Manganese neodecanoate

Endpoint summary

Description of key information

Soil toxicity studies with manganese neodecanoate are not available. In the assessment of manganese neodecanoate, read-across to the assessment entities soluble manganese substances and neodecanoic acid is applied since the ions of manganese neodecanoate determine its fate and toxicity in the environment.

Reliable data indicate that the moiety of ecotoxicological concern are manganese cations. Chronic effect concentrations are available for macroorganisms, plants and soil microorganisms, i.e. the lowest respective endpoints are the 28-d NOEC of 157 mg Mn/kg soil dw for Enchytraeus crypticus (annelid), the 23-d NOEC of 322 mg Mn/kg soil dw for Lactuca sativa (plant) and the 28-h NOEC of 207 mg Mn/kg soil dw for nitrogen mineralization. The lowest NOEC of 207 mg Mn/kg soil corrected for organic carbon content of 2.8 % amounts to 251 mg Mn/kg soil. On the contrary, soil arthropods do not appear to be sensitive to manganese since the lowest endpoint, i,e. the 28-d NOEC for Folsomia candida, is above 1000 mg/kg, the OECD test limit for soil toxicity tests.

Neodecanoate is mobile and does not have a high potential to partition into soil. Data on the toxicity to aquatic microorganisms, algae and invertebrates point to a low (if any) toxic potential. The QSAR-based estimation for toxicity of neodecanoic acid (CAS 26896-20-8) to earthworms performed with ECOSAR v1.11 (EPISuite v4.00) results in a 14-d LC50 of 1934 mg neodecanoic acid/L. Thus, toxicity towards terrestrial invertebrates appears to be low. Thus, based on the low hazard potential of neodecanoate in the aquatic compartment, the low potential to adsorb to soil, a low toxic potential may be assumed for other soil organisms.