Comparison Display

CIPM MRA PARTICIPANTS

The KCDB - the BIPM key comparison database – supports the CIPM MRA. The KCDB contains information on the internationally recognized Calibration and Measurement Capabilities (CMCs) for services available from the participating institutes, and the key and supplementary comparisons supporting these CMCs.

All data listed in the KCDB have been reviewed and approved within the CIPM Mutual Recognition Arrangement

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CIPM MRA PARTICIPANTS

CMC statistics

CMC statistics

Comparison statistics

CCQM-K158

MEASURAND Copper in polished rice flour

NOMINAL VALUE 0.5 mg/kg - 5 mg/kg

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 mg/kg.

Copper in rice flour

D_i / mg/kg

Participating institutes

*U_i for this participant was estimated after summing in quadrature the participant's reported uncertainty value and the dark uncertainty (tau) associated with the key comparison reference value (KCRV) because estimation using the reported uncertainty value alone results in nonequivalence with the KCRV.

CCQM-K158

MEASURAND Mercury in polished rice flour

NOMINAL VALUE 0.1 mg/kg - 5 mg/kg

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 mg/kg.

Mercury in rice flour

D_i / mg/kg

Participating institutes

*U_i for this participant was estimated after summing in quadrature the participant's reported uncertainty value and the dark uncertainty (tau) associated with the key comparison reference value (KCRV) because estimation using the reported uncertainty value alone results in nonequivalence with the KCRV.

Enlarged graph
Graph_Hg_CCQM-K158

CCQM-K158

MEASURAND Potassium in polished rice flour

NOMINAL VALUE 100 mg/kg - 1000 mg/kg

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 mg/kg.

Potassium in rice flour

D_i / mg/kg

Participating institutes

*U_i for this participant was estimated after summing in quadrature the participant's reported uncertainty value and the dark uncertainty (tau) associated with the key comparison reference value (KCRV) because estimation using the reported uncertainty value alone results in nonequivalence with the KCRV.

CCQM-K158

MEASURAND Sodium in polished rice flour

NOMINAL VALUE 2 mg/kg - 10 mg/kg

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 mg/kg.

Sodium in rice flour

D_i / mg/kg

Participating institutes

*U_i for this participant was estimated after summing in quadrature the participant's reported uncertainty value and the dark uncertainty (tau) associated with the key comparison reference value (KCRV) because estimation using the reported uncertainty value alone results in nonequivalence with the KCRV.

CCQM-K158

MEASURAND Lead in polished rice flour

NOMINAL VALUE 0.1 mg/kg - 1 mg/kg

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 mg/kg.

Lead in rice flour

D_i / mg/kg

Participating institutes

*U_i for this participant was estimated after summing in quadrature the participant's reported uncertainty value and the dark uncertainty (tau) associated with the key comparison reference value (KCRV) because estimation using the reported uncertainty value alone results in nonequivalence with the KCRV.

CCQM-K158

MEASURAND Antimony in polished rice flour

NOMINAL VALUE 0.5 mg/kg - 5 mg/kg

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 mg/kg.

Antimony in rice flour

D_i / mg/kg

Participating institutes

*U_i for this participant was estimated after summing in quadrature the participant's reported uncertainty value and the dark uncertainty (tau) associated with the key comparison reference value (KCRV) because estimation using the reported uncertainty value alone results in nonequivalence with the KCRV.

CCQM-K158

MEASURAND Total arsenic in polished rice flour

NOMINAL VALUE > 0.02 mg/kg

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 mg/kg.

Total arsenic in rice flour

D_i / mg/kg

Participating institutes

*U_i for this participant was estimated after summing in quadrature the participant's reported uncertainty value and the dark uncertainty (tau) associated with the key comparison reference value (KCRV) because estimation using the reported uncertainty value alone results in nonequivalence with the KCRV.

CCQM-K158

MEASURAND Inorganic arsenic in polished rice flour

NOMINAL VALUE > 0.02 mg/kg

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 mg/kg.

