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According to this research, which was part of a larger studyon the effects of metaphosphate on lead and copper solubilityin plumbing systems, metaphosphate reverts morerapidly in household plumbing systems than in distribution systems.Therefore, if utility managers add metaphosphate inhibitorsto drinking water, they should collect samples from both thedistribution system and from consumers' taps to get a true picturein their specific system. Some corrosion, scale, and red waterinhibitors contain metaphosphate, which slowly reverts toorthophosphate, in turn possibly affecting an inhibitor's effectiveness.This reversion occurs more rapidly in hard water than in softwater and is much more rapid in aged pipe than in a glass beaker.This research will affect corrosion control efforts, which are inturn driven by public health and regulatory issues. Many complianceprograms involve sampling from a distribution system andconsumers' taps. The apparent degree of metaphosphate reversionmay be very different at a consumer's tap than in the distributionsystem. Includes 26 references, table, figures.

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Edition: Vol. 95 - No. 4 Published: 04/01/2003 Number of Pages: 7 File Size: 1 file , 240 KB