Aquatic toxicity of mono- and diesters of o-phthalic acid
(English)Manuscript (preprint) (Other academic)
The degradation of phthalic acid diesters may lead to formation of a-phthalic acid and phthalic acid monoesters. The ecotoxic properties of the monoesters have never been systematically investigated and concern has been raised that these degradation products may be more toxic than the diesters. Therefore, the aquatic toxicity of phthalic acid, 6 monoesters, and 5 diesters of a-phthalic acid was tested in three standardized toxicity tests using the bacteria Vibrio fischeri, the green algae Pseudokirchneriella subcapitata, and the crustacean Daphnia magna. The monoesters tested were monomethyl-, monoethyl-, monobutyl-, monobenzyl-, mono(2-ethylhexyl)-and monodecyl phthalate; while the diesters tested were dimethyl-, diethyl-, dibutyl-, butylbenzyl-, and di(2-ethylhexyl) phthalate. The compounds were tested in concentrations below the water solubility and concentrations were confirmed by chemical analyses. The EC50-values for the three organisms ranged from 103 mg/L to >4710 mg/L for phthalic acid, and corresponding values for the monoesters ranged from 2.3 mg/L (monodecyl phthalate in bacteria test) to 4130 mg!L (monomethyl phtalate in bacteria test). Dhnethyl- and diethyl- phthalate were found to be the least toxic of the diesters (EC50 from 26.2-377 mg/L) and the toxicity of the other diesters (butylbenzyland dibutyl phthalate) ranged from 0.96 mg/L to 7.74 mg/L. In general, the phthalate monoesters (degradation products) were less toxic than the corresponding diesters (mother compounds).
Phthalates, phthalic acid monoesters, Daphnia magna, Pseudokirclmeriella subcapitata, Vibrio fischeri
Social Sciences Interdisciplinary
IdentifiersURN: urn:nbn:se:liu:diva-80184OAI: oai:DiVA.org:liu-80184DiVA: diva2:546080