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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Ecotoxicological Summary

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Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
0.93 mg/L
Assessment factor:
10
Extrapolation method:
assessment factor
PNEC freshwater (intermittent releases):
0.8 mg/L

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
0.093 mg/L
Assessment factor:
100
Extrapolation method:
assessment factor
PNEC marine water (intermittent releases):
0.08 mg/L

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
270 mg/L
Assessment factor:
1
Extrapolation method:
assessment factor

Sediment (freshwater)

Hazard assessment conclusion:
no exposure of sediment expected

Sediment (marine water)

Hazard assessment conclusion:
no exposure of sediment expected

Hazard for air

Air

Hazard assessment conclusion:
no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
no exposure of soil expected

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

PNEC Freshwater

Reliable long-term data was available for a fish, invertebrate and algae. The lowest NOEC of 9.3 mg/L was a result for testing with Gammarus pseudolimnaeus (Arthur et al. 1974). An assessment factor of 10 was used as per Part R.10 Guidance for a resulting PNEC for intermittent releases of 0.93 mg/L.

PNEC Marine

Reliable long-term data was available for a fish, invertebrate and algae for freshwater. The lowest NOEC of 9.3 mg/L was a result for testing withGammarus pseudolimnaeus(Arthur et al. 1974). An assessment factor of 100 was used as per Part R.10 Guidance for a resulting PNEC for intermittent releases of 0.093 mg/L.

PNEC STP

Swisher et al (1967) provided the only reliable study with STP organisms for which the PNEC could be determined. Results from this test indicated a NOEC of 200 mg/L for exposure of activated sludge organisms to H3NTA. Therefore, the read-across approach was used to apply results from the Swisher et al. study for PNEC calculation for Na3NTA, resulting in a NOEC of 270 mg/L for Na3NTA. As per Part R.10 Guidance, an assessment factor of 1 was used. Although other data with protozoans and Pseudomonas were available, these studies were deemed unreliable or not relevant to PNEC STP. However, they provide support that a PNEC of 200 mg/L would be protective of microorganisms. EU Risk Assessment (2005) presents a PNEC STP of 540 mg/L for a study performed with Chilomonas paramaecium. This protazoan is a flagellate and not a cilliate and therefore, not relevant to STP. Use of flagellate organisms are not listed in the Part R.10 Guidance.

PNEC Intermittent

Reliable short-term data was available for a fish, invertebrate and algae. The lowest LC50 of 80 mg/L was a result for testing with Gammarus pseudolimnaeus (Arthur et al. 1974). An assessment factor of 100 was used as per Part R.10 Guidance for a resulting PNEC for intermittent releases of 0.8 mg/L. The EU Risk Assessment 2005 did not present a PNEC for intermittent releases.

Conclusion on classification