PMC:2854002 / 5558-7364 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/2854002","sourcedb":"PMC","sourceid":"2854002","source_url":"https://www.ncbi.nlm.nih.gov/pmc/2854002","text":"Table 1 Sediment Physicochemical Properties for Lake Hartwell (LH), Hunters Point (HP), Grasse River (GR), Milwaukee River Location 1 (MR 1), Milwaukee River Location 2 (MR 2), Niagara River (NR)a, and Crab Orchard Lakeb Sediments Contaminated with PCBs\nphysicochemical property LH HP GR MR 1 MR 2\nTOC % 2.8 ± 0.5c 1.7d 5.17 ± 0.31e 3.22 ± 0.07e 3.70 ± 0.00e\nblack carbon % no data 0.29f 0.365 ± 0.035e 0.640 ± 0.065e 0.616 ± 0.013e\npetrographic information or microscopy observation a very small amount of fine coal like fragments presence of charcoal, coal and coke particles mostly vegetative debris presence of some coal-derived particles presence of some coal-derived particles\nsediment mass less than 63 μm % 96 19 70 74 76\nsediment mass in light sediment fraction % 1.2 4 12.4 7.1 11.6\nPCB concentration (μg/kg) 1250 9900 6820 45160 87400\nPCB mass in light sediment fraction % 18 68 64.5 40.3 43.5\nmass fraction of PCBs associated with Dapp,fast/R2 75 43 76 59 62\nmass fraction of PCBs desorbed in 1 month 78 35 91 80 85\na TOC = 0.83 ± 0.03%; black carbon = 0.258 ± 0.056%; arochlor 1254 PCB concentration = 330 (μg/kg). Data taken from ref (14).\nb Crab Orchard Lake sediment: TOC = 0.59%; the sediment comprised 16% clay, 70% silt, 14% sand; arochlor 1254 PCB concentration = 29153 (μg/kg); PCB congener mass fractions desorbed within 14 days ranged from 40 to 80%; black carbon % was not determined. Data taken from ref (12).\nc Data taken from ref (13).\nd Data taken from ref (2).\ne Data taken from ref (14).\nf Black carbon was taken as 29% of TOC which was estimated based on the average BC/TOC ratio for 6 samples described by Cho et al. (18) taken from an adjacent location in the same mudflat where the original HP sediment was 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