Influence of oligomeric silicic and humic acids on aluminum accumulation in a freshwater grazing invertebrate

Faculty Science Year: 2002
Type of Publication: ZU Hosted Pages: 382–387
Authors:
Mahmoud Mahmoud Ahmed Desouqy
Journal: Ecotoxicology and Environmental Safety Ecotoxicology and Environmental Safety Volume: 53
Keywords : Influence , oligomeric silicic , humic acids , aluminum accumulation    
Abstract:
This study examined the influence of oligomeric silicic acid and humic acid on aluminum in the water column and its accumulation in the freshwater snail Lymnaea stagnalis. Forty-eight hours after addition of Al (500 mgL1), 83% of the metal was lost from the water column. This loss was reduced by oligomeric silica (20 mg L1) and by humic acid (10 mg L1). Aluminum accumulated in the digestive gland and, to a lesser extent, in the remaining soft tissues, and this accumulation was reduced by oligomeric silica. In the presence of humic acid, Al accumulation in the digestive gland was unaffected, though less was accumulated in the remaining tissues. Snails accumulated Si preferentially in the digestive gland and this accumulation was increased in the presence of added Al. Thus, both oligomeric silica and humic acid influence Al bioavailability and Si is upregulated in the digestive gland in the presence of Al.
    
     
 
       

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