Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Cationic surfactants like C20/22 ATQ are difficult to test in the aquatic compartment as they are sorbing strongly to solids. Normally the analytical recovery of the cationic is good at the beginning of the test but at the end of the test recovery is often below the acceptable minimum recovery. Lowering of the recovery could be related to sorption of the substance to the test container walls but sorption occurs also to the negatively charged surface of the test organism e.g. of algae or fish. Substance sorbed to the organism means the substance is still present in the test system and if it is demonstrated that sorption to the test container walls is neglectable the nominal concentrations at test begin can be used to derive the L(E)Cx values. If this is not the case the geometric mean of the concentration at the test begin and end can be used.

Aquatic studies not addressing this difficult behaviour of cationics in aqueous test systems may result in effect values being unrealistically low.

For all three trophic levels (fish, daphnia and algae) acute and chronic data are available. C20/22 ATQ is most toxic to daphnia. For daphnia one acute and one chronic study is available. The chronic 21d Daphnia reproduction study is the basis for the PNECaquatic, together with the chronic fish study and the ErC10 Algae which results in an Application factor of 10. 

In Table 6.1-1 the different test results which are most relevant are given. All aquatic studies were carried out with active ingredient (a.i). 

Table 6.1-1    Test results from C20/22 ATQ - most relevant Acute and Chronic aquatic tests (active ingredient (a.i.))

Test type

Test medium

Species

Effect

 

 

Guideline

Acute fish

River water

Danio rerio

LC50 (96h)

3.5

mg/l

OECD 203

Acute Daphnia

River water

Daphnia magna

EC50 (48h)

1.4

mg/l

OECD 202

Algae

River water

Desmodesmus subspicatus

ErC50 (72h)

3.4

mg/l

OECD 201

Sludge respiration inh

Tap water

Non-adapted sludge

EC50 (3h)

43

mg/l

OECD 209

 

 

 

 

 

 

 

Chronic fish

River water

Danio rerio

NOEC (9d)

240

µg/L

OECD 212

Chronic daphnia

River water

Daphnia magna

NOECrepro (21d)

119

µg/L

OECD 211

Chronic Algae

River water

Desmodesmus subspicatus

ErC10 (72h)

780

µg/L

OECD 201

Additional information