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What is the maximum recommended holding time for a sample that is to be analyzed for pH?

24 hours

None, it must be analyzed immediately

For pH analysis, it is crucial that samples are tested as quickly as possible after collection to ensure accuracy. The reason behind this urgency is that pH can change due to various factors such as temperature fluctuations, the introduction of contaminants, or changes in dissolved gases from atmospheric exposure. As such, holding time can significantly influence the results.

While some other water quality parameters may afford a longer holding time before analysis, pH requires immediate attention to obtain valid and representative results. This is why the recommendation is to analyze the sample immediately upon collection, supporting the importance of prompt testing to preserve the sample's integrity.

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