Reaction mass of disodium sulphide and sodium carbonate and sodium hydroxide

Toxicity to aquatic algae and cyanobacteria

Administrative data

Endpoint:

toxicity to aquatic algae and cyanobacteria

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Justification for type of information:

For this endpoint, an analysis based on the components is performed. Based on SIDS report on Sodium carbonate no acute toxicity was observed on the three trophic levels, including the algae. Based on the SIDS report and EU-RAR about sodium hydroxide, no acute toxicity was observed on the three trophic levels, including the algae. For Na2S, based on registration dossier data, algae toxicity was observed, with an EC50 of 0.104 mg/L. Several other data are available in the registration dossier. The conclusion is that for the multi-constituent, an algae toxicity is taken into account based on Na2S.

Data source

Reference

Reference Type:

publication

Title:

The effect of dissolved H2S and CO2 on short-term photosynthesis of skeletonema costatum a marine diatom

Author:

Breteler et al

Year:

1991

Bibliographic source:

Plants for toxicity assessment

Materials and methods

Test guideline

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 201 (Alga, Growth Inhibition Test)

Deviations:

not specified

GLP compliance:

not specified

Test material

Test material information

Constituent 1

Reference substance name:

sodium sulfide nonahydrate

IUPAC Name:

sodium sulfide nonahydrate

Results and discussion

Effect concentrations

Duration:

4 h

Dose descriptor:

EC50

Effect conc.:

0.104 mg/L

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Conclusions:

For the multi-constituent based on Na2S registration data, the algae EC50 = 0.104 mg/L