A Monitor's Guide to Water Quality


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Most North American rivers, lakes and streams fall within the range of pH 6.5-8.2. National guidelines recommend pH of 6.5-9.0 for the protection of aquatic life in freshwaters.

Related to pH: alkalinity, oxidation-reduction potential (ORP)

pH is influenced by: background water chemistry - especially carbonate, bicarbonate and naturally-occurring acids

pH influences: dissolved concentrations of many metals and metalloids in water