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EC number: 947-115-0
CAS number: -
There is a high probability that the product is not acutely toxic to aquatic algae.
The toxicity of disodium
(sulphonatothio)acetate; dried to the unicellular freshwater green alga
Pseudokirchneriella subcapitata was determined according to the
principles of OECD 201 (2011). The aim of the study (BASF SE, 2015) was
to assess the effects on the growth rate over a period of 72 hours. In
this aquatic test, the original liquid product was tested. This product
contains 39.3 % dry content, which is identical with the test item
"Disodium (sulphonatothio)acetate; dried". This dry content contains 75%
of the chemical disodium (sulphonatothio) acetate.
The results of the toxicity test are
reported based on the dry content. Additionally, the results are given
for the liquid product.
A water solubility of 557 ± 24 g/L at
20.0 °C ± 0.5 °C was determined with the dried product and refers to the
dry content. The stock solution, identical with the test solution, of
509 mg/L of the liquid product was freshly prepared with dilution water
before the start of exposure (at 0 hours) in a measuring flask and
agitated gently until the solution was clear. The limit concentration
remained visually clear throughout the exposure period. The study was
conducted under static conditions with an initial cell density of 6153
cells/mL. The toxicity of a solution with a nominal test item
concentration of 509 mg/L - corresponding to 200 mg test item dry
content/L - was assessed in a limit test. Six replicates were tested for
the test item concentration and for the control, respectively. The
environmental conditions were within the acceptable limits.
The limit test concentration of
disodium (sulphonatothio)acetate; dried and the control was analytically
verified by LC-MS/MS at the start and the end of exposure. The measured
concentration of disodium (sulphonatothio)acetate; dried at the start of
exposure was 108 % of the nominal test item concentration. At the end of
exposure, the measured concentration was 94 % of the nominal test item
concentration. Therefore all effect values are based on the nominal test
item dry content concentration of the test item.
Based on the nominal dry content of the test
item disodium (sulphonatothio)acetate; dried, the NOEC, the ErC10 and
the ErC50 after 72 hours were determined to be greater than 200 mg/L.
Based on the nominal concentrations of the liquid test item (containing
39.3% dry content) disodium (sulphonatothio)acetate; dried the NOEC, the
ErC10 and the ErC50 after 72 hours were determined to be greater than
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