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Development of a liquid membrane technique to measure the temporal variation in “bioavailable” copper and nickel in the South San Francisco Bay
Kenneth Bruland, University of California, Santa Cruz
Technical Completion Report W-958
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ABSTRACT: A supported liquid membrane (SLM) technique for the determination of free and
labile copper in estuarine and coastal water was developed. The SLM consisted of
10 mM Lasalocid, a naturally occurring carboxylic polyether ionophore, dissolved
in o-nitrophenyl octyl ether (NPOE), immobilized on a thin microporous solid
membrane. The solid membrane was sandwiched between two aqueous phases:
(1) a source or sample solution containing the analyte (in this case free/labile
copper) to be extracted and (2) a strip or acceptor solution into which the
analyte(s) is trapped. The membrane support was clamped between two circular
Teflon blocks each with circular groves like an Archimedes spiral.
The SLM was used to extract free and labile copper from water samples collected
from two sampling stations, Dumbarton Bridge and San Bruno Shoals in South
San Francisco Bay The copper concentration in the SLM extracts was determined
off-line by GFAAS.
Between 90-97% of the total dissolved copper was bound to organic ligands, and
therefore not “bioavailable” to phytoplankton. Thus only about 5-10% of the total
dissolved copper existed as inorganic and/or labile organic copper species. The
measurements were consistent with earlier copper speciation measurements that
were made in South San Francisco Bay using electrochemical methods.
SUGGESTED CITATION:
Kenneth Bruland,
"Development of a liquid membrane technique to measure the temporal variation in “bioavailable” copper and nickel in the South San Francisco Bay"
(September 1, 2003).
University of California Water Resources Center.
Technical Completion Reports.
Paper bruland.
http://repositories.cdlib.org/wrc/tcr/bruland
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