is the gravimetric value calculated from the sample preparation, as well as its associated expanded uncertainty (k = 2), U R, were calculated using Equation 11 on page 12 of the Final Report.Sample A : x R = 0.9800 g/kg, U R = 0.0012 g/kgSample B : x R = 1.0000 g/kg, U R = 0.0012 g/kgSample C : x R = 1.0180 g/kg, U R = 0.0012 g/kg
The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms, both expressed in g/kg:D i = (x i - x R) and its expanded uncertainty, U i (k = 2), U i = 2(u i
2 + (U R/2)2)1/2.
The BIPM key comparison database, September 2012 8/15
MEASURAND : Mass fraction of Platinum in algal material
-0.030
-0.025
-0.020
-0.015
-0.010
-0.005
0.000
0.005
0.010
0.015
0.020
0.025
0.030
NMIA NIM PTB CENAM-1 NMIJ KRISS NIST NMISA GL GUM UME INMETRO INTI LGC INM(RO) VNIIM
[Di=
xi-
x R] /
(g/k
g)CCQM-K87
Mass fraction of Cobalt in Sample A Calibration solution Degrees of equivalence, Di and expanded uncertainty Ui (k = 2)
xR = 0.9800 g/kgUR = 0.0012 g/kg
The BIPM key comparison database, June 2011 9/15
MEASURAND : Mass fraction of Platinum in algal material
-0.030
-0.025
-0.020
-0.015
-0.010
-0.005
0.000
0.005
0.010
0.015
0.020
0.025
0.030
INTI VNIIM INM(RO) GUM INMETRO NIM UME NMISA NMIA LNE GL NMIJ KRISS CENAM-1 SMU PTB LGC NIST
[Di=
xi-
x R] /
(g/k
g)CCQM-K87
Mass fraction of Cobalt in Sample B Sample solution Degrees of equivalence, Di and expanded uncertainty Ui (k = 2)
xR = 1.0000 g/kgUR = 0.0012 g/kg
The BIPM key comparison database, June 2011 10/15
MEASURAND : Mass fraction of Platinum in algal material
-0.020
-0.015
-0.010
-0.005
0.000
0.005
0.010
0.015
0.020
VNIIM INTI UME NIM LNE CENAM-1 NMISA KRISS NMIJ PTB SMU GUM INMETRO NIST NMIA
[Di=
xi-
x R] /
(g/k
g)CCQM-K87
Mass fraction of Cobalt in Sample C "Commercial" sample solution Degrees of equivalence, Di and expanded uncertainty Ui (k = 2)
xR = 1.0180 g/kgUR = 0.0012 g/kg
The BIPM key comparison database, September 2012 11/15
Key comparison CCQM-K87
MEASURAND : Mass fraction of Lead in calibration solutions NOMINALE VALUE : 1 g/kg
No pair-wise degrees of equivalence have been computed for this key comparison.
