Comparison Display

CCQM-K10.2018

MEASURAND Amount fraction of benzene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

Degrees of equivalence represented by D_i = (x_i - x_R_,i) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in nmol mol^-1.

Benzene at 5 nmol mol^-1

D_i / nmol mol^-1

Participating institutes

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CCQM-K10.2018

MEASURAND Amount fraction of toulene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

Degrees of equivalence represented by D_i = (x_i - x_R_,i) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in nmol mol^-1.

Toluene at 5 nmol mol^-1

D_i / nmol mol^-1

Participating institutes

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CCQM-K10.2018

MEASURAND Amount fraction of ethylbenzene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

Degrees of equivalence represented by D_i = (x_i - x_R_,i) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in nmol mol^-1.

Ethylbenzene at 5 nmol mol^-1

D_i / nmol mol^-1

Participating institutes

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CCQM-K10.2018

MEASURAND Amount fraction of p-Xylene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

Degrees of equivalence represented by D_i = (x_i - x_R_,i) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in nmol mol^-1.

p-Xylene at 5 nmol mol^-1

D_i / nmol mol^-1

Participating institutes

**Reported as a combined value for p-xylene and m-xylene as explained in Section 4.3 of the CCQM-K10.2018 Final report

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CCQM-K10.2018

MEASURAND Amount fraction of m-Xylene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

Degrees of equivalence represented by D_i = (x_i - x_R_,i) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in nmol mol^-1.

m-Xylene at 5 nmol mol^-1

D_i / nmol mol^-1

Participating institutes

**Reported as a combined value for p-xylene and m-xylene as explained in Section 4.3 of the CCQM-K10.2018 Final report.

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CCQM-K10.2018

MEASURAND Amount fraction of o-Xylene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

Degrees of equivalence represented by D_i = (x_i - x_R_,i) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in nmol mol^-1.

o-Xylene at 5 nmol mol^-1

D_i / nmol mol^-1

Participating institutes

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CCQM-K10.2018

MEASURAND Amount fraction of benzene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

Degrees of equivalence represented by D_i = (x_i - x_R_,i) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in nmol mol^-1.

LAB_i	D_i	U_neg,i	U_pos,i
	nmol mol^-1	nmol mol^-1	nmol mol^-1
KRISS	0.005	0.280
LNE	0.500	0.295
NIST	0.135	0.217
NMISA	-0.297	0.233
NPL	0.020	0.226
VNIIM	0.530	0.258
VSL	0.041	0.225
METAS	1.119	0.710
UBA	-0.001	0.095
CHMI	0.059	0.276

Participating institutes

CCQM-K10.2018

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CCQM-K10.2018

MEASURAND Amount fraction of toulene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

Degrees of equivalence represented by D_i = (x_i - x_R_,i) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in nmol mol^-1.

LAB_i	D_i	U_neg,i	U_pos,i
	nmol mol^-1	nmol mol^-1	nmol mol^-1
KRISS	-0.043	0.268
LNE	0.508	0.281
NIST	0.124	0.207
NMISA	0.302	0.224
NPL	0.042	0.218
VNIIM	0.498	0.247
VSL	0.050	0.217
METAS	0.539	0.240
UBA	-0.031	0.141
CHMI	0.189	0.254

Participating institutes

CCQM-K10.2018

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CCQM-K10.2018

MEASURAND Amount fraction of ethylbenzene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

Degrees of equivalence represented by D_i = (x_i - x_R_,i) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in nmol mol^-1.

LAB_i	D_i	U_neg,i	U_pos,i
	nmol mol^-1	nmol mol^-1	nmol mol^-1
KRISS	-0.133	0.243
LNE	0.515	0.277
NIST	0.108	0.214
NMISA	0.362	0.206
NPL	0.001	0.205
VNIIM	0.555	0.284
VSL	0.096	0.231
METAS	0.522	0.418
UBA	-0.148	0.288
CHMI	0.222	0.380

Participating institutes

CCQM-K10.2018

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CCQM-K10.2018

MEASURAND Amount fraction of p-Xylene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

Degrees of equivalence represented by D_i = (x_i - x_R_,i) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in nmol mol^-1.

