title: [The chemical accident of the Hoechst AG facility 22 February 1993--1. Extent of environmental pollution and clean-up].
abstract: A major industrial chemical accident occurred on 22 February 1993 at Hoechst AG Frankfurt/Germany. Due to a series of errors in operational procedures approximately 11.8 tons of a chemical mixture were emitted, partly resulting in heavy contamination of a nearby housing area. The chemical mixture consisted of about 26% anorganic and 74% organic substances, mostly chlorinated nitroarenes, the most important organic contaminant being o-nitroanisol (about 27% of the total amount). Maximum earth contamination in allotment gardens was up to 8 g o-nitroanisol/m2, in the housing area 547 mg/m2. Maximum air contamination was up to 18 micrograms o-nitroanisol/m3, declining quickly during redevelopment and staying constantly below 2 micrograms/m3 from 2 March 1993 onwards. In 96% of more than 300 indoor air measurements no o-nitroanisol could be detected. Redevelopment measurements were started and completed very quickly: Removal of contaminated earth, recultivation of the gardens, cutting bushes and cutting down coniferous trees, cutting off and renewing street-surfaces, cleaning up footpaths and roofs of the houses. Four weeks after the accident, redevelopment measurements were completed, as confirmed by numerous analyses.
authors.affiliation: Gesundheitsamt der Stadt Frankfurt am Main.
authors.forename: U
authors.initials: U
authors.lastname: Heudorf
authors.forename: M
authors.initials: M
authors.lastname: Peters
mesh_terms: D000059:Accidents; D016902:Air Pollution, Indoor / Q000032:analysis; D002617:Chemical Industry; D004787:Environmental Pollution / Q000032:analysis*; D005858:Germany; D006801:Humans; D008452:Maximum Allowable Concentration; D012307:Risk Factors
vernacular_title: Der Störfall in der Fa. Hoechst AG vom 22.2.1993--1. Ausmass der Umweltbelastung und Sanierungsverlauf.