Analytical Quality Assurance (Aqa); Quality Control At The Manufacturer - wtw PhotoLab S12-A Operating Instructions Manual

5 Analytical Quality Assurance (AQA)

The objective of analysis must always be to determine the true content of
the analyte in question as accurately and precisely as possible.
Analytical Quality Assurance represents a suitable and indispensible
method by which the quality of the user's own work can be assessed,
errors in the measurement system diagnosed, and the comparability with
the results obtained using the respec tive refe rence methods demonstrated.
Details regarding the necessity of AQA can be found in the in Memoran-
dum A 704 of the German Association for the Water Sector, Wastewater,
and Waste Materials (Deutsche Vereinigung für Wasserwirtschaft, Abwas-
ser und Abfall e.V., DWA) and in the corresponding self-con trol/self-moni-
toring regulations of the Ger man federal states (available in english).
Causes for errors can include:
•
the working materials used
•
the handling
•
the sample under investigation.
These errors have effects on both the accuracy and precision of the
results obtained.

5.1 Quality Control at the Manufacturer

Photometers and photometric test kits possess specifications that are
adhered to and above all else also documented by the manufacturer.
The certificate for the photometer enclosed with each device docu-
ments the quali ty of the measuring device.
Release 01/2009
photoLab ® Series
15