Inorganic arsenic in rice flour

D_i / mg/kg

Participating institutes

*U_i for this participant was estimated after summing in quadrature the participant's reported uncertainty value and the dark uncertainty (tau) associated with the key comparison reference value (KCRV) because estimation using the reported uncertainty value alone results in nonequivalence with the KCRV.

CCQM-K158

MEASURAND Copper in polished rice flour

NOMINAL VALUE 0.5 mg/kg - 5 mg/kg

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 mg/kg.

	LAB_i	D_i	U_neg,i	U_pos,i
		mg/kg	mg/kg	mg/kg
	NIS*	-0.406	0.213
	INTI*	-0.291	0.229
	NIMT	-0.023	0.072
	HSA	0.007	0.070
	KRISS	0.0188	0.0625
	NMIJ	0.029	0.070
	LATU	0.036	0.072
	NMISA	0.040	0.089
	MIRS/IJS/F-2,O-2	0.145	0.156

Participating institutes

CCQM-K158

*U_i for this participant was estimated after summing in quadrature the participant's reported uncertainty value and the dark uncertainty (tau) associated with the key comparison reference value (KCRV) because estimation using the reported uncertainty value alone results in nonequivalence with the KCRV.

CCQM-K158

MEASURAND Mercury in polished rice flour

NOMINAL VALUE 0.1 mg/kg - 5 mg/kg

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 mg/kg.

	LAB_i	D_i	U_neg,i	U_pos,i
		mg/kg	mg/kg	mg/kg
	INTI	-0.040	0.080
	MIRS/IJS/F-2,O-2	-0.038	0.040
	NMISA*	-0.023	0.040
	GL	-0.005	0.028
	NMIA	-0.001	0.024
	NIM	0.0042	0.0172
	HSA	0.0050	0.0137
	LATU	0.0122	0.0205
	NIMT*	0.0182	0.0398
	KRISS*	0.0228	0.0396
	NIS*	0.6372	0.0831

Participating institutes

CCQM-K158

*U_i for this participant was estimated after summing in quadrature the participant's reported uncertainty value and the dark uncertainty (tau) associated with the key comparison reference value (KCRV) because estimation using the reported uncertainty value alone results in nonequivalence with the KCRV.

CCQM-K158

MEASURAND Potassium in polished rice flour

NOMINAL VALUE 100 mg/kg - 1000 mg/kg

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 mg/kg.

	LAB_i	D_i	U_neg,i	U_pos,i
		mg/kg	mg/kg	mg/kg
	NIMT*	-72.6	43.5
	NIS	-70.7	77.9
	NMISA*	-28.6	25.2
	MIRS/IJS/F-2,O-2	-20.6	34.1
	PTB	-2.3	6.7
	KRISS	2.0	4.2
	INM (CO)	5.2	23.6
	NMIJ	5.6	15.2
	LATU	10.4	14.6

Participating institutes

CCQM-K158

*U_i for this participant was estimated after summing in quadrature the participant's reported uncertainty value and the dark uncertainty (tau) associated with the key comparison reference value (KCRV) because estimation using the reported uncertainty value alone results in nonequivalence with the KCRV.

CCQM-K158

MEASURAND Sodium in polished rice flour

NOMINAL VALUE 2 mg/kg - 10 mg/kg

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 mg/kg.

	LAB_i	D_i	U_neg,i	U_pos,i
		mg/kg	mg/kg	mg/kg
	NIS*	-1.74	0.27
	MIRS/IJS/F-2,O-2	-0.15	0.29
	KRISS	-0.02	0.33
	NMIJ	0.031	0.162
	NMISA	0.05	0.24
	NIMT*	3.35	0.87

Participating institutes

CCQM-K158

*U_i for this participant was estimated after summing in quadrature the participant's reported uncertainty value and the dark uncertainty (tau) associated with the key comparison reference value (KCRV) because estimation using the reported uncertainty value alone results in nonequivalence with the KCRV.

CCQM-K158

MEASURAND Lead in polished rice flour

NOMINAL VALUE 0.1 mg/kg - 1 mg/kg

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 mg/kg.

