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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Additional information

For HYEQS three terrestrial trophic levels are covered with the available tests

1) AUTOTROPHS (Producer)

Terrestrial plants (Avena sativa – oat, Lactuca sativa – lettuce), OECD 208, chronic test

2) HETEROTROPHS (Consumer)

Earthworm (Eisenia fetida), OECD 207 (acute) & OECD 222 (chronic)

3) DETRITIVORS (Decomposer)

Soil microorganisms, OECD 216 (chronic)

Arthropods like Collembola folsomia (springtails) belong to Heterotrophs which are already covered by the available tests. In addition HYEQS is rapidly biodegraded in soil with a half-life of 6d which ensures low exposure levels in soil. Therefore testing of arthropods were not carried out.


Plants are most sensitive to HYEQS. Chronic toxicity results for plants from an OECD 208 study were derived statistically as EC10 for the most sensitive endpoint growth.


In Table 6.3 the different test results for the terrestrial compartment are given.

Table 6.3        HYEQS Acute and Chronic terrestrial toxicity results

Acute earthworm Eisenia fetida LC50 (14d) 1000 mg/kg dw. OECD 207
Chronic earthworm  Eisenia fetida NOEC (56d) lowest 125 mg/kg dw. OECD 222
Chronic plant Avena sativa NOEC (14d) growth 6.1 mg/kg dw. OECD 208
Chronic plant Lactuca sativa NOEC (14d) growth 10.3 mg/kg dw. OECD 208
Chronic soil microorg   NOEC (28d) 1000 mg/kg dw. OECD 216