Abstract
Biodegradable dissolved organic carbon (BDOC) in water is evaluated by the DOC reduction in the sample inoculated with a natural biomass, fixed on sand particles, within a few days incubation period. Recorded BDOC values are independent of the origin of the inoculum. This bioassay is accurate, precise, gives reproducible results and is sufficiently sensitive even for distributed water. A good relationship between BDOC values and the regrowth potential of presterilised samples of water reinoculated with Ps. fluorescens or mixed natural populations of bacteria is observed.

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