Effects of various competing ligands on the kinetics of trace metal complexes of Laurentian Fulvic Acid in model solutions and natural waters

2009 ◽  
Vol 636 (1) ◽  
pp. 6-12 ◽  
Author(s):  
Tahir Yapici ◽  
Ismail I. Fasfous ◽  
Jiujiang Zhao ◽  
Chuni L. Chakrabarti
Keyword(s):  
Trace Metal ◽  
Metal Complexes ◽  
Fulvic Acid ◽  
Natural Waters ◽  
Model Solutions ◽  
Kinetics Of

Complexation of Lead in Model Solutions of Humic Acid: Heterogeneity and Effects of Competition with Copper, Nickel, and Zinc

2006 ◽  
Vol 3 (4) ◽  
pp. 276 ◽  
Author(s):  
Ismail I. Fasfous ◽  
C. L. Chakrabarti ◽  
John Murimboh ◽  
Tahir Yapici
Keyword(s):  
Humic Acid ◽  
Trace Metals ◽  
Trace Metal ◽  
Humic Substances ◽  
Metal Concentration ◽  
Natural Waters ◽  
Metal Bioavailability ◽  
Copper Nickel ◽  
Model Solutions ◽  
Equilibrium Function

Environmental Context. Metal bioavailability and toxicity are often related to free metal concentration rather than total metal concentration. Humic substances are chemically and physically heterogeneous complexants for metals in natural waters, and play an important role in trace metal transport, fate, and bioavailability. Metal bioavailability, which depends on chemical speciation of metals, is greatly influenced by the presence of other trace metals and major cations in natural waters. In this work, the effects of heterogeneity of humic substances, and of competition of trace metals on lead speciation in model solutions have been studied to gain a better understanding of these effects on complexation of trace metal lead and its bioavailability. Abstract. Physicochemical heterogeneity of a well characterized humic acid (HA) in its complexation with a trace metal lead in model solutions was investigated using pseudo-polarography at a stationary mercury drop electrode, and the differential equilibrium function (DEF) of Pb(ii)–HA complexes was determined. The complexation of Pb(ii) by HA was determined by taking into account the dependence of the strength of the binding on the metal (Pb) loading. Also investigated were the effects of competition of the trace metals copper, nickel, and zinc on the DEF of Pb(ii)–HA complexes in model solutions. The results showed that these trace metals competed with trace metal lead for binding by HA even when present at the same concentrations as that of lead.

scholarly journals Determination of Trace Metal Complexes by Natural Organic and Inorganic Ligands in Coastal Seawater

2003 ◽  
Vol 19 (4) ◽  
pp. 529-535 ◽  
Author(s):  
Ghiasse ABBASSE ◽  
Baghdad OUDDANE ◽  
Jean Claude FISCHER
Keyword(s):  
Trace Metal ◽  
Metal Complexes ◽  
Coastal Seawater ◽  
Inorganic Ligands

Complexation of Dissolved Organic Matter with Trace Metal Ions in Natural Waters

2012 ◽  
pp. 769-849 ◽  
Author(s):  
Khan M. G. Mostofa ◽  
Cong-qiang Liu ◽  
Xinbin Feng ◽  
Takahito Yoshioka ◽  
Davide Vione ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Trace Metal ◽  
Metal Ions ◽  
Natural Waters ◽  
Trace Metal Ions
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