1. CENTRO DE METROLOGIA QUIMICA

2. CALCULATION OF UNCERTAINTIES FOR THE RESULTS REPORTED IN SIM.QM-P2

3. ANALYTICAL MEASUREMENT As, Cu, Fe, Mn, Ni, Pb, (Zn) Perkin-Elmer AAnalyst700 Atomic Absorption Spectrophotometer equipped with a longitudinal graphite furnace

4. Cd Flame Atomic Absorption Spectrophotometry Perkin-Elmer AAnalyst100 and using high sensitivity nebulizer ANALYTICAL MEASUREMENT

5. NIST-SRMs were used for the preparation of calibration standards. The quantification method used was bracketing Four independent aliquots of the sample were analyzed, in all cases. NIST-SMR 1643d was used as control (except for Cd) ANALYTICAL MEASUREMENT

6. Identify Uncertainty Sources THE UNCERTAINTY ESTIMATION PROCESS Calculate combined standard uncertainty Specify associated model Quantify Uncertainty Sources Reporting Uncertainty Convert to standard uncertainty

7. ASSOCIATED MODEL: BRACKETING CLCL CHCH ALAL AHAH CSCS ASAS Sample concentration is calculated through the equation

8. IDENTYFING UNCERTAINTY SOURCES repeatability calibration temperature C sample d A L, A H, A s repeatability C L, C H calibration temperature F(dil) U-SMR

9. QUANTIFYING UNCERTAINTY SOURCES repeatability calibration temperature C sample d A L, A H, A s repeatability C L, C H calibration temperature F(dil) U-SMR

10. Repeatability of A (S,L,H) The uncertainty due to random variation of the EAA signal measurement of samples and bracketing standards was calculated as: QUANTIFYING UNCERTAINTY SOURCES Fe Determination

11. repeatability calibration temperature C sample d A L, A H, A s repeatability C L, C H calibration temperature F(dil) U-SMR QUANTIFYING UNCERTAINTY SOURCES

12. C sample repeatability C L, C H calibration temperature F(dil) Equation for concentration assessment Equation for the uncertainty calculation U-SMR

13. C sample repeatability C L, C H calibration temperature F(dil) U-SMR

14. C L = 9.827  g/Lu C = 0.055  g/L PREPARATION OF STANDARDS Values and uncertainties

15. repeatability calibration temperature C sample d A L, A H, A s repeatability C L, C H calibration temperature F(dil) QUANTIFYING UNCERTAINTY SOURCES U-SMR

16. CALCULATING THE CONCENTRATION

17. CALCULATING THE COMBINED STANDARD UNCERTAINTY

18. KRAGTEN (*) Finally (*) J. Kragten, Analyst, 119, 2161-2166 (1994)

19. CALCULATION OF COMBINED STANDARD UNCERTAINTY

20. UNCERTAINTY CONTRIBUTIONS

21. Finally, the concentration and uncertainty values for Fe in the sample SIM.QM-P2 are: Concentration C S = 93.19  g/L Combined uncertainty u com = 0.92  g/L Expanded uncertainty U = 1.84  g/L U=u*k, (k=2) (1.97%)

22. RESULTS OF Intec IN SIM.QM-P2 SUMMARY OF RESULTS OBTAINED ON SAMPLE SIM-P2 ElementAverage concentrationExpanded UncertaintyREU (  g/L)(  (%) Ni62,862,524,0 Fe93,191,842,0 Cu17,060,442,6 As50,941,022,0 Pb21,860,663,0 Mn39,441,584,0 Cd14442,8

23. RESULTS OF SIM.QM-P2

25. CENTRO DE METROLOGIA QUIMICA