Registration Dossier

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Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
0.68 mg/L
Assessment factor:
1 000
Extrapolation method:
assessment factor
PNEC freshwater (intermittent releases):
6.8 mg/L

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
0.068 mg/L
Assessment factor:
10 000
Extrapolation method:
assessment factor

STP

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

Sediment (freshwater)

Hazard assessment conclusion:
insufficient hazard data available (further information necessary)

Sediment (marine water)

Hazard assessment conclusion:
insufficient hazard data available (further information necessary)

Hazard for air

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
insufficient hazard data available (further information necessary)

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

 Potassic extracts is a multiconstituent substance. As its main constituents are simple inorganic salts (i.e. potassium sulfate, sodium sulfate and calcium sulfate), in aquatic environment, the soluble portion of each constituent completely dissociates into the sulfate ion (SO42-) and the corresponding cations: potassium (K+), sodium (Na+) and calcium (Ca2+) at neutral pH.

 

Although calcium sulfate is less soluble than the other constituents of the potassic extracts, its water solubility is sufficiently high to determine the absence of toxicity to aquatic organims at concentration higher than 100 mg/L, showing absence of harmful effect to the tested organisms, as it is also showed for the other constituents. The other physico-chemical properties of the constituents are similar: high melting point (> 880°C), high boiling point or decomposition before boiling, vapour pressure expected to be extremely low.

 

Based on the above information, the results obtained on the main individual salts present in the potassic extracts are used in a read-across approach to assess the toxicity of the multiconstituent substance. In a worst case approach, the lowest L(E)C50 value obtained on the three main constituents has been used to derive the PNEC value of the multiconstituent substance. It should be noted that for aquatic organisms, potassium sulfate was found to be the most toxic of the three salts and it is also the major constituent of the substance. Therefore, the use of its toxicity result to determine the PNEC value of the substance is considered as relevant.

Conclusion on classification

As the main constituents of potassic extracts are basic inorganic salts which totally dissociate into potassium, sodium, calcium and sulfate ions in water, no biodegradation potential and logKow can be determined. However, these salts are considered to have a low potential for bioaccumulation in organisms.

Based on the available data, the lowest L(E)C50 to aquatic organisms obtained on the main constituents of potassic extracts is above 100 mg/L.

Therefore, according to the Directive 67/548/EC, potassic extracts is not classified as dangerous for the environment.

Additionally, according to the Regulation (EC) No 1272/2008 (CLP), potassic extracts is not classified as hazardous to the aquatic environment.