Solution A : calibration solution Solution B : sample solution Solution C : "commercial" sample solution
Lab i Lab i Lab iD i U i D i U i D i U i
/ (g/kg) / (g/kg) / (g/kg) / (g/kg) / (g/kg) / (g/kg)BAM -0.00066 0.0020 INTI -0.00806 0.0046 NMISA -0.00248 0.0043NMIJ -0.00050 0.0012 UME -0.00679 0.0022 NMIA -0.00188 0.0034PTB -0.00028 0.0013 NMIA -0.00179 0.0027 BAM -0.00098 0.0020LGC -0.00026 0.0019 CENAM-2 -0.00101 0.0014 NIM -0.00083 0.0018NIM -0.00023 0.0020 NIST -0.00081 0.0025 KRISS -0.00034 0.0016KRISS -0.00012 0.0018 GL -0.00071 0.0017 NMIJ -0.00020 0.0012CENAM-1 0.00022 0.0039 KRISS -0.00035 0.0013 PTB -0.00011 0.0012GL 0.00050 0.0023 PTB -0.00029 0.0013 SMU 0.00003 0.0018NIST 0.00074 0.0025 LGC -0.00002 0.0018 CENAM-1 0.00022 0.0041NMIA 0.00074 0.0040 SMU 0.00022 0.0013 NIST 0.00052 0.0025NMISA 0.00224 0.0047 BAM 0.00032 0.0014 CENAM-2 0.00075 0.0014INM(RO) 0.00703 0.0051 CENAM-1 0.00034 0.0043 LNE 0.00202 0.0026UME 0.01214 0.0022 NMIJ 0.00035 0.0011 UME 0.00502 0.0022VNIIM 0.01304 0.0053 INM(RO) 0.00063 0.0050 INTI 0.00712 0.0040INTI 0.02534 0.0044 NIM 0.00095 0.0025 VNIIM 0.01102 0.0051GUM 0.05592 0.0145 GUM 0.00115 0.0045 GUM 0.05498 0.0166
LNE 0.00230 0.0029NMISA 0.00282 0.0041VNIIM 0.00556 0.0049
For each type of solutions, the key comparison reference value, x R, which is the gravimetric value calculated from the sample preparation, as well as its associated expanded uncertainty (k = 2), U R, were calculated using Equation 11 on page 12 of the Final Report.Sample A : x R = 0.9800 g/kg, U R = 0.0011 g/kgSample B : x R = 0.9940 g/kg, U R = 0.0011 g/kgSample C : x R = 0.9830 g/kg, U R = 0.0011 g/kg
The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms, both expressed in g/kg:D i = (x i - x R) and its expanded uncertainty, U i (k = 2), U i = 2(u i
2 + (U R/2)2)1/2.
The BIPM key comparison database, September 2012 12/15
MEASURAND : Mass fraction of Platinum in algal material
-0.030
-0.025
-0.020
-0.015
-0.010
-0.005
0.000
0.005
0.010
0.015
0.020
0.025
0.030B
AM
NM
IJ
PTB
LGC
NIM
KR
ISS
CE
NA
M-1 GL
NIS
T
NM
IA
NM
ISA
INM
(RO
)
UM
E
VN
IIM INTI
GU
M
[Di=
xi-
x R] /
(g/k
g)CCQM-K87
Mass fraction of Lead in Sample A Calibration solution Degrees of equivalence, Di and expanded uncertainty Ui (k = 2)
xR 0.9800 g/kgUR = 0.0011 g/kg
DGUM = 0.05592 g/kgUGUM = 0.0145 g/kg
The BIPM key comparison database, September 2012 13/15
MEASURAND : Mass fraction of Platinum in algal material
-0.030
-0.025
-0.020
-0.015
-0.010
-0.005
0.000
0.005
0.010
0.015
0.020
0.025
0.030IN
TI
UM
E
NM
IA
CE
NA
M-2
NIS
T
GL
KR
ISS
PTB
LGC
SM
U
BAM
CE
NA
M-1
NM
IJ
INM
(RO
)
NIM
GU
M
LNE
NM
ISA
VN
IIM
[Di=
xi-
x R] /
(g/k
g)CCQM-K87
Mass fraction of Lead in Sample B Sample solution Degrees of equivalence, Di and expanded uncertainty Ui (k = 2)
xR = 0.9940 g/kgUR = 0.0011 g/kg
The BIPM key comparison database, September 2012 14/15
MEASURAND : Mass fraction of Platinum in algal material
-0.020
-0.015
-0.010
-0.005
0.000
0.005
0.010
0.015
0.020N
MIS
A
NM
IA
BA
M
NIM
KR
ISS
NM
IJ
PTB
SM
U
CE
NA
M-1
NIS
T
CE
NA
M-2
LNE
UM
E
INTI
VN
IIM
GU
M
[Di=
xi-
x R] /
(g/k
g)CCQM-K87
Mass fraction of Lead in Sample C "Commercial" sample solution Degrees of equivalence, Di and expanded uncertainty Ui (k = 2)
xR = 0.9830 g/kgUR = 0.0011 g/kg
DGUM = 0.05498 g/kgUGUM = 0.0166 g/kg
The BIPM key comparison database, September 2012 15/15
