Tetrachloro-μ-hydroxy(μ-methacrylato-O:O')dichromium

Ecotoxicological Summary

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:

PNEC aqua (freshwater)

PNEC value:

0 mg/L

Assessment factor:

1 000

Extrapolation method:

assessment factor

PNEC freshwater (intermittent releases):

0.004 mg/L

Marine water

Hazard assessment conclusion:

PNEC aqua (marine water)

PNEC value:

0 mg/L

Assessment factor:

10 000

Extrapolation method:

assessment factor

PNEC marine water (intermittent releases):

0.004 mg/L

STP

Hazard assessment conclusion:

PNEC STP

PNEC value:

100 mg/L

Assessment factor:

10

Extrapolation method:

assessment factor

Sediment (freshwater)

Hazard assessment conclusion:

PNEC sediment (freshwater)

PNEC value:

0.289 mg/kg sediment dw

Extrapolation method:

equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:

PNEC sediment (marine water)

PNEC value:

0.029 mg/kg sediment dw

Extrapolation method:

equilibrium partitioning method

Hazard for air

Air

Hazard assessment conclusion:

no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:

PNEC soil

PNEC value:

0.057 mg/kg soil dw

Extrapolation method:

equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:

no potential for bioaccumulation

Additional information

The PNEC derivation was as follows justified:

PNEC freshwater sediment

K_(susp-water) = 182

RHO_(susp) = 1150

Conversion factor (wwt -> dwt): 4.6

PNEC_freshwater sediment

= (K_(susp-water)/ RHO_(susp)) * PNEC_freshwater * 1000

= (182/1150) * 0.000397 * 1000

= 0.0628 mg/kg wwt

= 0.28888 mg/kg dw

PNEC marinewater sediment

K_(susp-water) = 182

RHO_(susp) = 1150

Conversion factor (wwt -> dwt): 4.6

PNEC_marinewater sediment

= (K_(susp-water)/ RHO_(susp)) * PNEC_marinewater * 1000

= (182/1150) * 0.0000397 * 1000

= 0.0062 mg/kg wwt

= 0.02852 mg/kg dw

PNECsoil

K_(soil-water) = 217

RHO_(soil) = 1700

Conversion factor (wwt -> dwt): 1.13

PNEC_soil

= (K_(soil-water)/ RHO_(soil)) * PNEC_freshwater * 1000

= (217/1700) * 0.000397 * 1000

= 0.0506 mg/kg wwt

= 0.057178 mg/kg dw

Conclusion on classification

Aquatic acute toxicity

48 h, EC50 (Daphnia magna): 111 mg/L (measured, not specified)

96 h, ErC50 (Scenedesmus capricornutum): 397 µgL (nominal, based on chromium(III))

96 h, LC50 (Oncorhynchus mykiss): 11.2 mg/L (nominal)

 

Aquatic chronic toxicity

96 h, NOEC (Scenedesmus capricornutum): 0.08 mg/L (nominal, based on chromium(III))

 

Biodegradation: readily biodegradable: 79.6 % biodegradation after 28 days (based on measured COD; according to OECD 301 D, EU C.4 E and OPPTS 835.3110)

Partition coefficient: log Pow = 0.28 at 25 °C

Classification, Labelling, and Packaging Regulation (EC) No 1272/2008

The available experimental test data are reliable and suitable for classification purposes under Regulation (EC) No 1272/2008. The test substance was found to be readily biodegradable under the test conditions (79.6 % biodegradation after 14 days). The most sensitive test for the aquatic compartment was the toxicity test to aquatic algae (Scenedesmus capricornutum). The test revealed a 96-h NOEC and EC50 of 0.08 mg/L and 397 µgL (nominal, based on chromium(III)). The log Pow was calculated to be 0.28 at 25 °C. Based on these results, the substance is classified as short term (acute) aquatic toxicity Category 1 (H400: Very toxic to aquatic life) and long term (chronic) aquatic toxicity Category 2 (H411: Toxic to aquatic life with long lasting effects) according to Regulation (EC) No 1272/2008 (CLP) as amended for the tenth time in Commission Regulation (EU) 2017/776. According to section 4.1.6 in ECHA Guidance on the Application of the CLP Criteria (version 5.0, July 2017), the substance is labeled with H410: Very toxic to aquatic life with long lasting effects.