+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Complexation of trace metals by dissolved organic carbon (DOC) in river systems; comparing ion selective electrodes (ISE) with differential pulse anodic stripping voltammetry (DPASV)



Complexation of trace metals by dissolved organic carbon (DOC) in river systems; comparing ion selective electrodes (ISE) with differential pulse anodic stripping voltammetry (DPASV)



Abstracts with Programs - Geological Society of America 29(6): 248



In natural systems, the formation of complexes, between trace metals and organic, is an important factor influencing transport, fate, bioavailability, and toxicity of metals. Several methods have been used to quantify the capacity and binding strengths of the metal-organic complexes occurring in rivers. DPASV has the sensitivity to measure complexes at real world concentrations, but it is not as species specific as less sensitive methods like ISE. To substantiate the use of DPASV, a comparison study (using ISE and DPASV) was conducted to determine the complexation capacity and binding strength of isolated Swannee River fulvic acid. Cu-fulvic acid complexation was examined with both DPASV (thin Hg film rotating disk electrode) and ISE. Experiments were run at pH 5.5 and 7.5 to bracket natural conditions. In addition, to evaluate competition by alkaline earth metals, synthetic river water was generated using both Ca++ and Mg++. Concentrations and pH were adjusted to levels observed in two Connecticut rivers in order to compare laboratory and field measurements Results indicate that DPASV and ISE give similar estimates of complexation capacities and binding strengths. At lower pH, DPASV tends to underestimate the concentration of the weakly binding ligand class. This may be due to a combination of its detection threshold and the lower concentrations of Cu++ added during DPASV titrations. However, for both methods, the alkaline earth metals decreased complexation capacities, while increasing the measure binding strengths. This is probably due to displacement of the weakly bound Cu++. However, the measure binding strengths and complexation capacities of the synthetic river samples were lower than the values measured in their natural river counter parts. This indicates that while pH, fulvic acid and alkaline earth metals have a major influence on metal-organic complexation, other ligands, such as, synthetic organics and sulfides, are important factors governing trace metal complexation in natural river systems.

Accession: 018597009

Download citation: RISBibTeXText


Related references

Trace-element determination of platinium by differential pulse anodic stripping voltammetry (DPASV) using the glassy carbon electrode. Fresenius' Zeitschrift fuer Analytische Chemie 320(2): 152-155, 1985

Optimization of square wave anodic stripping voltammetry (SWASV) for the simultaneous determination of Cd, Pb, and Cu in seawater and comparison with differential pulse anodic stripping voltammetry (DPASV). Annali di Chimica 92(3): 313-326, 2002

Complexation Study of Humic Acids Extracted from Forest and Sahara Soils with Zinc (II) and Cadmium (II) by Differential Pulse Anodic Stripping Voltammetry (DPASV) and Conductimetric Methods. Water, Air and Soil Pollution 216(1-4): 679-691, 2011

Implementation of a differential pulse anodic stripping voltammetry (DPASV) at a hanging mercury drop electrode (HMDE) procedure for the analysis of airborne heavy metals. Analytical Letters 34(13): 2349-2360, 2001

Direct determination of trace and sub trace metals in natural waters by differential pulse anodic stripping voltammetry use of long lasting sessile drop mercury electrodes compared to commercial hanging drop mercury electrodes kemula type. Analytical Letters 15(19): 1565-1584, 1982

The determination of zinc content in wines by differential pulse anodic stripping voltammetry (DPASV). Czech Journal of Food Sciences 17(2): 73-76, 1999

Determination of Cd, Cu, Pb and Zn content of infant formulas by differential pulse anodic stripping voltammetry (DPASV). Nahrung 38(4): 386-392, 1994

Application of Graphite-Epoxy Composite Electrodes in Differential Pulse Anodic Stripping Voltammetry of Heavy Metals. Microchimica Acta 147(4): 245-251, 2004

Preconcentration of trace metals in sea water matrix for differential pulse anodic stripping voltammetry. Analytica Chimica Acta 287(3): 259-266, 1994

Simultaneous determination of the toxic trace metals Cd, Cu, Pb and Zn in soils by differential pulse anodic stripping voltammetry. Fresenius Zeitschrift fur Analytische Chemie 313(5): 390-394, 1982

Evaluation of differential-pulse anodic stripping voltammetry at mercury-coated carbon fiber electrodes. Comparison to analogous measurements at rotating disk electrodes. Analytical Chemistry 59(17): 2119-2122, 1987

Simultaneous determination of trace metals in industrial and domestic effluents by differential pulse anodic stripping voltammetry. Journal of Environmental Science and Health . Part A: Environmental Science and Engineering 12(10): 531-547, 1977

Low level determination of trace metals in Arctic sea water and snow by differential pulse anodic stripping voltammetry. NATO Conference Series IV, 1983

Simultaneous determination of trace metals inindustrial and domestic effluents by differential pulse anodic stripping voltammetry. Journal of environmental science and health Part A Environmental science and engineering: 31-547, 1977

Toxic trace metals in food. II. A comparative study of the levels of toxic trace metals in wine by differential pulse anodic stripping voltammetry and electrothermal atomic absorption spectrometry. Zeitschrift für Lebensmittel-Untersuchung und -Forschung 168(6): 439-443, 1979