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EC number: 258-904-8
CAS number: 53988-10-6
The growth rate of algae was determined as ErC50 (0-72 h) = 62.24 mg/L. Furthermore, a NOEC of 25.0 mg/L and a LOEC of 50.0 mg/L was calculated.
In order to test acute toxicity to algae of 1,3-dihydro-4(or
5)-methyl-2H-benzimidazole-2-thione, Desmodesmus subspicatus was exposed
to the test solution of five nominal concentrations of the test
substance ( 6.3, 12.5, 25, 50 and 100 mg/L) and blank control solution
for a period of 72 hours under static conditions. The cell densities
were measured at 24 hours intervals. Inhibition of the algal population
was measured as reduction in growth rate (index r), relative to control
cultures grown under identical conditions. The measured concentrations
confirm that deviation from the nominal concentrations was less than 30
% ( measured concentrations were in the range of 97.0 - 101.8 % of
nominal concentrations). The growth rate of algae was determined as
ErC50 (0-72 h) = 62.24 mg/L. Furthermore, a NOEC of 25.0 mg/L and a LOEC
of 50.0 mg/L was calculated. This toxicity study is classified as
acceptable and satisfies the guideline requirements for the acute algae
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