Evaluation of microbiological purified water trend using two types of control chart

The microbial population in water is dynamic and may change not only from day to day but also at different times of the day. Researchers have observed that this microbiological distribution usually follows the Poisson or Negative Binomial model.1

Data trending regarding the microbiological density of water provides a comprehensive and informative means of assessing the quality, stability and safety of the microbial community in water. Statistical process control (SPC) provides a useful tool to address these items quantitatively, which could be integrated with quantitative risk assessment tools.

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