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EC number: 203-398-6
CAS number: 106-44-5
A percentage of the nominal concentration (5.3 ~ 100.Omg / L), the exposure at the start is 88.7 to 106.0%, exposure for 72 hours was 92.5 to 103.7%. Since the measured concentration at the start of exposure was within ± 20% of nominal concentration the nominal concentration was used in the calculation of the test results.
Toxicity to alga Pseudokirchnerella subcapitata (reported as Selenastrum capricornutum) was conducted according to OECD-Guideline 201. After 72 hours of exposure a NOEC (growth rate) of 17.1 mg/L and a ErC50 (growth rate) of 48.4 mg/L were obtained. Additionally, a NOEC (biomass, i.e. "area under growth curve") of 23.0 mg/L and a EbC50 (biomass, i.e. "area under growth curve") of 48.4 mg/L were determined.
The toxicity of p-cresol to the algae Pseudokirchnella subkapitata (former name Selenastrum capricornutum) was determined according to OECD TG 201 (1984) yielding an 72 h-EbC50 of 23 mg/l and an NOEC of 9.5 mg/l (both related to biomass) were determined.
The effects of p-cresol on the the green alga Scenedemus subspicatus was also tested by a cell multiplication inhibition test (Kuehn and Pattard 1990). The experiment wass carried out according to a national standard procedure, DIN 38412, part 9. Based on nominal cincentrations a 48h-EC50 of 21 mg/l and an EC10 of 4.6 mg/l (both related to growth rate) were determined.
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