Silicic acid, lead salt

Endpoint summary

Additional information

Toxicity to freshwater organisms

- Acute data:

For fish, 22 individual reliable acute toxicity data points for the freshater species Pimephales promelas were summarized in one data point and put forward for hazard assessment purposes.

The acute toxicity values (96h-LC50) for Pimephales promelas varied between 40.8 µg dissolved Pb/L (at pH 5.67 and hardness of 15.9 mg/L) and 3597.9 µg dissolved Pb/L (at pH 7.1 and hardness of 26 mg/L).

For invertebrates, 22 individual reliable acute toxicity data points for the species Ceriodaphnia dubia were summarized in one data point and put forward for hazard assessment purposes. The acute toxicity values (48h-LC50) for Ceriodaphnia dubia varied between 26.4 µg dissolved Pb/L (at pH 8.1 and hardness of 25 mg/L) and 3115.8 µg dissolved Pb/L (at pH 8.15 and hardness of 103.2 mg/L).

For algae, 7 individual reliable acute toxicity data points for the species Pseudokirchneriella subcapitata were summarized in one data point and put forward for hazard assessment purposes. The acute toxicity values (72h-EC50) for Pseudokirchneriella subcapitata varied between 21.7 µg dissolved Pb/L (at pH 7.28 and hardness of 24 mg/L) and 322.9 µg dissolved Pb/L (at pH 7.34 and hardness of 174.4 mg/L).

For microorganisms, 8 individual reliable acute toxicity data points for 8 different species were summarized in one data point and put forward for hazard assassment purposes. The acute toxicity values (24h-LC50) for the 8 species varied between less than 1.5 mg/L and 5 mg/L.

- Chronic data:

For fish, the high quality chronic freshwater database contains toxicity data towards lead for 6 freshwater fish species (Oncorhynchus mykiss, Salvelinus fontinalis, Pimephales promelas, Lepomis macrochirus, Salvelinus namaycush, Ictalurus punctatus, Salmo salar). No-effect levels for dissolved lead for fish were situated between 18.9 µg Pb/L (Oncorhynchus mykiss; endpoint: scoliosis) and 1558.6 µg Pb/L (Pimephales promelas; endpoint: dry weight).

For invertebrates, the high quality chronic database contains freshwater toxicity data for 2 rotifer species (Philodina rapida; Brachionus calyciflorus), 1 insect (Chironomus tentans), 2 mollusc species (Lymnaea palustris; Lymnaea stagnalis) and 5 crustacean species (Hyalella azteca, Daphnia magna, Ceriodaphnia dubia, Diaphanosoma birgei, Alona rectangula). Chronic freshwater no-effect levels for dissolved lead for invertebrates were situated between 1.7 µg Pb/L (Lymnaea stagnalis; endpoint: growth) and 495.7 µg Pb/L (Ceriodaphnia dubia; endpoint: mortality).

Toxicity to saltwater organisms:

- Chronic data:

For fish, the chronic toxicity database for marine fish contains toxicity data for 1 marine fish (Cyprinodon variegatus). The lowest selected no-effect levels for dissolved lead for this marine fish was 229.6 µg Pb/L (Cyprinodon variegatus; endpoint: dry weight).

For invertebrates, chronic marine NOEC/L(E)C10 values are available for 2 echinoderms (Strongylocentrotus purpuratus, Dendraster excentricus), 3 bivalve molluscs (Mytilus galloprovincialis, Mytilus trossolus, Crassostrea gigas) and 1 annelid (Neanthes arenaceodentata). No-effect levels for dissolved lead for marine invertebrates were situated between 9.2 µg Pb/L (Mytilus trossolus; endpoint: abnormalities) and 1409.6 µg Pb/L (Mytilus galloprovincialis; endpoint: mortality).