Unreliability of cold-stored samples for assessment of chemical precipitates of phosphate in activated sludge

D. W. de Haas, I. A. Dubery

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

The effect on orthophosphate and polyphosphate levels was investigated for refrigerated or frozen activated sludge samples. A short fractionation procedure was used involving removal of the supernatant, washing with physiological saline, and extraction at 0°C with perchloric acid. It was found that storage at 4°C or -20°C (followed by thawing to 15°C or room temperature) resulted in polyphosphate hydrolysis to orthosphosphate. The latter may have been erroneously interpreted in the past as 'chemical precipitate'.

Original languageEnglish
Pages (from-to)257-260
Number of pages4
JournalWater S.A.
Volume15
Issue number4
Publication statusPublished - Oct 1989
Externally publishedYes

ASJC Scopus subject areas

  • Applied Microbiology and Biotechnology
  • Water Science and Technology
  • Waste Management and Disposal
  • Management, Monitoring, Policy and Law

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