CCQM-K173 and CCQM-K173.1

MEASURAND   Amount content of bases expressed as sodium carbonate (Na₂CO₃)

NOMINAL VALUE 10 mol/kg

Degrees of equivalence represented by D_i = (x_I - x_R) and its expanded uncertainty U_i at a 95 % level of confidence (k = 2), both expressed in mol/kg.

CCQM-K173 and CCQM-K173.1

MEASURAND   Amount content of bases expressed as sodium carbonate (Na₂CO₃)

NOMINAL VALUE 10 mol/kg

Degrees of equivalence represented by D_i = (x_I - x_R) and its expanded uncertainty U_i at a 95 % level of confidence (k = 2), both expressed in mol/kg.

CCQM-K173 and CCQM-K173.1

MEASURAND   Amount content of bases expressed as sodium carbonate (Na₂CO₃)

NOMINAL VALUE 10 mol/kg

The key comparison reference value x_R and its associated standard uncertainty u_R are computed from the median of the results of the participants, excluding CMI, INMETRO and SE "Ukrmetrteststandard" (See further detailed information in section 8.1 of the CCQM-K173 Final report.

         x_R = 9.4320 mol/kg     u_R = 0.00114 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 = 2 (u_i ² + u_R²)^1/2

Linking CCQM-K173.1 to CCQM-K173

SMU provides the link between the key CCQM-K173 and CCQM-K173.1, having participated in both comparisons. The linking process is described in Section 8 of the CCQM-K173.1 Final report.

CCQM-K173 and CCQM-K173.1

MEASURAND   Amount content of bases expressed as sodium carbonate (Na₂CO₃)

NOMINAL VALUE 10 mol/kg

x_i   measurement value reported by laboratory i, Lab_i

u_i   standard uncertainty of x_i

CCQM-K173

CCQM-K173.1