Fatty acids, C16-18, reaction products with triethanolamine, di-Me sulfate-quaternized

Short-term toxicity to fish

Link to relevant study record(s)

Reference

Endpoint:

short-term toxicity to fish

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Justification for type of information:

REPORTING FORMAT FOR THE ANALOGUE APPROACH

1. HYPOTHESIS FOR THE ANALOGUE APPROACH
This read-across is based on the hypothesis that source and target substances have similar (eco)toxicological properties because
• they share structural similarities with common functional groups: One quaternised ethanolamine moiety, one to three, mainly two ester groups with a typical UVCB distribution with long-chain fatty acids of natural origin. The molecular structure is almost identical.
• they are manufactured from similar resp. identical precursors (triethanolamine, long-chain fatty acids, dimethyl sulphate) under similar conditions. Therefore, common breakdown products via physical and biological processes, which result in structurally similar chemicals are evident
• A constant pattern in the changing of the potency of the properties across the TEA-Esterquats by chain-length and the grade of esterification is not observed, because the fatty acid chain-length distribution is too narrow and similar and the distribution of mono-, di-, and tri-esters is identical. Some variation caused by variation in C=C double bonds may occur and will be discussed at the relevant endpoint.

2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
See justification for read-across attached to chapter 13 of this IUCLID file.

3. ANALOGUE APPROACH JUSTIFICATION
See justification for read-across attached to chapter 13 of this IUCLID file.

4. DATA MATRIX
See justification for read-across attached to chapter 13 of this IUCLID file.

Reason / purpose for cross-reference:

read-across: supporting information

Reason / purpose for cross-reference:

read-across source

Reason / purpose for cross-reference:

read-across source

Reason / purpose for cross-reference:

read-across source

Reason / purpose for cross-reference:

read-across source

Reason / purpose for cross-reference:

read-across source

Reason / purpose for cross-reference:

read-across source

Duration:

96 h

Dose descriptor:

NOEC

Effect conc.:

1.51 mg/L

Nominal / measured:

meas. (not specified)

Conc. based on:

test mat.

Basis for effect:

mortality (fish)

Key result

Duration:

96 h

Dose descriptor:

LC50

Effect conc.:

1.91 mg/L

Nominal / measured:

meas. (geom. mean)

Conc. based on:

test mat.

Basis for effect:

mortality (fish)

Remarks on result:

other: --

Duration:

96 h

Dose descriptor:

LC100

Effect conc.:

2.42 mg/L

Nominal / measured:

meas. (not specified)

Conc. based on:

test mat.

Basis for effect:

mortality (fish)

Duration:

72 h

Dose descriptor:

LC50

Effect conc.:

1.91 mg/L

Nominal / measured:

meas. (geom. mean)

Conc. based on:

test mat.

Basis for effect:

mortality (fish)

Remarks on result:

other: --

Duration:

48 h

Dose descriptor:

LC50

Effect conc.:

1.91 mg/L

Nominal / measured:

meas. (geom. mean)

Conc. based on:

test mat.

Basis for effect:

mortality (fish)

Remarks on result:

other: --

Duration:

24 h

Dose descriptor:

LC50

Effect conc.:

2 mg/L

Nominal / measured:

meas. (geom. mean)

Conc. based on:

test mat.

Basis for effect:

mortality (fish)

Remarks on result:

other: 95% CL: 1.82-2.19 mg/l

Details on results:

Results based on nominal concentrations:
96h-LC50 = 3.24 mg/l**
72h-LC50 = 3.24 mg/l**
48h-LC50 = 3.24 mg/l**
24h-LC50 = 3.39 mg/l* (95% CL: 3.09 - 3.72)
96h NOEC = 2.56 mg/l ***

* calculated using Spearman-Karber estimator
** calculated using the geometric mean between the LC0 and LC100
*** not specified

Conclusions:

Based on read-across, the 96 h LC50 is 1.91 mg/l

Description of key information

96 h LC50 = 1.91 mg a.i/L, based on mean measured concentration (OECD TG 203, Oncorhynchus mykiss); GLP; RL1; read-across: partially unsaturated TEA-Esterquat 

Key value for chemical safety assessment

Fresh water fish

Fresh water fish

Dose descriptor:

LC50

Effect concentration:

1.91 mg/L

Additional information

One short-term toxicity study is available for the target substance fully saturated TEA-Esterquat. Further studies are available for the source substance partially unsaturated TEA-Esterquat. A justification for read-across is attached to Iuclid section 13.

