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
physicochemical property  LH  HP  GR  MR 1  MR 2
TOC %  2.8 ± 0.5c  1.7d  5.17 ± 0.31e  3.22 ± 0.07e  3.70 ± 0.00e
black carbon %  no data  0.29f  0.365 ± 0.035e  0.640 ± 0.065e  0.616 ± 0.013e
petrographic 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
sediment mass less than 63 μm %  96  19  70  74  76
sediment mass in light sediment fraction %  1.2  4  12.4  7.1  11.6
PCB concentration (μg/kg)  1250  9900  6820  45160  87400
PCB mass in light sediment fraction %  18  68  64.5  40.3  43.5
mass fraction of PCBs associated with Dapp,fast/R2  75  43  76  59  62
mass fraction of PCBs desorbed in 1 month  78  35  91  80  85
a  TOC = 0.83 ± 0.03%; black carbon = 0.258 ± 0.056%; arochlor 1254 PCB concentration = 330 (μg/kg). Data taken from ref (14).
b  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).
c  Data taken from ref (13).
d  Data taken from ref (2).
e  Data taken from ref (14).
f  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 sampled.