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EC number: 215-657-0 | CAS number: 1338-02-9
Biodegradation in water and sediment: simulation tests
Administrative data
Link to relevant study record(s)
Description of key information
Enrichment cultures, obtained from an active tailings settling pond, using commercially available Naphthenic acid (NA) as the sole carbon source, resulted in the isolation of a co-culture containing Pseudomonas putida and Pseudomonas fluorescens. Quantitative GC–MS analysis showed that the co-culture removed >95% of the commercial NA, and partially degraded the process NAs from OSPW with a resulting NA profile similar to that from ‘aged wetlands’.
Key value for chemical safety assessment
Additional information
The study does not report values for half-life in water and sediment but overall it is concluded that Naphthenic acid is biodegradable.
Sediments from eleven wetlands, both natural and process-affected, and one tailings settling pond were studied.
The extent of degradation of a 14C-labelled monocyclic NA surrogate (14C-cyclohexane carboxylic acid) was relatively uniform in all sediments (approximately 30%) after 14 days. In contrast, degradation of a bicyclic NA surrogate (14C-decahydronaphthoic acid) was significantly lower in non process-affected sediments. Enrichment cultures, obtained from an active tailings settling pond, using commercially available NAs as the sole carbon source, resulted in the isolation of a co-culture containing Pseudomonas putida and Pseudomonas fluorescens. Quantitative analysis showed that the co-culture removed >95% of the commercial NAs, and partially degraded the process NAs from OSPW with a resulting NA profile similar to that from ‘aged wetlands’.
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