+ 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

Experimental determination and modeling of arsenic complexation with humic and fulvic acids



Experimental determination and modeling of arsenic complexation with humic and fulvic acids



Journal of Hazardous Materials 279: 569-578



The complexation of humic acid (HA) and fulvic acid (FA) with arsenic (As) in water was studied. Experimental results indicate that arsenic may form complexes with HA and FA with a higher affinity for arsenate than for arsenite. With the presence of iron oxide based adsorbents, binding of arsenic to HA/FA in water was significantly suppressed, probably due to adsorption of As and HA/FA. A two-site ligand binding model, considering only strong and weak site types of binding affinity, was successfully developed to describe the complexation of arsenic on the two natural organic fractions. The model showed that the numbers of weak sites were more than 10 times those of strong sites on both HA and FA for both arsenic species studied. The numbers of both types of binding sites were found to be proportional to the HA concentrations, while the apparent stability constants, defined for describing binding affinity between arsenic and the sites, are independent of the HA concentrations. To the best of our knowledge, this is the first study to characterize the impact of HA concentrations on the applicability of the ligand binding model, and to extrapolate the model to FA. The obtained results may give insights on the complexation of arsenic in HA/FA laden groundwater and on the selection of more effective adsorption-based treatment methods for natural waters.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 053130003

Download citation: RISBibTeXText

PMID: 25108831

DOI: 10.1016/j.jhazmat.2014.07.039


Related references

Complexation and release isotherm of arsenic in arsenic-humic/fulvic equilibrium study. Australian Journal of Soil Research 42(7): 815-824, 2004

Characterization of humus of humic allophane soils in Japan. 1. Humic acids (Ch)/fulvic acids (Cf) ratios. 2. Some physico-chemical properties of humic and fulvic acids. Bull. Kyushu agric. Exp. Sta 10: 185-204, 1964

A unified physicochemical description of the protonation and metal ion complexation equilibria of natural organic acids (humic and fulvic acids). 3. Influence of polyelectrolyte properties and functional heterogeneity on the copper ion binding equilibria in an Armadale Horizons Bh fulvic acid sample. Environmental Science and Technology 20(4): 367-376, 1986

Studies of aluminium complexation to humic and fulvic acids using a method for the determination of quickly reacting aluminium. Water Air & Soil Pollution 84(1-2): 103-116, 1995

A unified physicochemical description of the protonation and metal ion complexation equilibria of natural organic acids (humic and fulvic acids). 2. Influence of polyelectrolyte properties and functional group heterogeneity on the protonation equilibria of fulvic acid. Environmental Science & Technology 20(4): 354-366, 1986

Complexation of 1 naphthol by humic and fulvic acids. Soil Science Society of America Journal 56(1): 67-73, 1992

Complexation of calcium ions by humic and fulvic acids. Analusis 27(5): 428-432, 1999

The chemistry of humic and fulvic acids extracted from argentine soilsII. Permanganate oxidation of methylated humic and fulvic acids. Soil Biology and Biochemistry 5(3): 287-296, 1973

Free energy change during complexation of metals with humic and fulvic acids. Clay Research 7(1&2): 54-56, 1988

Complexation of heavy metals with humic and fulvic acids extracted from farm wastes. Acta Agronomica Ovariensis 36(1/2): 67-74, 1994

Comparison of the complexation of Cu and Cd by humic or fulvic acids and by ligands observed in lake waters. Aquatic Geochemistry 5(4): 313-335, 1999

Cu(II) and Pb(II) complexation by humic and fulvic acids: conditional stability constants and their correlation with humus quality. Humic substances in the global environment and implications on human health: Proceedings of the 6th International Meeting of the International Humic Substances Society, Monopoli Bari, Italy, September 20-25, 1992: 475-480, 1994

Effects of cations on the aqueous complexation of polycyclic aromatic hydrocarbons by humic and fulvic acids. Agronomy Abstracts 1989: 206, 1989

Ion-selective electrode potentiometric studies on the complexation of copper(II) by soil-derived humic and fulvic acids. Analytica Chimica Acta 279(2): 221-233, 1993

Measurement of complexation properties of humic and fulvic acids in natural waters with lead and copper ion-selective electrodes. Analytical Chemistry 49(2): 216-222, 1977