title: Identification of Marbon in the Indiana Harbor and Ship Canal.
abstract: Marbon is isomeric with Dechlorane Plus (DP). Both are produced by the Diels-Alder condensation of hexachlorocyclopentadiene with cyclic dienes, and both have elemental compositions of C18H12Cl12. Dechlorane Plus is commonly found in the environment throughout the world, but Marbon has, so far, only been detected at low levels in one sediment core collected near the mouth of the Niagara River in Lake Ontario. Here we report on the concentrations of Marbon and anti-DP in 59 water samples from five Lake Michigan tributaries [the Grand, Kalamazoo, St. Joseph, and Lower Fox Rivers, and the Indiana Harbor and Ship Canal (IHSC)], 10 surface sediment samples from the IHSC, and 2 surface sediment samples from the Chicago Sanitary and Ship Canal. Three Marbon diastereomers were detected in the water and sediment samples from the IHSC, which is far from the location of its previous detection in Lake Ontario. The sum of the concentrations of the three Marbons was greater in the water from the IHSC (N = 11, median =150 pg/L) compared to those in water from the other four tributaries (N = 11-13, medians =0.9-2.0 pg/L). Marbon concentrations in sediment samples from the IHSC were up to 450 ng/g dry weight. Anti-DP was also measured for comparison. Its concentrations were not significantly different among the water samples, but its sediment concentrations in the IHSC were significantly correlated with those of Marbon. The source of Marbon contamination in the IHSC is not clear.
authors.affiliation: School of Public and Environmental Affairs, Indiana University , Bloomington, Indiana 47405, United States.
authors.forename: Jiehong
authors.initials: J
authors.lastname: Guo
authors.affiliation: School of Public and Environmental Affairs, Indiana University , Bloomington, Indiana 47405, United States.
authors.forename: Marta
authors.initials: M
authors.lastname: Venier
authors.affiliation: School of Public and Environmental Affairs, Indiana University , Bloomington, Indiana 47405, United States.
authors.forename: Kevin
authors.initials: K
authors.lastname: Romanak
authors.affiliation: United States Geological Survey, Wisconsin Water Science Center , Middleton, Wisconsin 53562, United States.
authors.forename: Stephen
authors.initials: S
authors.lastname: Westenbroek
authors.affiliation: School of Public and Environmental Affairs, Indiana University , Bloomington, Indiana 47405, United States.
authors.forename: Ronald A
authors.identifier: 0000-0003-0975-5058
authors.initials: RA
authors.lastname: Hites
mesh_terms: D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D007196:Indiana; D045483:Rivers; D012767:Ships; D014874:Water Pollutants, Chemical
chemical_list: D014874:Water Pollutants, Chemical