	LAB_i	D_i	U_neg,i	U_pos,i
		mg/kg	mg/kg	mg/kg
	NMISA*	-0.0596	0.0372
	INM (CO)*	-0.0336	0.0460
	METAS*	-0.0186	0.0382
	MIRS/IJS/F-2,O-2	-0.0126	0.0154
	GL	-0.0016	0.0099
	NMIJ	-0.0016	0.0085
	NIMT	-0.0016	0.0085
	HSA	0.0004	0.0105
	LATU	0.0014	0.0085
	KRISS	0.0024	0.0109
	PTB	0.0024	0.0073
	NIS	0.0034	0.0379
	NIM	0.0044	0.0072
	NMIA*	0.0134	0.0383
	INTI*	0.0254	0.0412
	INMETRO*	0.0284	0.0386

Participating institutes

CCQM-K158

*U_i for this participant was estimated after summing in quadrature the participant's reported uncertainty value and the dark uncertainty (tau) associated with the key comparison reference value (KCRV) because estimation using the reported uncertainty value alone results in nonequivalence with the KCRV.

CCQM-K158

MEASURAND Antimony in polished rice flour

NOMINAL VALUE 0.5 mg/kg - 5 mg/kg

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 mg/kg.

	LAB_i	D_i	U_neg,i	U_pos,i
		mg/kg	mg/kg	mg/kg
	NIMT*	-0.0743	0.0425
	MIRS/IJS/F-2,O-2*	-0.0673	0.0638
	INTI	-0.0143	0.0725
	GL	-0.0063	0.0358
	NMIA	-0.0023	0.0340
	KRISS	-0.0017	0.0081
	HSA	0.0037	0.0332
	NMIJ	0.0084	0.0114

Participating institutes

CCQM-K158

*U_i for this participant was estimated after summing in quadrature the participant's reported uncertainty value and the dark uncertainty (tau) associated with the key comparison reference value (KCRV) because estimation using the reported uncertainty value alone results in nonequivalence with the KCRV.

CCQM-K158

MEASURAND Total arsenic in polished rice flour

NOMINAL VALUE > 0.02 mg/kg

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 mg/kg.

	LAB_i	D_i	U_neg,i	U_pos,i
		mg/kg	mg/kg	mg/kg
	NIMT*	-0.0134	0.0041
	METAS*	-0.0094	0.0060
	MIRS/IJS/F-2,O-2	-0.0027	0.0072
	LGC	-0.0010	0.0027
	NIM	-0.0004	0.0042
	NMIJ	-0.0001	0.0041
	NMIA	0.0003	0.0058
	KRISS	0.0006	0.0139
	LATU	0.0006	0.0041
	HSA	0.0008	0.0040
	NRC	0.0011	0.0040
	GL	0.0016	0.0055
	INTI	0.0030	0.0114

Participating institutes

CCQM-K158

*U_i for this participant was estimated after summing in quadrature the participant's reported uncertainty value and the dark uncertainty (tau) associated with the key comparison reference value (KCRV) because estimation using the reported uncertainty value alone results in nonequivalence with the KCRV.

CCQM-K158

MEASURAND Inorganic arsenic in polished rice flour

NOMINAL VALUE > 0.02 mg/kg

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 mg/kg.

	LAB_i	D_i	U_neg,i	U_pos,i
		mg/kg	mg/kg	mg/kg
	NRC*	-0.0290	0.0206
	NIMT*	-0.0093	0.0224
	GL	-0.0014	0.0076
	HSA	-0.0007	0.0058
	LGC	-0.0003	0.0035
	NMIJ	0.0004	0.0023
	NIM	0.0036	0.0032

Participating institutes

CCQM-K158

*U_i for this participant was estimated after summing in quadrature the participant's reported uncertainty value and the dark uncertainty (tau) associated with the key comparison reference value (KCRV) because estimation using the reported uncertainty value alone results in nonequivalence with the KCRV.

