Comparison Display

CCQM-K131

MEASURAND : Mass fraction of PAHs in acetonitrile

Benz[a]anthracene (BaA)

Degrees of equivalence, D_i and expanded uncertainty at a 95 % level of confidence U_i, expressed in µg/g. The ratio %d_i= D_i / x_R and its expanded uncertainty %U_i= U_i/ x_R, both in %, are also given.

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CCQM-K131

MEASURAND : Mass fraction of PAHs in acetonitrile

Benzo[a]pyrene (BaP)

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CCQM-K131

MEASURAND : Mass fraction of PAHs in acetonitrile

Naphtalene (Nap)

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CCQM-K131

MEASURAND : Mass fraction of PAHs in acetonitrile

Benz[a]anthracene (BaA)

Degrees of equivalence, offset D_i and expanded uncertainty at a 95 % level of confidence U_i, expressed in µg/g. The ratio %d_i = D_i / x_R and its expanded uncertainty %U_i = U_i / x_R; both in %, are also given.

Results are presented under A4 printable format in Summary Results.

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CCQM-K131

MEASURAND : Mass fraction of PAHs in acetonitrile

Benzo[a]pyrene (BaP)

Results are presented under A4 printable format in Summary Results.

print out

CCQM-K131

MEASURAND : Mass fraction of PAHs in acetonitrile

Naphtalene (Nap)

Results are presented under A4 printable format in Summary Results.

Comparison

Comparison close

CCQM-K131

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Information & contact
Participants

Metrology area, Sub-field	Chemistry and Biology, Organics
Description	Mass fraction of organic calibration solution
Time of measurements	2015
Status	Approved for equivalence

Final Reports of the comparisons	Metrologia, 2019, 56, Tech. Suppl., 08003
References	CCQM-K131 registration and progress form
Measurand	Mass fraction of PAHs in acetonitrile in ng/g
Transfer device	Ampouled solution available at the NIST

Comparison type	Key Comparison
Consultative Committee	CCQM (Consultative Committee for Amount of Substance)
Conducted by	CCQM (Consultative Committee for Amount of Substance)
Comments	This study will demonstrate a laboratory’s capabilities in determining mass fraction of organic compounds with molecular mass of 100 Da to 500 Da in a multicomponent solution ranging from 100 µg/kg to 100 mg/kg. This comparison is a repeat of CCQM-K38. Results published on 19 December 2018 PAHs in acetonitrile
Pilot institute	NIST National Institute of Standards and Technology United States
Contact person	S. Wise +1 301 975 3112

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

BAM	Bundesanstalt für Materialforschung und -prüfung, Germany, EURAMET

BVL	Bundesamt für Verbraucherschutz und Lebensmittelsicherheit, Germany, EURAMET

CENAM

Centro Nacional de Metrologia, Mexico, SIM

EXHM/GCSL-EIM

National Laboratory of Chemical Metrology/GCSL - Hellenic Institute of Metrology, Greece, EURAMET

GL	Government Laboratory, Hong Kong, China, APMP

HSA	Health Science Authority, Singapore, APMP

INMETRO

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

INRIM

Istituto Nazionale di Ricerca Metrologica, Italy, EURAMET

KRISS

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

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

NIM	National Institute of Metrology, China, APMP

NMIJ AIST

National Metrology Institute of Japan, Japan, APMP

NMISA

National Metrology Institute of South Africa, South Africa, AFRIMETS

UME	TÜBITAK Ulusal Metroloji Enstitüsü, Türkiye, EURAMET

VNIIM

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

VSL	VSL, Netherlands, EURAMET

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CCQM-K131

MEASURAND : Mass fraction of PAHs in acetonitrile

Benz[a]anthracene (BaA)

The key comparison reference value, x_R, is calculated as the weighted mean of the comparison results (DerSimonian-Laird variance-weighted mean, NMISA excepted) with an associated standard uncertainty u_R. The expanded uncertainty of the key comparison reference value is designated as U_R.

The degree of equivalence of laboratory i relative to the key comparison reference value is given by a pair of terms, both expressed in µg/g:
D_i = (x_i - x_R) and it expanded uncertainty at a 95 % confidence level, U_i, with U_i = 2(u_Lab _i² + u_R²-2cov(x_i, x_R))^1/2, where cov represents the covariance. The ratio %d_i= D_i/ x_R and its expanded uncertainty %U_i = U_i / x_R; both in %, are also given.

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CCQM-K131

MEASURAND : Mass fraction of PAHs in acetonitrile

Benzo[a]pyrene (BaP)

The key comparison reference value, x_R, is calculated as the weighted mean of the comparison results (DerSimonian-Laird variance-weighted mean, BVL and NMISA excepted) with an associated standard uncertainty u_R. The expanded uncertainty of the key comparison reference value is designated as U_R.

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CCQM-K131

MEASURAND : Mass fraction of PAHs in acetonitrile

Naphtalene (Nap)

The key comparison reference value, x_R, is calculated as the weighted mean of the comparison results (DerSimonian-Laird variance-weighted mean, INMETRO excepted) with an associated standard uncertainty u_R. The expanded uncertainty of the key comparison reference value is designated as U_R.

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CCQM-K131

MEASURAND : Mass fraction of PAHs in acetonitrile

x_i : result of measurement carried out by laboratory i
u_i : combined standard uncertainty of x_i
k : expansion coefficient
U_{Lab i} : expanded uncertainty of x_i at a 95 % level of confidence (U_Labi = k x u_i)