This document is withdrawn and replaced by:
Water and sludge - Guideline for internal quality control by the use of control charts with chemical analyses
This code of practice gives guidelines for the quality control and chemical analysis within the laboratories by using control charts according to Shewart. The code applies to the implementation of chemical determinations in any kind of water or sludge and can be used for the own assessment of the quality system of the laboratory as described in NEN 2653.
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