IJCA - Volume 3 - Flipbook - Page 16
14
The International Journal of Conformity Assessment
of 0.25. The test of the residue concentrations in the
test sample is passed if the measured residues are
equal to the reference within the total uncertainty.
Results smaller than the report limit are set to 0.01
mg/kg. All analytes in the reference must also be
found in the test sample.
The conformity test is considered passed if all
inspection criteria of the reference sample are also
present in the test sample according to the checklist.
Therefore:
• The documented information is sufficient for the
unambiguous identification and traceability of the
sample.
• The analytical data of both samples, qualitatively
and quantitatively, lead to the same decision about
the basic population.
The result of the evaluation is reported to the
management and serves as a basis for further internal
training and evaluation of samplers and/or methods.
Results and Discussion
The following conformity assessments for sampling
methods and authorization of a sampler shall be
discussed (Table 1).
Case 1: Unit items were taken by the same technician
from 12 sampling points, evenly distributed along a
“W” covering the entire 昀椀eld consisting of 35 rows.
The difference was the mirrored position of the apex
points of the “W.” The “W” of the reference sample
started at the track perpendicular to the rows. The
“W” for the test sample started at the end of the row
Table 1. Case studies for conformity tests
CASE
Location
1. SAMPLING
METHOD
Greenhouse with
separate rows
Analyte
Chlormequat
Application
Spraying
Local
Reversing ranges
conditions/
of the spraying
features
machine
Population
Tomatoes
Sampling item Leaves
Test aim
Alignment of the
sampling “W” in
the 昀椀eld
2. SAMPLING
METHOD
Greenhouse with
separate rows
Pesticides
Spraying
Reversing ranges
of the spraying
machine
Tomatoes
Leaves
Sampling “W” vs.
“ladder”
3. SAMPLING
METHOD
Greenhouse with
separate rows
Pesticides
Spraying
Reversing ranges
of the spraying
machine
Tomatoes
Fruits
Sampling “W” vs.
“ladder”
4. SAMPLE
TAKER
Cooling
storage
Pesticides
5. SAMPLE
TAKER
180 collis in 6
stacks
Historic sewage
昀椀elds
Heavy metals
Sedimentation
Enrichment
zones
Grapes
500 g box
Authorisation
of a sampler
Soil
30 cm drill core
Authorisation of
a sampler