LAB_i	D_i	U_neg,i	U_pos,i
	nmol mol^-1	nmol mol^-1	nmol mol^-1
KRISS	-0.105	0.293
LNE	0.560	0.292
NIST	0.106	0.229
NMISA	0.584	0.219
NPL	0.048	0.216
VNIIM	0.641	0.300
VSL	0.167	0.278
METAS**	1.192	0.296
UBA**	-0.008	0.218
CHMI**	0.242	0.474

Participating institutes

CCQM-K10.2018

**Reported as a combined value for p-xylene and m-xylene as explained in Section 4.3 of the CCQM-K10.2018 Final report

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CCQM-K10.2018

MEASURAND Amount fraction of m-Xylene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

Degrees of equivalence represented by D_i = (x_i - x_R_,i) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in nmol mol^-1.

LAB_i	D_i	U_neg,i	U_pos,i
	nmol mol^-1	nmol mol^-1	nmol mol^-1
KRISS	-0.119	0.290
LNE	0.595	0.302
NIST	0.111	0.248
NMISA	0.952	0.222
NPL	0.056	0.214
VNIIM	0.700	0.299
VSL	0.177	0.276
METAS**	1.192	0.296
UBA**	-0.008	0.218
CHMI**	0.242	0.474

Participating institutes

CCQM-K10.2018

**Reported as a combined value for p-xylene and m-xylene as explained in Section 4.3 of the CCQM-K10.2018 Final report.

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CCQM-K10.2018

MEASURAND Amount fraction of o-Xylene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

Degrees of equivalence represented by D_i = (x_i - x_R_,i) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in nmol mol^-1.

LAB_i	D_i	U_neg,i	U_pos,i
	nmol mol^-1	nmol mol^-1	nmol mol^-1
KRISS	-0.249	0.282
LNE	0.472	0.251
NIST	0.114	0.245
NMISA	0.690	0.217
NPL	-0.056	0.211
VNIIM	0.565	0.294
VSL	0.043	0.272
METAS	0.617	0.457
UBA	-0.163	0.306
CHMI	0.187	0.411

Participating institutes

CCQM-K10.2018

Comparison

Comparison close

CCQM-K10.2018

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Information & contact
Participants

Metrology area, Sub-field	Chemistry and Biology, Gases
Description	BTEX in Nitrogen
Time of measurements	2018 - 2019
Status	Approved for equivalence

Final Reports of the comparisons	Metrologia 2022 59 Tech. Suppl. 08003
Measurand	Amount-of-substance fractions of benzene, toluene, ethylbenzene, p-xylene, m-xylene and o-xylene in nitrogen 5 nmol mol⁻¹
Transfer device	Gas cylinders

Comparison type	Key Comparison
Consultative Committee	CCQM (Consultative Committee for Amount of Substance)
Conducted by	CCQM (Consultative Committee for Amount of Substance)
Pilot institute	NIST National Institute of Standards and Technology United States
Contact person	Christina Cecelski +13019755185

Pilot laboratory
NIST	National Institute of Standards and Technology, United States, SIM

CHMU/CHMI

Czech Hydrometeorological Institute, Czechia, EURAMET

KRISS

Korea Research Institute of Standards and Science, Korea, Republic of, APMP

LNE	Laboratoire national de métrologie et d'essais, France, EURAMET

METAS

Federal Institute of Metrology, Switzerland, EURAMET

NMISA

National Metrology Institute of South Africa, South Africa, AFRIMETS

NPL	National Physical Laboratory, United Kingdom, EURAMET

UBA	Umweltbundesamt, Federal Environment Agency, Germany, EURAMET

VNIIM

D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET

VSL	VSL, Netherlands, EURAMET

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CCQM-K10.2018

MEASURAND Amount fraction of benzene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

The key comparison reference values x_R,i and their associated standard uncertainty u_R,i are computed as described in Section 3.5 (gravimetric study) and Section 4.4 (comparative study) of the CCQM-K10.2018 Final report.

Lab_i	x_R_,i	u_R_,i
Lab_i	nmol mol^-1	nmol mol^-1
KRISS	5.101	0.102
LNE	5.101	0.102
NIST	5.101	0.102
NMISA	5.101	0.102
NPL	5.101	0.102
VNIIM	5.101	0.102
VSL	5.101	0.102
METAS	5.091	0.042
UBA	5.091	0.042
CHMI	5.091	0.042

The degree of equivalence of laboratory i relative to the key comparison reference value x_R,i is given by a pair of terms, both expressed in nmol mol^-1:

D_i = (x_i - x_R,i) and its expanded uncertainty U_i at a 95 % level of confidence computed as described in Section 3.5.3 (gravimetric study) and Section 4.4.2 (comparative study) of the CCQM-K10.2018 Final report.

