PH
Containment systems for the prevention of pollution, Secondary, tertiary and other measures for industrial and commercial premises (CIRIA C736), published by CIRIA in 2014 defines pH as a: ‘Measure of the acidity or alkalinity of a solution, numerically equal to 7 for neutral solutions, increasing with increasing alkalinity or decreasing with increasing acidity.'
Water Treatment for Closed Heating and Cooling Systems (BG 50/2021), second edition, by Dr Pamela Simpson, published by BSRIA in 2021, defines pH as: ‘A measure of the whether the water is alkaline or acidic based on the logarithm of the hydrogen ion concentration. Water at pH 7 is neutral. Water at greater than pH 7 is alkaline and water at less than pH7 is acidic. For most metals, corrosion rates increase as the pH falls below 7.’
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