Interstitial water sampling method with reduced losses of polynuclear aromatic hydrocarbon compounds and maximum volumes
- Environmental Protection Agency, Newport, OR (United States)
Centrifugation in glass bottles (Corex, 150 ml, 4,000 x g, 90 min) combined with a Teflon/stainless steel aspiration apparatus (cent/asp) provided the highest pore water concentrations of polynuclear aromatic hydrocarbons (PAH) from a spiked, fine-grained sediment. Pore water recovered with the other methods, cent/asp combined with glass fiber (GF) filtration, in situ (7 and 14 days) peeper, and in situ GF-covered fitted glass tube, yielded significantly lower concentrations of acenaphthene, phenanthrene, and fluoranthene from sediment that had been incubated at 10 C for 23 and 30 days following spiking. Compared to the cent/asp concentrations, average differences ({+-}SD) for the other manipulations were {minus}36% {+-} 19%, {minus}72% {+-} 22%, and {minus}69 {+-} 5% for filtering, fitted tub and peeper, respectively. Losses through the use of GF filters were positively correlated to compound Kow, whereas peeper losses were similar among the three compounds, suggesting non-equilibrium conditions. During 18 separate studies in which pore water was collected by cent/as control interstitial water was spiked with up to 16 PAH or four chlorinated hydrocarbon compounds (in various combinations) at concentrations ranging from 0.015 ppb to 200 ppb and sampled using the teflon/stainless steel (TS) apparatus. Average losses ranged from 1% to 15% for individual compounds. Centrifugation at moderate g-forces for 90 min. insures that only dissolved material < 0.5 {micro}m remain above the sediment pellet. Fine-grained sediments from a variety of field locations and contamination levels, when subjected to these conditions have produced clear water above a compact pellet. By using the TS apparatus, maximum volumes of pore water with minimal losses of analytes can be cleanly withdrawn from the centrifuge bottle because the pellet-water interface is easily seen with back-lighting, and the rigid, fine-tipped Teflon tubing can be precisely controlled.
- OSTI ID:
- 398195
- Report Number(s):
- CONF-9511137-; ISBN 1-880611-03-1; TRN: IM9649%%403
- Resource Relation:
- Conference: 2. Society of Environmental Toxicology and Chemistry (SETAC) world conference, Vancouver (Canada), 5-9 Nov 1995; Other Information: PBD: 1995; Related Information: Is Part Of Second SETAC world congress (16. annual meeting): Abstract book. Global environmental protection: Science, politics, and common sense; PB: 378 p.
- Country of Publication:
- United States
- Language:
- English
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