In a 96-h acute toxicity study according to OECD TG 203 fully saturated TEA-Esterquat was not found to be toxic to zebrafish after 96 h when testing at the saturated solution level containing 8.9 mg/l DOC. A reliability of 3 was assigned, because no analytical control was performed at the end of the test.

 

In a 96-h acute toxicity study according to OECD TG 203, rainbow trouts (Oncorhynchus mykiss) were exposed to oleic acid-based TEA-Esterquat at nominal concentrations of 1.0, 1.8, 3.2, 5.6, 10 mg/L under semi-static conditions.  The 96-h LC50 was 4.8 mg/L with 95% CL= 4.1-5.6 mg/L.

 

In a 96-h acute toxicity study conducted according to OECD Guideline 203 (Fish, Acute Toxicity Test), rainbow trouts (Oncorhynchus mykiss) were exposed to partially unsaturated TEA-Esterquat (CAS No. 157905-74-3) at nominal concentrations of 0 (control), 1.0, 1.6, 2.56, 4.1, 6.55, 10.55 mg/L under semi-static conditions. The mean measured concentration was determined to be 59 % of nominal concentrations. The 96-h LC50 was 1.91 mg/L (based on mean measured concentration). Sublethal effects as difficulties with maintainance of balance and unusual behaviour (reduced activity and or orientation to bottom or surface of the test vessels) were observed within the first three hours in the highest test concentration  

 

In a further study performed according to OECD Guideline 203 (Fish, Acute Toxicity Test) under semi-static conditions the LC50 (96 h) of partially unsaturated TEA-Esterquat was determined to be 2.1 mg/L for Danio rerio. The effect concentration (96h-LC50 = 2.6 mg/L) was corrected because the analytical recovery (HPLC) of test substance was below 80% of nominal concentration.

Partially unsaturated TEA-Esterquat was classified as toxic to Danio rerio by the study authors. However, according to CLP (EU-GHS), Regulation (EC) No 1272/2008 the criteria for acute aquatic toxicity of fish (96h LC50) is </= 1 mg/L.

 

There are two further reliable studies available for partially unsaturated TEA-Esterquat performed according to OECD Guideline 203 (Fish, Acute Toxicity Test) under semi-static conditions and a study according to OECD Guideline 204 (Fish, Prolonged Toxicity Test: 14-day Study) under flow-through conditions, but all performed without analytical control. The LC50 (96 h) effect concentrations were 7.48 mg/L (test mat., nominal, based on a.i. > 80 % the 96h LC50 was > 5.98 mg a.i./L) for Danio rerio and 11.23 mg a.i./L and 14.45 mg a.i./L for Oncorhynchus mykiss each, respectively. The nominal effect concentrations were corrected for the content of active ingredient.

 

One study is available for Leuciscus idus (Golden orfe). In this study the 24 to 96 h LC 50 of TEA-Esterquat partially unsaturated was 5.1 mg test mat./L (nominal).

 

In a flow through test according to OECD Guideline 204 (Fish, Prolonged Toxicity Test: 14-day Study, 1984) the 96 h and 14 d LC50 of partially unsaturated TEA-Esterquat were 4.9 mg/L each (nominal) for Danio rerio.

 

The lowest 96 h LC50 in fish of 1.91 mg/L obtained in rainbow trouts (Oncorhynchus mykiss) with the source substanc epartially unsaturated TEA-Esterquat will be used for chemical safety assessment.