Comparison

Comparison close

CCQM-K158

Information & contact
Participants

Metrology area, Sub-field	Chemistry and Biology, Inorganics
Description	Elements and inorganic arsenic in rice flour
Time of measurements	2021 - 2022
Status	Approved for equivalence

Final Reports of the comparisons	Metrologia 2025 62 Tech. Suppl. 08001
Measurand	Mass fraction of Cu, Hg, K, Na, Sb or Pb in rice flour Mass fraction of total arsenic and inorganic arsenic in rice flour
Transfer device	Sample A: 10 g sample in an amber glass bottle (two bottles) Sample B: 10 g sample in an amber glass bottle (one bottle)

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 has two parts: Part A which covers the trace elements measurement analysis without arsenic. Part B which covers the measurement analysis of total arsenic and inorganic arsenic.
Pilot institute	NMIJ AIST National Metrology Institute of Japan Japan
Contact person	Kazumi Inagaki
Additional	Yong-Hyeon Yim, Korea Research Institute of Standards and Science

Pilot laboratory
NMIJ AIST	National Metrology Institute of Japan, Japan, APMP

GL	Government Laboratory, Hong Kong, China, APMP

HSA	Health Science Authority, Singapore, APMP

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

LATU	Laboratorio Tecnologico del Uruguay, Uruguay, SIM

LGC	Laboratory of the Government Chemist, United Kingdom, EURAMET

METAS

Federal Institute of Metrology, Switzerland, EURAMET

MIRS/IJS/F-2,O-2

MIRS/Jozef Stefan Institute/Low and Medium Energy Physics F2, Environmental Sciences O2, Slovenia, EURAMET

NIM	National Institute of Metrology, China, APMP

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

NIS	National Institute for Standards, Egypt, AFRIMETS

NMIA	National Measurement Institute, Australia, Australia, APMP

NMISA

National Metrology Institute of South Africa, South Africa, AFRIMETS

NRC	National Research Council, Canada, SIM

PTB	Physikalisch-Technische Bundesanstalt, Germany, EURAMET

CCQM-K158

MEASURAND Copper in polished rice flour

NOMINAL VALUE 0.5 mg/kg - 5 mg/kg

The key comparison reference value x_R and its associated standard uncertainty u_R were calculated using the Adaptive Weighted Average statistical model following the NIST Decision Tree, as explained on page 23 of the CCQM-K158 final report. The reported result for NIS was not included in the calculation of x_R.

x_R = 1.345 mg/kg u_R = 0.0030 mg/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 mg/kg:

D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence is calculated as explained on page 27 of the CCQM-K158 final report.

CCQM-K158

MEASURAND Mercury in polished rice flour

NOMINAL VALUE 0.1 mg/kg - 5 mg/kg

The key comparison reference value x_R and its associated standard uncertainty u_R were calculated using the Adaptive Weighted Average statistical model following the NIST Decision Tree, as explained on page 23 of the CCQM-K158 final report. The reported result for NIS was not included in the calculation of x_R.

x_R = 0.4788 mg/kg u_R = 0.0059 mg/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 mg/kg:

D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence is calculated as explained on page 27 of the CCQM-K158 final report.

CCQM-K158

MEASURAND Potassium in polished rice flour

NOMINAL VALUE 100 mg/kg - 1000 mg/kg

The key comparison reference value x_R and its associated standard uncertainty u_R were calculated using the Adaptive Weighted Average statistical model following the NIST Decision Tree, as explained on page 23 of the CCQM-K158 final report. The reported result for NIMT and NIS were not included in the calculation of x_R.

x_R = 616.6 mg/kg u_R = 3.3 mg/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 mg/kg:

D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence is calculated as explained on page 27 of the CCQM-K158 final report.

CCQM-K158

MEASURAND Sodium in polished rice flour

NOMINAL VALUE 2 mg/kg - 10 mg/kg

The key comparison reference value x_R and its associated standard uncertainty u_R were calculated using the Adaptive Weighted Average statistical model following the NIST Decision Tree, as explained on page 23 of the CCQM-K158 final report. The reported result for NIS and NIMT were not included in the calculation of x_R.

x_R = 5.399 mg/kg u_R = 0.064 mg/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 mg/kg:

D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence is calculated as explained on page 27 of the CCQM-K158 final report.