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CCQM-K10.2018

MEASURAND Amount fraction of toulene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

Lab_i	x_R_,i	u_R_,i
Lab_i	nmol mol^-1	nmol mol^-1
KRISS	4.907	0.098
LNE	4.907	0.098
NIST	4.907	0.098
NMISA	4.907	0.098
NPL	4.907	0.098
VNIIM	4.907	0.098
VSL	4.907	0.098
METAS	4.951	0.065
UBA	4.951	0.065
CHMI	4.951	0.065

The degree of equivalence of laboratory i relative to the key comparison reference value x_R,i is given by a pair of terms, both expressed in nmol mol^-1:

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CCQM-K10.2018

MEASURAND Amount fraction of ethylbenzene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

Lab_i	x_R_,i	u_R_,i
Lab_i	nmol mol^-1	nmol mol^-1
KRISS	4.656	0.093
LNE	4.656	0.093
NIST	4.656	0.093
NMISA	4.656	0.093
NPL	4.656	0.093
VNIIM	4.656	0.093
VSL	4.656	0.093
METAS	4.628	0.115
UBA	4.628	0.115
CHMI	4.628	0.115

The degree of equivalence of laboratory i relative to the key comparison reference value x_R,i is given by a pair of terms, both expressed in nmol mol^-1:

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CCQM-K10.2018

MEASURAND Amount fraction of p-Xylene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

Lab_i	x_R_,i	u_R_,i
Lab_i	nmol mol^-1	nmol mol^-1
KRISS	4.892	0.098
LNE	4.892	0.098
NIST	4.892	0.098
NMISA	4.892	0.098
NPL	4.892	0.098
VNIIM	4.892	0.098
VSL	4.892	0.098
METAS**	9.808	0.103
UBA**	9.808	0.103
CHMI**	9.808	0.103

**Reported as a combined value for p-xylene and m-xylene as explained in Section 4.3 of the CCQM-K10.2018 Final report

The degree of equivalence of laboratory i relative to the key comparison reference value x_R,i is given by a pair of terms, both expressed in nmol mol^-1:

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CCQM-K10.2018

MEASURAND Amount fraction of m-Xylene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

Lab_i	x_R_,i	u_R_,i
Lab_i	nmol mol^-1	nmol mol^-1
KRISS	4.840	0.097
LNE	4.840	0.097
NIST	4.840	0.097
NMISA	4.840	0.097
NPL	4.840	0.097
VNIIM	4.840	0.097
VSL	4.840	0.097
METAS**	9.808	0.103
UBA**	9.808	0.103
CHMI**	9.808	0.103

**Reported as a combined value for p-xylene and m-xylene as explained in Section 4.3 of the CCQM-K10.2018 Final report.

The degree of equivalence of laboratory i relative to the key comparison reference value x_R,i is given by a pair of terms, both expressed in nmol mol^-1:

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CCQM-K10.2018

MEASURAND Amount fraction of o-Xylene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

Lab_i	x_R_,i	u_R_,i
Lab_i	nmol mol^-1	nmol mol^-1
KRISS	4.840	0.097
LNE	4.840	0.097
NIST	4.840	0.097
NMISA	4.840	0.097
NPL	4.840	0.097
VNIIM	4.840	0.097
VSL	4.840	0.097
METAS	4.763	0.121
UBA	4.763	0.121
CHMI	4.763	0.121

The degree of equivalence of laboratory i relative to the key comparison reference value x_R,i is given by a pair of terms, both expressed in nmol mol^-1:

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MEASURAND Amount fraction of benzene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

x_i measurement value submitted by laboratory i, Lab_i

u_i combined standard uncertainty of x_i

Lab_i	x_i	u_i
Lab_i	nmol mol^-1	nmol mol^-1
KRISS*	5.11	0.10
LNE*	5.60	0.11
NIST*	5.24	0.04
NMISA*	4.80	0.06
NPL*	5.12	0.05
VNIIM*	5.63	0.08
VSL*	5.14	0.05
METAS	6.21	0.36
UBA	5.09	0.02
CHMI	5.15	0.16

*Value is calculated as explained in Section 3.5.2 and Appendix A of the CCQM-K10.2018 Final report.

