Registration Dossier
Registration Dossier
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EC number: 203-996-7 | CAS number: 112-67-4
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
Parent compound palmitoyl chloride: No data.
Hydrolysis product palmitic acid: No inhibitory effects of the substance on the degradation activity on activated sludge were observed at concentrations well above the water solubility limit. An inhibition of the degradation activity of activated sludge is not anticipated when the substance is introduced in appropriate low concentrations.
Hydrolysis product HCl: No data.
Key value for chemical safety assessment
Additional information
Parent compound palmitoyl chloride (CAS 112 -67 -4):
No data are available for palmitoyl chloride (CAS 112 -67 -4). The substance rapidly decomposes in water and forms HCl (CAS 7647 -01 -0) and palmitic acid (CAS 57 -10 -3). Therefore, the toxicity to microorganisms is assessed on the basis of data on palmitic acid.
Hydrolysis product palmitic acid:
No inhibitory effect on the degradation activity of domestic activated sludge was observed in a ready biodegradability test was observed. Palmitic acid was readily biodegradable. A NOEC of >= 34.8 mg/L were dervied from the study (BASF AG, 1994; report no. R9400080).
In addition, the effects on the O2 consumption of P. putida were investigated following the DIN guideline 38412 part 27. The 30 -min EC0 was 3000 mg/L (BASF AG, 1994, report no.: R9400113).
In both studies no effects were observed up to (and above) the limit of water solubility.
Based on the result above, the inhibition of the degradation activity of activated sludge is not anticipated when the substance is introduced in appropriately low concentrations. It should be pointed out that the effect values are greater than the water solubility limit.
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