Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
2.1 mg/L
Assessment factor:
10
Extrapolation method:
assessment factor

Marine water

Hazard assessment conclusion:
no data: aquatic toxicity unlikely

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
4.2 mg/L
Assessment factor:
10
Extrapolation method:
assessment factor

Sediment (freshwater)

Hazard assessment conclusion:
PNEC sediment (freshwater)
PNEC value:
2 720 mg/kg sediment dw
Assessment factor:
1
Extrapolation method:
equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:
no hazard identified

Hazard for air

Air

Hazard assessment conclusion:
no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
PNEC soil
PNEC value:
329 mg/kg soil dw
Assessment factor:
1
Extrapolation method:
equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

PNEC sediment:


The PNECsediment can be derived from the PNECaquatic using the equilibrium partitioning method (EPM).


A distribution/partition coefficient (KD) between the water and sediment compartment for strontium has been determined. This resulted in a typical KD, susp-water of 1,291.8 L/kg (logKD: 3.11). In a first step the units have to be converted from L/kg to m3/m3 using the formula below.


KD, susp-water(m3/m3) = 0.9 + [0.1 x (KD, susp-water(L/kg) x 2,500) / 1,000]


This results in a KD, susp-matter of 323.9 m3/m3. This value can be entered in the equation below to calculate the PNECsediment:


PNECsediment = (KD, susp-water/ RHOsusp) x PNECaquatic x 1,000


with the PNECaquatic expressed as mg/L, RHOsusp representing the bulk density of wet suspended matter (freshly deposited sediment) (1,150 kg/m3), and a KD, susp-water of 323.9 m3/m3, a PNECsediment that is expressed as mg/kg wet weight can be derived. This value can be converted to a dry weight-based PNEC, using a conversion factor of 4.6 (CONVsusp = RHOsusp/Fsolid-susp * RHOsolid) kg wet weight/ kg dry weight.


This results in a PNECsediment of 2,720 mg Sr/kg dry sediment


PNEC soil:


The PNECsoil can be derived from the PNECaquatic using the equilibrium partitioning method (EPM).


A distribution/partition coefficient (KD) between the water and soil compartment was derived for strontium of 157.03 L/kg (Log KD: 2.2). In a first step the units have to be converted from L/kg to m3/m3 using the formula below.


KD,soil (m3/m3) = 0.2 +[0.6 x (KD,soil (L/kg) x 2,500) / 1,000]


This results in a KD,soil of 235.75 m3/m3. This value can be entered in the equation below to calculate the PNECsoil


PNECsoil = (KD,soil/ RHOsoil) x PNECaquatic x 1,000


With the PNECaquatic expressed as mg/L, RHOsoil representing the bulk density of wet soil (1,700 kg/m3) and KD,soil is 157.03 m3/m3, a PNECsoil expressed as mg/kg wet weight is derived. This value can be converted to a dry weight-based PNEC, using a conversion factor of 1.13 kg wet weight/ kg dry weight.


 


This results in a PNECsoilof 329 mg Sr/kg dry soil

Conclusion on classification

Short-term toxicity EC/LC50 values of Sr available for 3 trophic levels are situated between >40.3 mg Sr/L and >125 mg Sr/L, corresponding to > 55.9 mg/L and 173.6 mg/L strontium hydroxide based on an average Sr content of 72%. In accordance with Regulation (EC) No 1272/2008, Table 4.1.0 (a), classification for acute aquatic hazard is not required for strontium hydroxide as all EC50/LC50 values are above the classification criteria of 1 mg/L.

Long-term toxicity data are available for three trophic levels and range from 21 mg Sr/L to ≥ 43.3 mg Sr/L, corresponding to 29.2 mg/L and 60.1 mg/L strontium hydroxide based on an average Sr content of 72%. In accordance with Regulation (EC) No 1272/2008, Table 4.1.0 (b) (i), classification for chronic aquatic hazard is not required for strontium hydroxide as all chronic EC10/NOEC values are above the classification criteria of 1 mg/L.