Variation of acid volatile sulfide and metals in field-exposed sediments
Conference
·
OSTI ID:460500
- Environmental Protection Agency, Narragansett, RI (United States)
- Science Applications International Corp., Narragansett, RI (United States)
Use of acid volatile sulfides (AVS) to assess metals bioavailability in field sediments is complicated by vertical and temporal variation of AVS. In a field colonization experiment, Narragansett Bay sediments were spiked with cadmium, copper, lead, nickel and zinc at nominal simultaneously extracted metals (SEM:AVS) ratios of 0.1, 0.8 and 3.0, and replaced. Sediment core and interstitial water (IW) samples were collected for AVS, SEM and dissolved metals determinations periodically. After 4 months, faunal assemblages in all treatments were similar to controls. Depth profiles of AVS and SEM were consistent with those observed in natural sediments. In sediments in which SEM exceeded AVS, SEM concentrations decreased in the upper 2--3 centimeters, while no change in SEM was observed in sediments where AVS exceeded SEM. IW metals concentrations reflected relative SEM and AVS concentrations: concentrations were below detection limits in samples where SEM concentrations were less than AVS, whereas in samples where SEM exceeded AVS, significant concentrations of metals were found. Temporal variation was also evident: SEM exceeded AVS in 0.8X sediments for 1--2 months, but after four months, SEM exceeded AVS in only the top centimeter of sediment and no detectable concentrations were found in interstitial waters. Likewise, IW metals concentrations were similar in surface and deeper sediments during the first two months, but after four months were lower in surface than in deeper sediments. Overall, IW concentrations decreased with time throughout the experiment.
- OSTI ID:
- 460500
- Report Number(s):
- CONF-961149--
- Country of Publication:
- United States
- Language:
- English
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