Reaction mass of calcium dihydroxide and calcium peroxide

Toxicity to soil macroorganisms except arthropods

Link to relevant study record(s)

Reference

Endpoint:

toxicity to soil macroorganisms except arthropods: short-term

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

other:

Justification for type of information:

JUSTIFICATION FOR DATA WAIVING
Studies on soil organisms are not deemed necessary for both calcium peroxide and calcium hydroxide. On the one hand, calcium peroxide hydrolyses to calcium hydroxide and hydrogen peroxide when it comes into contact with moist. On the other hand, calcium hydroxide reacts with carbon dioxide in the environment to form calcium carbonate, which is one of the most abundant minerals in the earth's crust. Hydrogen peroxide is a short-lived substance in soil, because a rapid degradation will occur due to high concentration of catalytic material (transition metals, enzymes, easily oxidised/reduced organic substances and microbes) available. A prominent representative of soil macro-fauna are earthworms which play an important role in the decomposition of organic material in the soil. These earthworms are also well-equipped with effective antioxidant defenses that may protect them against potentially harmful effects of hydrogen peroxide exposure. Thus, no long-term or irreversible damage to soil organisms as a result of exposure to hydrogen peroxide is expected.

Description of key information

Data waiving (study scientifically not necessary): Studies on soil organisms are not deemed necessary for both calcium peroxide and calcium hydroxide. On the one hand, calcium peroxide hydrolyses to calcium hydroxide and hydrogen peroxide when it comes into contact with moist. On the other hand, calcium hydroxide reacts with carbon dioxide in the environment to form calcium carbonate, which is one of the most abundant minerals in the earth's crust. Hydrogen peroxide is a short-lived substance in soil, because a rapid degradation will occur due to high concentration of catalytic material (transition metals, enzymes, easily oxidised/reduced organic substances and microbes) available. A prominent representative of soil macro-fauna are earthworms which play an important role in the decomposition of organic material in the soil. These earthworms are also well-equipped with effective antioxidant defenses that may protect them against potentially harmful effects of hydrogen peroxide exposure. Thus, no long-term or irreversible damage to soil organisms as a result of exposure to hydrogen peroxide is expected.