Reaction mass of Limestone and calcium fluoride and calcium sulfate

Toxicity to soil macroorganisms except arthropods

Link to relevant study record(s)

Reference

Endpoint:

toxicity to soil macroorganisms except arthropods, other

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Remarks:

Information on the individual constituents is used for the reaction mass

Adequacy of study:

key study

Justification for type of information:

The read-across justification is provided in Section 13.

Reason / purpose for cross-reference:

read-across source

Reason / purpose for cross-reference:

read-across source

Reason / purpose for cross-reference:

read-across source

Reason / purpose for cross-reference:

read-across source

Reason / purpose for cross-reference:

read-across source

Key result

Dose descriptor:

NOEC

Effect conc.:

32 000 mg/kg soil dw

Nominal / measured:

nominal

Conc. based on:

test mat.

Remarks:

reaction mass

Basis for effect:

growth

Remarks on result:

other: No impact shown on growth at highest dose

Conclusions:

From the available information on the consitituents, it can be concluded that the reaction mass will not be toxic to soil macroorganisms. 

Executive summary:

No studies have been conducted on the reaction mass of CaF2, CaSO4 and CaCO3. Instead information is available on the 3 different constituents. 

The toxicity of various fluoride compounds to Eisenia fetida was investigated over a period of 22 weeks (OECD 207) by Vogel and Ottow (1992). The rate of maturity of the earthworms was significantly reduced when sodium fluoride and potassium fluoride was used. The number of hatchlings was reduced in the presence of sodium fluoride, while the number of cocoons was reduced in the presence of a low concentration of sodium fluoride and potasium fluoride . A NOEC (22d) value of 16000 mg/kg soil dw was observed for CaF₂. Based on this NOEC value, the registered substance was found to have no effect on Eisenia fetida.

Also the toxicity of CaCO₃ to the earthworm Eisenia foetidahas been assessed in an OECD 207 study using an artificial soil. The acute toxicity of the test item, gave a 14 day LC50 value of >1000 mg/kg and a NOEC of 1000 mg/kg. There is hence no negative effect observed.

 

Similarly, no toxicity is expected for CaSO4. Calcium sulfate, calcium and sulfate ions are ubiquitous in the environment. Calcium is an important constituent of most soils and the minerals found in soil are mostly compounds of calcium with other substances. Furthermore, calcium sulfate, as gypsum, is used as an inorganic fertiliser to improve soil quality. 

 

From the available information on the consitituents, it can be concluded that the reaction mass will not be toxic to soil macroorganisms. 

 

On the basis of the available NOEC for CaF2, the NOEC value for the reaction mass can be concluded: 32,000 mg RM/kg dw soil. This value is calculated by taking into account that the reaction mass contains only 50% of CaF2 (ca. 47.5 w/w % CaF2) and that the additional of Ca2+ through CaSO4 and CaCO3 would even further reduce the toxicity of CaF2 as free F- will be complexed.

Description of key information

No studies have been conducted on the reaction mass of CaF2, CaSO4 and CaCO3. Instead information is available on the 3 different constituents. 

The toxicity of various fluoride compounds to Eisenia fetida was investigated over a period of 22 weeks (OECD 207) by Vogel and Ottow (1992). The rate of maturity of the earthworms was significantly reduced when sodium fluoride and potassium fluoride was used. The number of hatchlings was reduced in the presence of sodium fluoride, while the number of cocoons was reduced in the presence of a low concentration of sodium fluoride and potasium fluoride . A NOEC (22d) value of 16000 mg/kg soil dw was observed for CaF₂. Based on this NOEC value, the registered substance was found to have no effect on Eisenia fetida.

 

Also the toxicity of CaCO₃ to the earthworm Eisenia foetidahas been assessed in an OECD 207 study using an artificial soil. The acute toxicity of the test item, gave a 14 day LC50 value of >1000 mg/kg and a NOEC of 1000 mg/kg. There is hence no negative effect observed.

 

Similarly, no toxicity is expected for CaSO4. Calcium sulfate, calcium and sulfate ions are ubiquitous in the environment. Calcium is an important constituent of most soils and the minerals found in soil are mostly compounds of calcium with other substances. Furthermore, calcium sulfate, as gypsum, is used as an inorganic fertiliser to improve soil quality. 

 

From the available information on the consitituents, it can be concluded that the reaction mass will not be toxic to soil macroorganisms. 

 

On the basis of the available NOEC for CaF2, the NOEC value for the reaction mass can be concluded: 32,000 mg RM/kg dw soil. This value is calculated by taking into account that the reaction mass contains only 50% of CaF2 (ca. 47.5 w/w % CaF2) and that the additional of Ca2+ through CaSO4 and CaCO3 would even further reduce the toxicity of CaF2 as free F- will be complexed.

 

Key value for chemical safety assessment

Long-term EC10, LC10 or NOEC for soil macroorganisms:

32 000 mg/kg soil dw