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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

No data on aquatic toxicity is available for sodium 2 -mercaptoethanolate. Read across can however be made to 2- mecaptoethanol (CAS 60 -24 -2). The (sodium) 2-mercapthoethanolate ion is a conjugated base, the read across substance 2-mercaptoethanol its undissociated acid. With a pKa value of ca. 9.5 in an aqueous environment with pH 7 the substance will be present almost exclusively as 2-mercaptoethanol. Further, no effects on aqueous toxicity from the sodium cation is to be expected.

Overview of key aquatic toxicity data:

Study

Species

Guideline

Endpoint

Effect value *

Fish

short-term toxicity

L. idus

DIN 38412 (part 15)

96-h LC50

32.3 mg/L

Fish

long-term toxicity

-

-

-

-

Aq. invertebrates

short-term toxicity

D. magna**

OECD 202

48-h EC50

0.15 mg/L

Aq. invertebrates

long-term toxicity

D. magna

OECD 211

21-d NOEC

0.08 mg/L

Algae toxicity

S. capricornutum***

OECD 201

72-h ErC50

72-h NOErC

0.22 mg/L

0.074 mg/L

STP microorganisms toxicity

P. putida

DIN 38412 (part 8)

17-h EC50

17-h EC10

160.2 mg/L

76.9 mg/L

*  corrected for molecular weight difference (read-across)

** species not specified; Daphnia magna is the usual species in studies by Japanese authorities

*** species not specified; Selenastrum capricornutum is the usual species in studies by Japanese authorities