Registration Dossier

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

Justification for Read across to other Glymes

Monoglyme (CAS No. 110 -71 -4 ), Diglyme (CAS No. 111 -96 -6) and Triglyme (CAS No. 112 -49 -2) are already registered under REACH. These substances are chain homologues of the registration substance Tetraglyme (CAS No. 143 -24 -8). All these Glymes which differ in their structure by the number of the repeating group OCH2CH2 (n=1 -4) have very low acute and chronic ecotoxicity which are in most cases in the same order of magnitude. For Tetraglyme the acute and chronic data from Di- and Triglyme were used for read across.To confirm acceptability of the read across acute daphnia and algae tests were carried out for Tetraglyme. In the table below all available acute an chronic ecotoxicity studies for Glymes are summarized to demonstrate the applicability of the read across.

SPECIES GUIDELINE ENDPOINT MONOGLYME DIGLYME TRIGLYME TETRAGLYME
      mg/L mg/L mg/L mg/L
             
Acute Fish OECD 203 LC50 (96h) >5000 (Tri-G) >5000 (Tri-G) >5000 >5000 (Tri-G)
             
Acute Daphnia OECD 202 EC50 (48h) 4000 943 >5000 5000
             
Algae OECD 201 ErC50 (72h) 9120 >10,000 >6000 8996
             
Microorganisms OECD 209 EC50 (3h) >6400 >5000 >5000 >5000 (Tri-G)
    NOEC (3h) 200 1067 >5000 >5000 (Tri-G)
             
Chronic Daphnia OECD 211 NOEC (21d) 320 (Di-G) 320 320 (Di-G) 320 (Di-G)
             
Algae OECD 201 ErC10 (72h) 3793 8318 3000 2871

(Di-G) means read across from Digylme, (TriG) means read across from Triglyme

SHORT-TERM TOXICITY

For Tetraglyme short-term aquatic ecotoxicity studies for all three trophic levels (fish, daphnia and algae) are available as well as studies on sludge respiration inhibition.

 Fish:  OECD 203   LC50 (96h)   > 5000 mg/L   Read across Tri-G
 Daphnia:  OECD 202  EC50 (48h)   5000 mg/L  Key Study
 Algae:  OECD 201  ErC50 (72h)   8996 mg/L  Key Study
 Microorganisms (Sludge)  OECD 209  NOEC (3h)  > 5000 mg/L  Read across Tri-G
     EC50 (3h)  > 5000 mg/L  Read across Tri-G

Tri-G means Trigylme

The short-term ecotoxicity data were used for the derivation of the PNEC aqua intermittent release (see Section 6 Tetraglyme PNEC).

LONG-TERM TOXICITY

Read across from Diglyme 21d Daphnia study

For reasons given in the waiving statements Section 6.1.2 no long-term fish toxicity tests were carried out. Instead a Diglyme long-term invertebrate study with daphnia was established. This 21d daphnia study with Diglyme (REACH Registration No. 01-2119485900-34-0000) was used for read across to Tetraglyme (see Section 6.1.4) for justification.

Algae: OECD 201   ErC10 (72h) 2871 mg/L   Key Study
 Daphnia:  OECD 211  NOEC (21d)   320 mg/L  Read Across from Diglyme

The algae ErC10 (72h) and the daphnia NOEC (21d) were used to derive the PNEC aqua for continous release (see Section 6 Tetraglyme PNEC).