engleski

The adsorption and interaction of long-chain fatty acids and heavy metals at the mercury electrode / sodium chloride solution interface

The reduction of heavy metals (cadmium, lead and zinc) in the presence of long-chain fatty acids (lauric, oleic and linoleic) in 0.55 mol dm-3 NaCl and 0.03 mol dm-3 NaHCO3 at pH 8.7 has been studied by differential pulse polarography. The increase of the peak height of investigated metals by up to tenfold the value obtained in electrolyte without fatty acids is due to adsorption of metal ions at the electrode surface. The accumulation of metal increases with the increase of adsorption time and with increase of salinity. The heavy metal adsorption depends on the concentration of both metal ions and fatty acids.The interaction of heavy metals with the unsaturated fatty acids in the bulk and/or in the adsorbed layer at different natural interfaces could be of considerable importance in an understanding of the fate and distribution of heavy metals in the natural aquatic environment.

heavy metals ; long-chain fatty acids ; mercury electrode ; differential pulse polarography

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