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EC number: 202-795-1
CAS number: 99-86-5
Table 1. Range finding study yield results
Nominal concentration (mg/L)
Mean Biomass 72 hours (cells/ml×104)
Percentage of solvent control (%)
72 hour microscopic observations:
Control, solvent control and all test concentrations: Normal
Table 2. Range finding study analytical results
0 hour measured concentration (mg/L)
0 hour measured conc. (% of nominal)
72 hour measured concentration (mg/L)
72 hour measured conc. (% of nominal)
Mean measured concentration (Geometric mean) (mg/L)
Mean measured concentration (Geometric mean) (% of nominal)
LOQ varied from 0.01 to 1.00 mg/L due to
different dilution factors (increasing with concentration).
If values are <LOQ then zero was used in
calculation of the mean.
Table 3. Definitive test yield results
Mean Yield 72 hours (cells/mLx×104)
Table 4. Definite test analytical results.
0 hour measured conc. (mg/L)
72 hour measured conc. (mg/L)
Mean measured conc. (arithmetic) (mg/L)
Mean measured conc. (% of nominal)
The effects of Alpha-terpinene on the growth of alga Pseudokirchneriella
subcapitata was determined over 72 hours, according to OECD
guideline 201. A NOEC of 3.7 mg/l and a LOEC of >3.7 mg/l (based
on geometric mean measured concentrations) have been reported for this
Key study: Test method according to OECD 201, GLP study. The
effects of Alpha-terpinene on the growth of alga Pseudokirchneriella
subcapitata was determined over 72 hours. A NOEC of 3.7 mg/l
and a LOEC of >3.7 mg/l (based on geometric mean measured
concentrations) have been reported for this study.
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