Comparison Display

CCQM-K184

MEASURAND Mass fraction of fluoranthene

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 μg/kg.

Fluoranthene

D_i / （μg/kg）

Participating institutes

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CCQM-K184

MEASURAND Mass fraction of benzo[a]pyrene

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 μg/kg.

Benzo[a]pyrene

D_i / （μg/kg）

Participating institutes

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CCQM-K184

MEASURAND Mass fraction of benzo[ghi]perylene

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 μg/kg.

Benzo[ghi]perylene

D_i / （μg/kg）

Participating institutes

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CCQM-K184

MEASURAND Mass fraction of phenanthrene

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 μg/kg.

Phenanthrene

D_i / （μg/kg）

Participating institutes

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CCQM-K184

MEASURAND Mass fraction of fluoranthene

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 μg/kg.

LAB_i	D_i	U_neg,i	U_pos,i
	μg/kg	μg/kg	μg/kg
INM (CO)	-1294	326
CENAM	-1071	365
INTI	-914	387
IH-LQPM	-302	592
GL	-214	408
NIST	-184	347
METAS	-142	347
UME	-131	382
INMETRO	-76	345
NIMT	-37	385
LNE	-17	367
LGC	-15	349
NMIA	-14	349
NIM	105	369
VNIIM	176	391
BAM	224	367
KRISS	288	347

Participating institutes

CCQM-K184

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CCQM-K184

MEASURAND Mass fraction of benzo[a]pyrene

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 μg/kg.

LAB_i	D_i	U_neg,i	U_pos,i
	μg/kg	μg/kg	μg/kg
INM (CO)	-345	147
INTI	-336	176
IH-LQPM	-259	186
LGC	-232	142
CENAM	144	160
NIST	-107	162
UME	-64	154
METAS	-53	149
KRISS	-35	153
GL	-21	223
NMIA	-15	152
NIM	-14	151
VNIIM	13	154
LNE	76	155
INMETRO	90	146
BAM	120	162

Participating institutes

CCQM-K184

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CCQM-K184

MEASURAND Mass fraction of benzo[ghi]perylene

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 μg/kg.

LAB_i	D_i	U_neg,i	U_pos,i
	μg/kg	μg/kg	μg/kg
INM (CO)	-320	65
INTI	-260	101
IH-LQPM	-233	143
LGC	-203	63
NIMT	-203	82
CENAM	-58	107
INMETRO	-47	71
KRISS	-40	73
NMIA	-34	94
UME	-12	120
METAS	-9	74
BAM	-4	82
NIM	3	72
NIST	23	73
LNE	31	76
VNIIM	51	88
GL	65	91

Participating institutes

CCQM-K184

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CCQM-K184

MEASURAND Mass fraction of phenanthrene

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 μg/kg.

LAB_i	D_i	U_neg,i	U_pos,i
	μg/kg	μg/kg	μg/kg
INM (CO)	-1854	538
CENAM	-1695	562
INTI	-1001	558
IH-LQPM	-800	683
NIMT	-346	606
LNE	-326	549
INMETRO	-144	541
UME	-53	562
NMIA	-31	558
METAS	-19	549
NIST	-8	550
NIM	144	570
VNIIM	340	576
BAM	430	559

Participating institutes

CCQM-K184

Comparison

Comparison close

CCQM-K184

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Information & contact
Participants

Metrology area, Sub-field	Chemistry and Biology, Organics
Description	Low-polarity analytes in abiotic matrix: PAHs in sediment
Time of measurements	2023 - 2024
Status	Approved for equivalence

Final Reports of the comparisons	CCQM-K184 Final report 2025 155pp
Measurand	Mass fraction of fluoranthene, benzo[a]pyrene, benzo[ghi]perylene, phenanthrene in sediment in µg/kg

Comparison type	Key Comparison
Consultative Committee	CCQM (Consultative Committee for Amount of Substance)
Conducted by	CCQM (Consultative Committee for Amount of Substance)
Comments	Polycyclic aromatic hydrocarbons (PAHs) are a class of carcinogenic organic compounds formed from the incomplete combustion of organic matter, primarily originating from sources such as industrial emissions, vehicle exhaust, and tobacco smoke. Due to their hydrophobic nature, PAHs tend to accumulate in sediments and are widely used as indicators of environmental pollution. In April 2023, the CCQM Organic Analysis Working Group (OAWG) decided to conduct a track A key comparison/pilot study (CCQM-K184/P235) low-polarity analytes in abiotic matrix: PAHs in sediment. This study aligns with the OAWG strategy document for 2021-2030, which prioritizes services supporting the environmental sector, particularly in the category of "analytes in abiotic matrices". By participating in CCQM-K184, National Metrology Institutes (NMIs) and Designated Institutes (DIs) will demonstrate their capabilities in measuring low-polarity contaminants (with molecular masses ranging from 170 g/mol to 500 g/mol and pKow < -2) in an abiotic dried matrix, covering a mass fraction range from 100 µg/kg to 1,000,000 µg/kg. Successful participation in this comparison will serve as essential evidence for NMIs and DIs to extend or support their Measurement Capabilities (CMCs) in this area. Results published 04 February 2026
Pilot institute	NIM National Institute of Metrology China
Contact person	Hua Tang 861064524723

