title: Biodegradation and aquatic toxicity of beta-alaninediacetic acid (beta-ADA).
abstract: The aquatic toxicity and biodegradability of the new chelating agent beta-alaninediacetic acid (beta-ADA) were investigated. There is no inhibition effect of beta-ADA in the daphnia magna 24 h test up to a concentration of 1000 mg/L. The algal growth inhibition test resulted in an EC 50 of 19.7 mg/L. An EC 20 of 740 mg/L was determined in the luminescent bacteria test. An EC 50 was not obtained in this test up to a concentration of 2000 mg/L beta-ADA. The degree of biodegradation of beta-ADA was determined in a static and a continuous test. The beta-ADA removal reached 98% at the end of the test after eight weeks in the continuous test which was carried out with laboratory activated sludge units simulating a waste water treatment plant. Further, biodegradation and toxicity tests were coupled, i.e. the effluents of the laboratory activated sludge units were applied in the toxicity tests. A higher toxicity of the effluents of the test units in comparison with the control unit was not observed.
authors.affiliation: Bavarian State Bureau for Water Resources Management, Institute for Water Research, Munich, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Nitschke
authors.forename: A
authors.initials: A
authors.lastname: Wilk
authors.forename: C
authors.initials: C
authors.lastname: Cammerer
authors.forename: G
authors.initials: G
authors.lastname: Lind
authors.forename: G
authors.initials: G
authors.lastname: Metzner
mesh_terms: D019342:Acetic Acid / Q000737:chemistry / Q000633:toxicity*; D000818:Animals; D001419:Bacteria; D001673:Biodegradation, Environmental; D002614:Chelating Agents / Q000633:toxicity*; D003621:Daphnia / Q000187:drug effects; D056890:Eukaryota / Q000187:drug effects; D008163:Luminescent Measurements; D012722:Sewage / Q000737:chemistry / Q000382:microbiology; D018675:Toxicity Tests; D018505:Waste Management / Q000379:methods; D014874:Water Pollutants, Chemical / Q000633:toxicity*; D015091:beta-Alanine / Q000737:chemistry / Q000633:toxicity*
chemical_list: D002614:Chelating Agents; D012722:Sewage; D014874:Water Pollutants, Chemical; C112024:alaninediacetic acid; D015091:beta-Alanine; D019342:Acetic Acid