Analytical quality assurance

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The term Analytical Quality Assurance (AQA) summarizes all measures that enable statements about the quality and susceptibility of an analytical investigation to be made.

Because analytical chemistry has become an important service sector, analytical studies are carried out regularly in all areas.

Procedure

The AQA's areas of responsibility are diverse and range from sampling and sample transport to the actual measurement evaluation. In analytical quality assurance, a sample is taken according to the operating method and also examined by an approved laboratory according to the DIN method. The deviations between the two analyzes should be as small as possible. Most of the deviations result from wear and tear , incorrect calibration or human errors.

In some analytical areas, regular AQA is required.

Areas of application

The AQA plays a major role in those areas in which precise measurements are required. For example in sewage or water works , but also in the chemical analysis of food.

Analytical quality assurance procedures are also used in computer science to test the correctness, efficiency, robustness and usability of programs. The usual procedures are divided into the white box tests (e.g. boundary-interior path test), which are carried out with a view to the source code and with the help of control flow graphs , and the black-box test procedures , which are only in and View output. Also, regression tests are applied. However, the tests can only determine the presence of defects, not their absence. A complete formal (ie mathematical) verification of programs is costly and is therefore used almost exclusively for safety systems (traffic control systems, monitoring programs for power plants, etc.).

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