1. Uncertainty evaluation in the measurement of organics compounds
Description of the methodology used for the analysis of chlorinated pesticides in hexane in the SIM intercomparison study performed by Organics Materials Division of CENAM,as an example for uncertainty measurement evaluation.
Gas chromatography with electron capture detector (GC-ECD) was used for analysis of the samples and construction of the calibration curve.
Alejandro Pérez Castorena

2. Uncertainty evaluation in the measurement of organics compounds
Preparation of the working standard
solution (containing all analytes)
PREPARATION OF STANDARD FOR THE CC
CRM´s
CRM(SRM 2261)
Hexane
Cd1(HBC)
Cd2(HBC) 1
HCB
Lindano (g-HCH)
Heptacloro
E. de hepatcloro
2,4'-DDE
Cis-clordano
...
Mirex
... + 1 6
Istd
PCB 103 2
PCB(103) +
PREPARATION OF THE MULTIELEMENTAL INTERNAL STANDARD SOLUTION (Ga, Rh and Bi) and CALIBRATION CURVE
Alejandro Pérez Castorena

3. Uncertainty evaluation in the measurement of organics compounds
Recovery using
CRM
reproducibility Cs
Linear regression model used for interpolationAccording with the ISO and
(a) R is not significantly different from 1. No correction is applied
(b) R is significantly from 1 and a correction for R is applied
( c ) R is sinficantly different form 1 but, for operational reasons, no correction for R is applied
Alejandro Pérez Castorena

4. Uncertainty evaluation in the measurement of organics compounds
Alejandro Pérez Castorena