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EC number: 202-795-1
CAS number: 99-86-5
Table 1: Mortalities
Control (0 µg/L)
A (1060 µg/L)
B (2120 µg/L)
C (3190 µg/L)
D (4250 µg/L)
E (5310 µg/L)
Table 2: Effects
In an acute aquatic toxicity study performed similarly to OECD guideline
203, groups (10/dose) of fathead minnows (Pimephales promelas) were
exposed to alpha terpinene at concentrations of <195, 1050, 2090, 2720,
3640 and 4820 μg/L (measured) for 96 hours under flow-through
conditions. Mortality, behaviour and morphological aberrations were
observed at 24, 48, 72 and 96 hours. All validity criteria were
fulfilled. Mortalities (96 hour) at <195, 1050, 2090, 2720, 3640 and
4820 μg/L (measured) were 0, 0, 0, 10, 90 and 100%, respectively.
Treatment-related effects (96 hour) at <195, 1050, 2090, 2720, 3640 and
4820 μg/L (measured) were observed in 0/10, 0/10, 10/10, 10/10, 10/10
and 10/10 fish respectively. The 96 hour LC50, EC50 and NOEC of alpha
terpinene to fathead minnow (Pimephales promelas) were calculated to be
3150 (2920 -3400) μg/L, 1480 μg/L and 1050 μg/L, respectively.
Key study: Test method similar to OECD 203. The 96h-LC50 of alpha
terpinene to fathead minnow (Pimephales promelas) was found to be 3150
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