Chelation as a Method for Maintaining the Coliform Index in Water Samples

The presence of copper in drinking water samples at concentrations as low as 10 micrograms/l resulted in a rapid die-off of aeromonads. Coliform bacteria, heterotrophic plate count bacteria and faecal streptococci were also sensitive to copper but to a lesser degree than aeromonads. The effect was particularly noticeable in soft water (less than 3 meq/l Ca + Mg) and at pH-values below 8.0. The toxic effect of copper concentrations up to 500 micrograms/l could be neutralized for a period of up to 24 h by the addition to samples of 50 mg/l of disodium-ethylene-diamino-tetraacetate (Na2EDTA) and keeping the samples on melting ice.

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Comparison of four-hour and twenty-four-hour refrigerated storage of nonpotable water for fecal coliform analysis

Standridge¹,

Lesar²

1977

Appl Environ Microbiol

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The problem of extending the storage time of water samples for fecal coliform analysis was addressed. Included in this report is a literature review of the storage problem. Twenty-eight samples were analyzed in replicate to determine the effect of 24-h storage of water samples at 40C. A new statistical approach to data analysis, coupled with the concept of practical acceptability, is presented. According to our results, many samples can successfully be stored at 4°C for 24 h.

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Chelation as a Method for Maintaining the Coliform Index in Water Samples

Cited by 4 publications

References 6 publications

Destruction of Molar Teeth in Rats Fed Amino Acid Diets

Destruction of Molar Teeth in Rats Fed Amino Acid Diets

Complexing of copper in drinking water samples to enhance recovery of Aeromonas and other bacteria

Comparison of four-hour and twenty-four-hour refrigerated storage of nonpotable water for fecal coliform analysis

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