1. Alejandro Pérez Castorena1 Uncertainty TRACE METALS MEASUREMENT, USING HR ICP-MS

2. Alejandro Pérez Castorena2 PREPARATION OF THE WORKING STANDARD SOLUTION (Multielemental) PREPARATION OF THE CC STANDARD (S1) PREPARATION OF THE SINGLE ELEMENT, INTERNAL STANDARDS PREPARATION OF THE MULTIELEMENTAL INTERNAL STANDARD SOLUTION (Ga, Rh and Bi) and CALIBRATION CURVE Working standard solution SINGLE ELEMENT HNO 3 3 % CRM´s 1 2 3 5... + 5 3 2 1 C d2 (Cu) 1 C d1 (Cu) 5... C M (Cu) C M (Pb) C M (Ni) C M (Zn)... C M (Ba) C M (Ga) C M (Rh) C M! (Bi)

3. Alejandro Pérez Castorena3 Standard preparation Sensitivity Internal standard preparation, C Reproducibility of the measurement Density of the sample Atomic weight CmCm Step VIII Step VII Intensity of the Blank IUPAC Balance linearity repeatability Balance linearity repeatability resolution measurement

4. Alejandro Pérez Castorena4

5. 5 PREPARATION OF THE WORKING STANDARD (SINGLE ELEMENT SOLUTION) C d2 (Cu) linearity repeatability linearity repeatability linearity repeatability certificate I IIIIV II

6. Alejandro Pérez Castorena6 PREPARATION OF THE WORKING STANDARD SOLUTION (Multielemental) C M (Cu) C M (Pb) C M (Ni) C M (Zn)... C M (Ba) linearity repeatability linearity repeatability V VI IV

7. Alejandro Pérez Castorena7 PREPARATION OF THE CC STANDARD (S1) C S1 (Cu) C S! (Pb) C S! (Ni) C S! (Zn)... C S! (Ba) linearity repeatability linearity repeatability VII VIII VI

8. Alejandro Pérez Castorena8 PREPARATION OF THE SINGLE ELEMENT, INTERNAL STANDARDS C d2 (IE) linearity repeatability linearity repeatability linearity repeatability certificate IIVIIIII

9. Alejandro Pérez Castorena9 PREPARATION OF THE MULTIELEMENTAL INTERNAL STANDARD SOLUTION (Ga, Rh and Bi) and CC linearity repeatability linearity repeatability V VI C M (Ga) C M (Rh) C M! (Bi) VII VIII C dM (Ga) C dM (Rh) C dM! (Bi)