CCQM-K158

MEASURAND Lead in polished rice flour

NOMINAL VALUE 0.1 mg/kg - 1 mg/kg

The key comparison reference value x_R and its associated standard uncertainty u_R were calculated using the Adaptive Weighted Average statistical model following the NIST Decision Tree, as explained on page 23 of the CCQM-K158 final report.

x_R = 0.2166 mg/kg u_R = 0.0030 mg/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 mg/kg:

D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence is calculated as explained on page 27 of the CCQM-K158 final report.

CCQM-K158

MEASURAND Antimony in polished rice flour

NOMINAL VALUE 0.5 mg/kg - 5 mg/kg

The key comparison reference value x_R and its associated standard uncertainty u_R were calculated using the Adaptive Weighted Average statistical model following the NIST Decision Tree, as explained on page 23 of the CCQM-K158 final report. The reported result for NIMT was not included in the calculation of x_R.

x_R = 1.0130 mg/kg u_R = 0.0050 mg/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 mg/kg:

D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence is calculated as explained on page 27 of the CCQM-K158 final report.

CCQM-K158

MEASURAND Total arsenic in polished rice flour

NOMINAL VALUE > 0.02 mg/kg

The key comparison reference value x_R and its associated standard uncertainty u_R were calculated using the Adaptive Weighted Average statistical model following the NIST Decision Tree, as explained on pages 50 and 51 of the CCQM-K158 final report. The reported result for NIMT and METAS were not included in the calculation of x_R.

x_R = 0.1064 mg/kg u_R = 0.0006 mg/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 mg/kg:

D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence is calculated as explained on page 54 of the CCQM-K158 final report.

CCQM-K158

MEASURAND Inorganic arsenic in polished rice flour

NOMINAL VALUE > 0.02 mg/kg

The key comparison reference value x_R and its associated standard uncertainty u_R were calculated using the Adaptive Weighted Average statistical model following the NIST Decision Tree, as explained on pages 50 and 51 of the CCQM-K158 final report. The reported result for NRC and NIMT were not included in the calculation of x_R.

x_R = 0.0903 mg/kg u_R = 0.0006 mg/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 mg/kg:

D_i = (x_i - x_R) and its expanded uncertainty U_i at a 95 % level of confidence is calculated as explained on page 54 of the CCQM-K158 final report.

CCQM-K158

MEASURAND Copper in polished rice flour

NOMINAL VALUE 0.5 mg/kg - 5 mg/kg

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	mg/kg	mg/kg
	NIS*	0.939	0.088^#
	INTI	1.054	0.097^#
	NIMT	1.322	0.020
	HSA	1.352	0.015
	KRISS	1.3640	0.0062
	NMIJ	1.3740	0.018
	LATU	1.381	0.020
	NMISA	1.385	0.033
	MIRS/IJS/F-2,O-2	1.490	0.060

* Reported value is not included for the calculation of the key comparison reference value

^# Participant's value includes the uncertainty and the dark uncertainty, τ, summed in quadrature

CCQM-K158

MEASURAND Mercury in polished rice flour

NOMINAL VALUE 0.1 mg/kg - 5 mg/kg

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	mg/kg	mg/kg
	INTI	0.439	0.040
	MIRS/IJS/F-2,O-2	0.441	0.015
	NMISA	0.456	0.017^#
	GL	0.474	0.013
	NMIA	0.478	0.010
	NIM	0.4830	0.0064
	HSA	0.4838	0.0032
	LATU	0.4910	0.008
	NIMT	0.4970	0.0171^#
	KRISS	0.5016	0.0169^#
	NIS*	1.116	0.0409^#

* Reported value is not included for the calculation of the key comparison reference value

^# Participant's value includes the uncertainty and the dark uncertainty, τ, summed in quadrature

