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Determination of zinc in seawater using flow injection analysis with fluorometric detection
Title
Determination of zinc in seawater using flow injection analysis with fluorometric detection,
Description
A sensitive technique for the shipboard determination of zinc in seawater has been developed. The technique couples flow injection analysis with fluorometric detection (FIA-FL). A cation exchange column was used to separate zinc from interfering alkali and alkaline earth ions and to concentrate Zn from seawater. The organic indicator ligand, p-tosyl-8-aminoquinoline, was used to form a complex with zinc, the fluorescence of which was determined with a flow-through fluorometer. The detection limit (defined as three times the standard deviation of the blank, n = 4) was 0.1 nM for a 4.4-mL sample. The precision based on the replicate analysis of samples containing 4.3 nM Zn was ±6% (n = 5). A single sample can be analyzed in 6 min. The technique was determined to be accurate on the basis of analysis of the standard seawater solutions CASS-2 and N ASS-2 and by comparison with previous reliable investigations. A typical profile of 12 samples along with standards and blanks can be completed in triplicate in 5.5 h., Cited By (since 1996):31, CODEN: ANCHA, ,
Author
Nowicki, Johnson, Coale, Elrod, Lieberman
Date
1994-01-01T00:00:00Z
Manganese flux from continental margin sediments in a transect through the oxygen minimum
Title
Manganese flux from continental margin sediments in a transect through the oxygen minimum,
Description
The flux of manganese from continental margin sediments to the ocean was measured with a free-vehicle, benthic flux chamber in a transect across the continental shelf and upper slope of the California margin. The highest fluxes were observed on the shallow continental shelf. Manganese flux decreased linearly with bottom water oxygen concentration, and the lowest fluxes occurred in the oxygen minimum zone (at a depth of 600 to 1000 meters). Although the flux of manganese from continental shelf sediments can account for the elevated concentrations observed in shallow, coastal waters, the flux from sediments that intersect the oxygen minimum cannot produce the subsurface concentration maximum of dissolved manganese that is observed in the Pacific Ocean., Cited By (since 1996):47, Oceanography, CODEN: SCIEA, ,
Author
Johnson, Berelson, Coale, Coley, Elrod, Fairey, Iams, Kilgore, Nowicki
Date
1992-01-01T00:00:00Z