Comparison Display

CCQM-K172

MEASURAND Specific Adsorption of Ar on zeolite at P/Po = 0.0001

Degrees of equivalence represented by D_i = (x_I - x_R) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in mol/kg.

Specific adsorption of Ar at P/Po=0.0001

D_i / mol/kg

Participating institutes

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CCQM-K172

MEASURAND Specific Adsorption of Ar on zeolite at P/Po = 0.001

Degrees of equivalence represented by D_i = (x_I - x_R) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in mol/kg.

Specific adsorption of Ar at P/Po=0.001

D_i / mol/kg

Participating institutes

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CCQM-K172

MEASURAND Specific Adsorption of Ar on zeolite at P/Po = 0.01

Degrees of equivalence represented by D_i = (x_I - x_R) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in mol/kg.

Specific adsorption of Ar at P/Po=0.01

D_i / mol/kg

Participating institutes

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CCQM-K172

MEASURAND Specific Adsorption of Ar on zeolite at P/Po = 0.1

Degrees of equivalence represented by D_i = (x_I - x_R) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in mol/kg.

Specific adsorption of Ar at P/Po=0.1

D_i / mol/kg

Participating institutes

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CCQM-K172

MEASURAND BET specific surface area

Degrees of equivalence represented by D_i = (x_I - x_R) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in m²/g.

BET Specific surface area

D_i / m²/g

Participating institutes

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CCQM-K172

MEASURAND Specific Adsorption of Ar on zeolite at P/Po = 0.0001

Degrees of equivalence represented by D_i = (x_I - x_R) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in mol/kg.

LAB_i	D_i	U_neg,i	U_pos,i
	mol/kg	mol/kg	mol/kg
UME	-0.13	0.13
INMETRO	-0.06	0.13
VNIIM	0.01	0.10
BAM	0.09	0.10
NIM	0.11	0.15

Participating institutes

CCQM-K172

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CCQM-K172

MEASURAND Specific Adsorption of Ar on zeolite at P/Po = 0.001

Degrees of equivalence represented by D_i = (x_I - x_R) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in mol/kg.

LAB_i	D_i	U_neg,i	U_pos,i
	mol/kg	mol/kg	mol/kg
INMETRO	-0.54	0.26
BAM	-0.11	0.12
VNIIM	-0.06	0.12
NIM	0.04	0.14
UME	0.12	0.19

Participating institutes

CCQM-K172

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CCQM-K172

MEASURAND Specific Adsorption of Ar on zeolite at P/Po = 0.01

Degrees of equivalence represented by D_i = (x_I - x_R) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in mol/kg.

LAB_i	D_i	U_neg,i	U_pos,i
	mol/kg	mol/kg	mol/kg
INMETRO	-0.64	0.31
BAM	-0.11	0.13
VNIIM	-0.02	0.13
UME	0.02	0.26
NIM	0.10	0.17

Participating institutes

CCQM-K172

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CCQM-K172

MEASURAND Specific Adsorption of Ar on zeolite at P/Po = 0.1

Degrees of equivalence represented by D_i = (x_I - x_R) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in mol/kg.

LAB_i	D_i	U_neg,i	U_pos,i
	mol/kg	mol/kg	mol/kg
INMETRO	-0.57	0.57
BAM	-0.13	0.16
UME	-0.02	0.33
VNIIM	-0.01	0.16
NIM	0.15	0.19

Participating institutes

CCQM-K172

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CCQM-K172

MEASURAND BET specific surface area

Degrees of equivalence represented by D_i = (x_I - x_R) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in m²/g.

LAB_i	D_i	U_neg,i	U_pos,i
	m²/g	m²/g	m²/g
INMETRO	-49.7	37.3
BAM	-7.7	12.1
VNIIM	-2.9	12.3
UME	-0.8	31.1
NIM	11.3	14.5

Participating institutes

CCQM-K172

Comparison

Comparison close

CCQM-K172

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Information & contact
Participants

Metrology area, Sub-field	Chemistry and Biology, Surface
Description	Specific Adsorption of Ar on zeolite
Time of measurements	2020 - 2021
Status	Approved for equivalence

Final Reports of the comparisons	Metrologia 2023 60 Tech. Supp. 08007
References	CCQM-K172 Technical protocol
Measurand	Specific adsorption (1-20) mol/kg; (500-1500) m²/g
Transfer device	Bottle containing 4 g of zeolite

Comparison type	Key Comparison
Consultative Committee	CCQM (Consultative Committee for Amount of Substance)
Conducted by	CCQM (Consultative Committee for Amount of Substance)
Comments	Results published on 17 February 2023
Pilot institute	VNIIM D.I. Mendeleyev Institute for Metrology, Rosstandart Russian Federation
Contact person	EGOR SOBINA 89126576832

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

BAM	Bundesanstalt für Materialforschung und -prüfung, Germany, EURAMET

INMETRO

Instituto Nacional de Metrologia, Qualidade e Tecnologia, Brazil, SIM

NIM	National Institute of Metrology, China, APMP

UME	TÜBITAK Ulusal Metroloji Enstitüsü, Türkiye, EURAMET

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CCQM-K172

MEASURAND Specific Adsorption of Ar on zeolite at P/Po = 0.0001

The key comparison reference value x_R and its associated standard uncertainty u_R are calculated as the mean of the reported values of specific adsorption of Ar at P/Po=0.0001:

x_R = 1.480 mol/kg u_R = 0.034 mol/kg

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

D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence where U_i = (U_Lab_i ² +2u_R²)^1/2