CCQM-K158

MEASURAND Potassium in polished rice flour

NOMINAL VALUE 100 mg/kg - 1000 mg/kg

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	mg/kg	mg/kg
	NIMT*	539	22^#
	NIS*	541	40
	NMISA	583	13^#
	MIRS/IJS/F-2,O-2	591	18
	PTB	609.3	3.9
	KRISS	613.6	1.9
	INM (CO)	617	12
	NMIJ	617.2	8.2
	LATU	622.0	7.8

* Reported value is not included for the calculation of the key comparison reference value

^# Participant's value includes the uncertainty and the dark uncertainty, τ, summed in quadrature

CCQM-K158

MEASURAND Sodium in polished rice flour

NOMINAL VALUE 2 mg/kg - 10 mg/kg

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	mg/kg	mg/kg
	NIS*	3.66	0.12^#
	MIRS/IJS/F-2,O-2	5.25	0.16
	KRISS	5.38	0.18
	NMIJ	5.431	0.090
	NMISA	5.45	0.14
	NIMT*	8.75	0.44^#

* Reported value is not included for the calculation of the key comparison reference value

^# Participant's value includes the uncertainty and the dark uncertainty, τ, summed in quadrature

CCQM-K158

MEASURAND Lead in polished rice flour

NOMINAL VALUE 0.1 mg/kg - 1 mg/kg

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	mg/kg	mg/kg
	NMISA	0.1570	0.0170^#
	INM (CO)	0.183	0.022^#
	METAS	0.198	0.018^#
	MIRS/IJS/F-2,O-2	0.204	0.006
	GL	0.2146	0.0045
	NMIJ	0.2146	0.0028
	NIMT	0.215	0.003
	HSA	0.2168	0.0043
	LATU	0.2181	0.0033
	KRISS	0.2186	0.0033
	PTB	0.2189	0.0022
	NIS	0.220	0.019
	NIM	0.221	0.002
	NMIA	0.2305	0.0173^#
	INTI	0.2415	0.019^#
	INMETRO	0.2448	0.0175^#

^# Participant's value includes the uncertainty and the dark uncertainty, τ, summed in quadrature

CCQM-K158

MEASURAND Antimony in polished rice flour

NOMINAL VALUE 0.5 mg/kg - 5 mg/kg

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	mg/kg	mg/kg
	NIMT*	0.939	0.021^#
	MIRS/IJS/F-2,O-2	0.946	0.033^#
	INTI	0.999	0.038
	GL	1.007	0.019
	NMIA	1.011	0.018
	KRISS	1.0115	0.0038
	HSA	1.017	0.018
	NMIJ	1.0217	0.0066

* Reported value is not included for the calculation of the key comparison reference value

^# Participant's value includes the uncertainty and the dark uncertainty, τ, summed in quadrature

CCQM-K158

MEASURAND Total arsenic in polished rice flour

NOMINAL VALUE > 0.02 mg/kg

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	mg/kg	mg/kg
	NIMT*	0.093	0.004^#
	METAS*	0.0970	0.0050^#
	MIRS/IJS/F-2,O-2	0.1037	0.0037
	LGC	0.1053	0.0012
	NIM	0.1060	0.0020
	NMIJ	0.1063	0.0020
	NMIA	0.1067	0.0029
	KRISS	0.107	0.007
	LATU	0.1070	0.0019
	HSA	0.1072	0.0019
	NRC	0.1075	0.0020
	GL	0.1080	0.0027
	INTI	0.1094	0.0057

* Reported value is not included for the calculation of the key comparison reference value

^# Participant's value includes the uncertainty and the dark uncertainty, τ, summed in quadrature

CCQM-K158

MEASURAND Inorganic arsenic in polished rice flour

NOMINAL VALUE > 0.02 mg/kg

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	mg/kg	mg/kg
	NRC*	0.0613	0.0103^#
	NIMT*	0.0810	0112^#
	GL	0.0889	0.0039
	HSA	0.0896	0.0029
	LGC	0.0901	0.0016
	NMIJ	0.09070	0.00096
	NIM	0.0939	0.0015

* Reported value is not included for the calculation of the key comparison reference value

^# Participant's value includes the uncertainty and the dark uncertainty, τ, summed in quadrature