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EC number: 248-256-4
CAS number: 27138-01-8
The 72h EC50 for average specific growth rate and yield could not be calculated due to the lack of fractional inhibition, and it is therefore estimated to be > 100 mg/L. The NOEC was estimated to be 100 mg/L.
This study was designed to determine
the effects of the reaction mass a, a, a', a'-tetramethyl-m-xylene-a,
a'-diol and a, a, a', a'-tetramethyl-p-xylene-a,
a'-diol (m/p DIOL) on the growth of Pseudokirchneriella
subcapitata, a unicellular freshwater green alga, over a 72 h
period. The study was performed to meet the requirements of OECD (2006)
Based on the results from the range
finding test, the definitive test was conducted with nominal
concentrations of 6.25, 12.5, 25, 50 and 100 mg/L m/p DIOL, together
with an untreated control. The corresponding mean measured (0 and 72 h)
concentrations of m/p DIOL were 5.87, 12.21, 23.77, 47.04 and 96.58
mg/L, respectively. Chemical analysis of test samples taken at 0 and 72
h indicated that concentrations of m/p DIOL were maintained over the 72
h test period, with concentrations in the range 95% to 101% of the
initial measured values.
The 72h EC50 for average specific
growth rate and yield could not be calculated due to the lack of
fractional inhibition, and it is therefore estimated to be > 100
mg/L. The NOEC was estimated to be 100 mg/L.
OECD Guideline 201 validity criteria
were met and therefore the test was considered to be acceptable
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