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CCQM-K172

MEASURAND Specific Adsorption of Ar on zeolite at P/Po = 0.001

The key comparison reference value x_R and its associated standard uncertainty u_R are calculated as the mean of the reported values of specific adsorption of Ar at P/Po=0.0001, excluding INMETRO results:

x_R = 7.248 mol/kg u_R = 0.051 mol/kg

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

D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence where U_i = (U_Lab_i ² +2u_R²)^1/2

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CCQM-K172

MEASURAND Specific Adsorption of Ar on zeolite at P/Po = 0.01

x_R = 9.048 mol/kg u_R = 0.044 mol/kg

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

D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence where U_i = (U_Lab_i ² +2u_R²)^1/2

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CCQM-K172

MEASURAND Specific Adsorption of Ar on zeolite at P/Po = 0.1

x_R = 9.868 mol/kg u_R = 0.058 mol/kg

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

D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence where U_i = (U_Lab_i ² +2u_R²)^1/2

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CCQM-K172

MEASURAND BET specific surface area

The key comparison reference value x_R and its associated standard uncertainty u_R are calculated as the mean of the participants' reported values of BET specific surface area, excluding INMETRO results:

x_R = 793.7 m²/g u_R = 4.0 m²/g

The degree of equivalence of laboratory i relative to the key comparison reference value x_R is given by a pair of terms, both expressed in m²/g:

D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence where U_i = (U_Lab_i ² +2u_R²)^1/2

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CCQM-K172

MEASURAND Specific Adsorption of Ar on zeolite at P/Po = 0.0001

x_i measurement value reported by laboratory i, Lab_i

u_i combined standard uncertainty of x_i

k_Labi coverage factor reported by laboratory i,

U_Lab_i expanded uncertainty of x_i at 95 % level of confidence where U_i = k_Labiu_i

Lab_i	x_i	u_i	k_Lab_i	U_Lab_i
	mol/kg	mol/kg		mol/kg
UME	1.320	0.045	2	0.090
INMETRO	1.390	0.047	2.57	0.120
VNIIM	1.460	0.020	2	0.040
BAM	1.540	0.020	2	0.040
NIM	1.560	0.060	2	0.120

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CCQM-K172

MEASURAND Specific Adsorption of Ar on zeolite at P/Po = 0.001

x_i measurement value reported by laboratory i, Lab_i

u_i combined standard uncertainty of x_i

k_Labi coverage factor reported by laboratory i,

U_Lab_i expanded uncertainty of x_i at 95 % level of confidence where U_i = k_Labiu_i

Lab_i	x_i	u_i	k_Lab_i	U_Lab_i
	mol/kg	mol/kg		mol/kg
INMETRO	6.710	0.121	2.31	0.280
BAM	7.140	0.035	2	0.070
VNIIM	7.190	0.035	2	0.070
NIM	7.290	0.050	2	0.100
UME	7.370	0.080	2	0.160

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CCQM-K172

MEASURAND Specific Adsorption of Ar on zeolite at P/Po = 0.01

x_i measurement value reported by laboratory i, Lab_i

u_i combined standard uncertainty of x_i

k_Labi coverage factor reported by laboratory i,

U_Lab_i expanded uncertainty of x_i at 95 % level of confidence where U_i = k_Labiu_i

Lab_i	x_i	u_i	k_Lab_i	U_Lab_i
	mol/kg	mol/kg		mol/kg
INMETRO	8.410	0.150	2.26	0.340
BAM	8.940	0.050	2	0.100
VNIIM	9.030	0.045	2	0.090
UME	9.070	0.120	2	0.240
NIM	9.150	0.075	2	0.150

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CCQM-K172

MEASURAND Specific Adsorption of Ar on zeolite at P/Po = 0.1

x_i measurement value reported by laboratory i, Lab_i

u_i combined standard uncertainty of x_i

k_Labi coverage factor reported by laboratory i,

U_Lab_i expanded uncertainty of x_i at 95 % level of confidence where U_i = k_Labi u_i

Lab_i	x_i	u_i	k_Lab_i	U_Lab_i
	mol/kg	mol/kg		mol/kg
INMETRO	9.300	0.278	2.16	0.600
BAM	9.740	0.055	2	0.110
UME	9.850	0.155	2	0.310
VNIIM	9.860	0.055	2	0.110
NIM	10.020	0.075	2	0.150

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CCQM-K172

MEASURAND BET specific surface area

x_i measurement value reported by laboratory i, Lab_i

u_i combined standard uncertainty of x_i

k_Labi coverage factor reported by laboratory i,

U_Lab_i expanded uncertainty of x_i at 95 % level of confidence where U_i = k_Labi u_i

Lab_i	x_i	u_i	k_Lab_i	U_Lab_i
	m²/g	m²/g		m²/g
INMETRO	744.0	18.2	2.14	39.0
BAM	786.0	4.5	2	9.0
VNIIM	790.8	4.7	2	9.3
UME	792.9	15.0	2	30.0
NIM	805.0	6.0	2	12.0

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Key and supplementary comparisons - Print out