Passive sampling: partition coefficients for a silicone rubber reference phase.
Silicone rubber sheeting can be used as a passive sampling device for hydrophobic organic contaminants in the environment to determine the available concentrations in water and sediments. Reliable sampler-water partition coefficients are required to determine the sampling rates and the dissolved contaminant concentrations in water and in sediment pore water. Log partition coefficients (logK(sr,w)) for silicone rubber-water have been estimated for 32 polycyclic aromatic hydrocarbons (PAHs), 2 deuterated PAH analogues and 32 chlorobiphenyls (CBs) using the cosolvent method, with methanol as cosolvent. Strong linear relationships were found with literature values for the corresponding log octanol-water partition coefficients (logK(ow)) for both CBs and PAHs, confirming that partitioning into the silicone rubber is strongly determined by the hydrophobicity of the compounds, which suggests logK(ow) is a good predictor of logK(sr,w) and that absorption is the main mechanism for accumulation of analytes into the silicone rubber polymer.
Yates
Kyari
K
Fisheries Research Services Marine Laboratory, 375 Victoria Road, Aberdeen, UKAB11 9DB.
Davies
Ian
I
Webster
Lynda
L
Pollard
Pat
P
Lawton
Linda
L
Moffat
Colin
C
D057927:Hydrophobic and Hydrophilic Interactions; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry; D012015:Reference Standards; D012044:Regression Analysis; D012826:Silicone Elastomers / Q000737:chemistry*; D012995:Solubility; D012997:Solvents / Q000737:chemistry*; D014867:Water / Q000737:chemistry
D011084:Polycyclic Aromatic Hydrocarbons; D012826:Silicone Elastomers; D012997:Solvents; D014867:Water