Registration Dossier

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

The test substance is known to rapidly hydrolyse in contact with water to form boric acid (CAS 10043-35-3), acetic acid (CAS 64-19-7), sodium acetate (CAS 127-09-3 ), and hydrogen (CAS 1333-74-0). For the hydrolysis products boric acid, acetic acid and sodium acetate relevant aquatic toxicity data was gathered from the ECHA dissemination dossier (d.d. 2014 -11 -19) and tabulated below.

Aquatic toxicity data for boric acid:

Study

Species

Endpoint

Effect value

Fish acute toxicity

L. limanda (salt water)

96-h LC50

74 mg/L*

Fish chronic toxicity

I. punctatus

9-d LC10

3.5 mg/L**

Aquatic invertebrates acute toxicity

H. azteca

96-h LC50

64 mg/L***

Aquatic invertebrates chronic toxicity

D. magna

21-d NOEC

6 mg/L****

Algae acute

S. capricornutum

72-h EC50

52.4 mg/L *****

Algae chronic

S. capricornutum 

72-h NOEC

17.5 mg/L *****

 Micro organisms  O. bimarginata  72 h NOEC  10 mg/L ******

* lowest effect concentration of two WoE endpoints.

** lowest effect value of a total of 11 WoE endpoints for both boric acid and various boron/borate species.

*** lowest effect concentration of a total of 23 WoE endpoints for both boric acid and various boron/borate species.

**** lowest effect concentration of a total of 10 WoE endpoints for both boric acid and various boron/borate species.

***** lowest effect concentrations from one of two WoE endpoints.

****** lowest effect concentration from a total of 9 WoE enpoints for both boric acid and various boron/borate species.

Aquatic toxicity data for acetic acid:

Study

Species

Endpoint

Effect value

Fish acute toxicity

O. mykiss

96 -h LC50

>300.82 mg/L *

Aquatic invertebrates acute toxicity

D. magna

48 -h EC50

>300.82 mg/L *

Algae acute

S. costatum

72 -h EC50

>300.82 mg/L * / **

 Micro organisms  P. putida  16 -h NOEC  850 mg/L***

* Tests performed with potassium acetate, values for acetate ion.

** Two key studies available however, one graded reliability 4.

*** Supporting study, no key study available. Two effect values were stated in the record. Lowest has been selected.

Aquatic toxicity data for sodium acetate:

Study

Species

Endpoint

Effect value

Fish acute toxicity

D. rerio

96 -h LC50

>100 mg/L

Aquatic invertebrates acute toxicity

D. magna

48 -h EC50

>1000 mg/L *

Algae acute

S. costatum

72 -h EC50

>417.92 mg/L**

 Algae chronic

S. costatum

 72 -h NOEC  417.92 mg/L**
 Micro organisms  P. putida  16 -h EC50  7200 mg/L

* Two key studies available, value of test with sodium acetate selected.

** Read-across with potassium acetate. Values have been corrected for molecular weight of sodium acetate.