Pilot laboratory
NIM	National Institute of Metrology, China, APMP

BAM	Bundesanstalt für Materialforschung und -prüfung, Germany, EURAMET

CENAM

Centro Nacional de Metrologia, Mexico, SIM

GL	Government Laboratory, Hong Kong, China, APMP

IH-LQPM

Instituto Hidrográfico - Laboratório de Química e Poluição do Meio Marinho, Portugal, EURAMET

INM (CO)

Instituto Nacional de Metrología de Colombia, Colombia, SIM

INMETRO

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

INTI	Instituto Nacional de Tecnologia Industrial, Argentina, SIM

KRISS

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

LGC	Laboratory of the Government Chemist, United Kingdom, EURAMET

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

METAS

Federal Institute of Metrology, Switzerland, EURAMET

NIMT	National Institute of Metrology (Thailand), Thailand, APMP

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

NMIA	National Measurement Institute, Australia, Australia, APMP

UME	TÜBITAK Ulusal Metroloji Enstitüsü, Türkiye, EURAMET

VNIIM

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

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CCQM-K184

MEASURAND Mass fraction of fluoranthene

The key comparison reference value x_R and its associated standard uncertainty u_R are computed using the Hierarchical Bayes approach, which incorporates an estimate for the dark uncertainty τ. The calculation excluded the results from CENAM, IH-LQPM, INM (CO), and INTI as explained on page 22 of the CCQM-K184 Final report.

x_R = 2314 μg/kg u_R = 49 μg/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 μg/kg:

D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence where U_i includes the dark uncertainty τ.

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CCQM-K184

MEASURAND Mass fraction of benzo[a]pyrene

The key comparison reference value x_R and its associated standard uncertainty u_R are computed using the Hierarchical Bayes approach, which incorporates an estimate for the dark uncertainty τ. The calculation excluded the results from CENAM, IH-LQPM, INM (CO), INTI, and LGC as explained on page 22 of the CCQM-K184 Final report.

x_R = 763 μg/kg u_R = 23 μg/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 μg/kg:

D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence where U_i includes the dark uncertainty τ.

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CCQM-K184

MEASURAND Mass fraction of benzo[ghi]perylene

The key comparison reference value x_R and its associated standard uncertainty u_R are computed using the Hierarchical Bayes approach, which incorporates an estimate for the dark uncertainty τ. The calculation excluded the results from CENAM, IH-LQPM, INM (CO), INTI, and LGC as explained on page 22 of the CCQM-K184 Final report.

x_R = 677 μg/kg u_R = 12 μg/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 μg/kg:

D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence where U_i includes the dark uncertainty τ.

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CCQM-K184

MEASURAND Mass fraction of phenanthrene

x_R = 2581 μg/kg u_R = 83 μg/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 μg/kg:

D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence where U_i includes the dark uncertainty τ.

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CCQM-K184

MEASURAND Mass fraction of fluoranthene

x_i measured value submitted by institute i, Lab_i

u_i combined standard uncertainty of x_i

Lab_i	x_i	u_i
Lab_i	µg/kg	µg/kg
INM (CO)	1021	33
CENAM	1243	95
INTI	1400	110
IH-LQPM	2012	250
GL	2100	130
NIST	2130	58
METAS	2172	66
UME	2183	103
INMETRO	2238	63
NIMT	2277	105
LNE	2297	82
LGC	2299	68
NMIA	2300	66
NIM	2419	90
VNIIM	2490	105
BAM	2538	90
KRISS	2602	51

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CCQM-K184

MEASURAND Mass fraction of benzo[a]pyrene

x_i measured value submitted by institute i, Lab_i

u_i combined standard uncertainty of x_i

Lab_i	x_i	u_i
Lab_i	µg/kg	µg/kg
INM (CO)	419	20
INTI	427	55
IH-LQPM	504	64
LGC	531	17
NIST	656	41
UME	699	33
METAS	710	31
KRISS	728	32
GL	742	88
NMIA	748	28
NIM	749	23
VNIIM	776	32
LNE	839	34
INMETRO	853	27
BAM	883	41
CENAM	907	44

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CCQM-K184

MEASURAND Mass fraction of benzo[ghi]perylene

x_i measured value submitted by institute i, Lab_i

u_i combined standard uncertainty of x_i

Lab_i	x_i	u_i
Lab_i	µg/kg	µg/kg
INM (CO)	357	16
INTI	417	44
IH-LQPM	444	68
LGC	474	14
NIMT	474	31
CENAM	619	47
INMETRO	630	23
KRISS	637	25
NMIA	643	39
UME	665	54
METAS	668	26
BAM	673	31
NIM	680	24
NIST	700	24
LNE	708	27
VNIIM	728	35
GL	742	37

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CCQM-K184

MEASURAND Mass fraction of phenanthrene

x_i measured value submitted by institute i, Lab_i

u_i combined standard uncertainty of x_i

Lab_i	x_i	u_i
Lab_i	µg/kg	µg/kg
INM (CO)	727	54
CENAM	885	105
INTI	1580	108
IH-LQPM	1781	221
NIMT	2235	162
LNE	2255	69
INMETRO	2437	58
UME	2528	114
NMIA	2550	91
METAS	2562	74
NIST	2573	50
NIM	2724	111
VNIIM	2920	111
BAM	3010	97

KCDB

CIPM MRA

CLASSIFICATION OF SERVICES

Key and supplementary comparisons - Print out