86
6 Reference Materials in Chemical Measurements
Table 6.1 Important information that should be given in the reference material certificate
Information
Description
Comments
Name of the document
Certificate of reference
material;
Certificate of analysis
Depend on the producer
ID of CRM
CRM name, ID number
Crucial
Measurand
Name of chemical compound Definition of measurand if it is
method-dependent
Kind of object
Name of the material used
Type of the chemical matrix
Short description of material
Detailed information on the
kind of material, including
storage condition, safety issue
Note whether storage
conditions refers to unopened
container or after opening the
container (due to e.g.,
moisture uptake or protective
inert gas losses)
Certified value with
uncertainty
Value accompanied by
uncertainty at given
probability (k factor)
Crucial
Minimum sample intake
Minimum amount of material
that is representative for the
whole CRM
Depends on homogeneity of
material
Moisture determination
The conditions
(temperature/time) used for
determination of moisture
content
Depends on how the certified
value is given
Expire date of the certificate
Date related to the issue of
certificate
Given by producer
Shelf life of the CRM
Information of the stability of
CRM
Could be given as:
– Final date (e.g., March
2019);
– Period (e.g., 6 months after
delivery or 2 months after
opening);
– Undefined, to the use of
material
Signature of authorized person Name, position and signature
of authorized person
Given by producer