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CCQM-K10.2018

MEASURAND Amount fraction of toulene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

x_i measured mass fraction reported by laboratory i, Lab_i

u_i combined standard uncertainty of x_i

Lab_i	x_i	u_i
Lab_i	nmol mol^-1	nmol mol^-1
KRISS*	4.86	0.10
LNE*	5.42	0.10
NIST*	5.03	0.04
NMISA*	5.21	0.06
NPL*	4.95	0.05
VNIIM*	5.41	0.08
VSL*	4.96	0.05
METAS	5.49	0.08
UBA	4.92	0.02
CHMI	5.14	0.12

*Value is calculated as explained in Section 3.5.2 and Appendix A of the CCQM-K10.2018 Final report.

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CCQM-K10.2018

MEASURAND Amount fraction of ethylbenzene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

x_i measured mass fraction reported by laboratory i, Lab_i

u_i combined standard uncertainty of x_i

Lab_i	x_i	u_i
Lab_i	nmol mol^-1	nmol mol^-1
KRISS*	4.52	0.08
LNE*	5.17	0.11
NIST*	4.76	0.06
NMISA*	5.02	0.05
NPL*	4.66	0.05
VNIIM*	5.21	0.11
VSL*	4.75	0.07
METAS	5.15	0.07
UBA	4.48	0.02
CHMI	4.85	0.13

*Value is calculated as explained in Section 3.5.2 and Appendix A of the CCQM-K10.2018 Final report.

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CCQM-K10.2018

MEASURAND Amount fraction of p-Xylene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

x_i measured mass fraction reported by laboratory i, Lab_i

u_i combined standard uncertainty of x_i

Lab_i	x_i	u_i
Lab_i	nmol mol^-1	nmol mol^-1
KRISS*	4.79	0.11
LNE*	5.45	0.11
NIST*	5.00	0.06
NMISA*	5.48	0.05
NPL*	4.94	0.05
VNIIM*	5.53	0.12
VSL*	5.06	0.10
METAS**	11.00	0.11
UBA**	9.80	0.07
CHMI**	10.05	0.27

*Value is calculated as explained in Section 3.5.2 and Appendix A of the Final Report.

**Reported as a combined value for p-xylene and m-xylene as explained in Section 4.3 of the CCQM-K10.2018 Final report

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CCQM-K10.2018

MEASURAND Amount fraction of m-Xylene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

x_i measured mass fraction reported by laboratory i, Lab_i

u_i combined standard uncertainty of x_i

Lab_i	x_i	u_i
Lab_i	nmol mol^-1	nmol mol^-1
KRISS*	4.72	0.11
LNE*	5.44	0.12
NIST*	4.95	0.08
NMISA*	5.79	0.06
NPL*	4.90	0.05
VNIIM*	5.54	0.12
VSL*	5.02	0.10
METAS**	11.00	0.11
UBA**	9.80	0.07
CHMI**	10.05	0.27

*Value is calculated as explained in Section 3.5.2 and Appendix A of the CCQM-K10.2018 Final report.

**Reported as a combined value for p-xylene and m-xylene as explained in Section 4.3 of the CCQM-K10.2018 Final report.

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CCQM-K10.2018

MEASURAND Amount fraction of o-Xylene in nitrogen

NOMINAL VALUE 5 nmol mol^-1

x_i measured mass fraction reported by laboratory i, Lab_i

u_i combined standard uncertainty of x_i

Lab_i	x_i	u_i
Lab_i	nmol mol^-1	nmol mol^-1
KRISS*	4.59	0.11
LNE*	5.31	0.08
NIST*	4.95	0.08
NMISA*	5.53	0.05
NPL*	4.78	0.05
VNIIM*	5.41	0.12
VSL*	4.88	0.10
METAS	5.38	0.10
UBA	4.60	0.03
CHMI	4.95	0.15

*Value is calculated as explained in Section 3.5.2 and Appendix A of the CCQM-K10.2018 Final report.

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