SS4.06 Speciation, Bioavailability, and Impacts of Atmospheric Trace Metals in Aquatic Systems
Date: Wednesday, June 12, 2002
Location: Poster Session - VCC
ZhuangY, Rutgers University, New Brunswick, NJ08854, USA,
Reinfelder, J, R, Rutgers University, New Brunswick, NJ08854, USA,
Metals in rain may be present as bound forms (particulate, organic complexes), but their bioavailability to coastal marine organisms following rain events is largely unknown. Typical rain events for the eastern U.S. (2 cm rain depth) have the potential to significantly impact the total and bioavailable (inorganic) pools of Cu in coastal surface waters. To examine the bioavailability of Cu in rain, short and long term uptake studies were conducted with natural and cultured phytoplankton exposed to New Jersey rain in natural coastal seawater. Enhanced Cu accumulation was observed in Raritan Bay, New Jersey phytoplankton (largely diatoms) incubated with rainwater collected adjacent to the New York-New Jersey Harbor Estuary. The results of short-term uptake studies with 67Cu-equilibrated rainwater show that Cu in rain is bioavailable to marine diatoms and that gross accumulation occurs over a similar time-scale as the accumulation of seawater-equilibrated Cu. The injection of Cu into estuarine and coastal surface waters following rain events may be a source of episodic metal stress to resident planktonic organisms.