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EC number: 807-040-5
CAS number: 4538-42-5
NOEC and LOEC were determined according to STUDENT-t test for
In order to test acute toxicity to
algae of PDI, exponentially growing algal cells (Desmodesmus
subspicatus) were exposed for a period of 72 hours to a limit test
concentration of nominally 100 mg/L of PDI dissolved in dilution water.
During the test a temperature range of 21 - 24 °C was maintained in the
test vessels. The pH was measured at the beginning of the test and after
72 hours of exposure. PDI has not a definite or unique structure and
consists of serveral components. Water Accommodated Fraction (WAF) was
used to test effects at limit effective loading. The content of PDI
during the exposure period was verified by DOC determination. The cell
densities were measured at 24 hour intervals. Inhibition of the algal
population was measured as reduction in growth rate (index r), relative
to control cultures grown under identical conditions. Growth rates were
also used to calculate a No Observed Effective Loadings and a Lowest
Observed Effective Loadings according to STUDENT-t test for Homogeneous
Variances. The following values were determined: ErL 50 (0-72 h) : >
100; ErL 10 (0-72 h) : > 100; NOEL [r] (tα 0.05) : ≥ 100; LOEL [r] (tα
0.05) : > 100. No toxic effects against algae were observed at a limit
test concentration of nominally 100 mg/L.
This toxicity study is classified
as acceptable and satisfies the guideline requirements for the algae
No toxic effects against algae were observed at the limit loading of 100 mg/L after 72 hours under exposure conditions (Spoo-Klöppel, 2016).
"Should read: EL-50 > 100, NOEL >=
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