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CENTRO DE METROLOGIA QUIMICA

CENTRO DE METROLOGIA QUIMICA. CALCULATION OF UNCERTAINTIES FOR THE RESULTS REPORTED IN SIM.QM-P2. As, Cu, Fe, Mn, Ni, Pb, (Zn) Perkin-Elmer AAnalyst700 Atomic Absorption Spectrophotometer equipped with a longitudinal graphite furnace. ANALYTICAL MEASUREMENT. Cd

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CENTRO DE METROLOGIA QUIMICA

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  1. CENTRO DE METROLOGIA QUIMICA

  2. CALCULATION OFUNCERTAINTIESFOR THE RESULTSREPORTED IN SIM.QM-P2

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

  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. THE UNCERTAINTY ESTIMATION PROCESS Specify associated model Identify Uncertainty Sources QuantifyUncertainty Sources Convert to standarduncertainty Calculate combinedstandarduncertainty Reporting Uncertainty

  7. ASSOCIATED MODEL: BRACKETING AH AS AL CL CS CH Sample concentration is calculated through the equation

  8. IDENTYFING UNCERTAINTY SOURCES AL, AH, As d repeatability repeatability calibration temperature Csample F(dil) U-SMR repeatability calibration CL, CH temperature

  9. QUANTIFYING UNCERTAINTY SOURCES AL, AH, As d repeatability repeatability calibration temperature Csample F(dil) U-SMR repeatability calibration CL, CH temperature

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

  11. QUANTIFYINGUNCERTAINTY SOURCES AL, AH, As d repeatability repeatability calibration temperature Csample F(dil) U-SMR repeatability calibration CL, CH temperature

  12. Csample F(dil) U-SMR repeatability calibration temperature CL, CH Equation for concentration assessment Equation for the uncertainty calculation

  13. Csample F(dil) U-SMR repeatability calibration temperature CL, CH

  14. PREPARATION OF STANDARDS Values and uncertainties CL = 9.827 mg/L uC = 0.055 mg/L

  15. QUANTIFYINGUNCERTAINTY SOURCES AL, AH, As d repeatability repeatability calibration temperature Csample F(dil) U-SMR repeatability calibration CL, CH temperature

  16. CALCULATING THE CONCENTRATION

  17. CALCULATING THE COMBINEDSTANDARDUNCERTAINTY

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

  19. CALCULATION OF COMBINEDSTANDARDUNCERTAINTY

  20. UNCERTAINTY CONTRIBUTIONS

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

  22. RESULTS OF Intec IN SIM.QM-P2 SUMMARY OF RESULTS OBTAINED ON SAMPLE SIM-P2 Element Average concentration Expanded Uncertainty REU (%) ( g/L) ( g/L) m m Ni 62,86 2,52 4,0 Fe 93,19 1,84 2,0 Cu 17,06 0,44 2,6 As 50,94 1,02 2,0 Pb 21,86 0,66 3,0 Mn 39,44 1,58 4,0 Cd 144 4 2,8

  23. RESULTS OF SIM.QM-P2

  24. RESULTS OF SIM.QM-P2

  25. CENTRO DE METROLOGIA QUIMICA

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