Registration Dossier
Registration Dossier
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EC number: 931-275-3 | CAS number: 1125503-33-4
Endpoint summary
Administrative data
Description of key information
Additional information
Cationic surfactants like HYEQS 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 negligible the nominal concentrations at test begin can be used to derive the L(E)Cx values. Aquatic studies not addressing this difficult behaviour of cationics in aqueous test systems may result in effect values being unrealistically low especially when a (geometric) mean concentration from start and end concentration is calculated.
For all three trophic levels (fish, daphnia and algae) acute and chronic data are available. HYEQS is most toxic to algae. For algae five valid studies are available. Three of them have the validity score (1) ‘valid without restrictions’ and these are considered for the derivation of the PNECaquatic.
In Table 5.1 the different test results which are most relevant are given. Some studies were carried out with a 40% aqueous solution. The results from these studies are normalized on active ingredient.
Table 5.1 Test results from HYEQS - most relevant Acute and Chronic aquatic tests (results are based on active ingredient (a.i.))
| Species | Species type | Endpoint | Value | Unit | Guideline |
| Acute fish | Danio rerio | LC50 (96h) | 4.20 | mg/l | OECD 203 |
| Acute Daphnia | Daphnia magna | EC50 (48h) | 0.19 | mg/l | OECD 202 |
| Algae | Chlorella vulgaris | ErC50 (72h) | 0.90 | mg/L | OECD 201 |
| Algae | Desmodesmus subspicatus | ErC50 (72h) | 0.14 | mg/l | OECD 201 |
| Sludge respiration inh | EC50 (3h) | 19 | mg/l | OECD 209 | |
| Chronic fish | Danio rerio | NOEC (28d) | 0.16 | mg/L | OECD 210 |
| Chronic daphnia | Daphnia magna | NOECrepro (21d) | 0.10 | mg/L | OECD 211 |
| Chronic Algae | Chlorella vulgaris | ErC10 (72h) | 0.55 | mg/L | OECD 201 |
| Chronic Algae | Desmodesmus subspicatus | ErC10 (72h) | 0.04 | mg/L | OECD 201 |
| Chronic Algae | Periphyton | NOEC (lowest, 28d) | 0.02 | mg/L | no Guideline |
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