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Evaluation of an Acid Ammonium Oxalate Extraction to Determine Fluoride Resident Concentrations in Soils

Louis Bégin and Josée Fortin*

Département des Sols et de Génie Agroalimentaire, FSAA, Université Laval, Québec, QC, Canada, G1K 7P4



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  		Fig. 1. Column experiment setup.

 


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  		Fig. 2. Example of chromatogram obtained for fluoride analysis by ion chromatography, showing the fluoride peak at t = 3.55 min for [F-] = 43.8 µg L-1. The dashed line corresponds to the baseline. Conductivity was offset to 0 µS at t = 0.0 min.

 


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  		Fig. 3. Recovery of added fluoride with acid ammonium oxalate extraction (Fox). The dashed line is the 1:1 line and represents a recovery of 100%.

 


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  		Fig. 4. Total fluoride (diamonds) and oxalate-extractable fluoride (circles) profiles of the soil core sampled near Column 1.

 


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  		Fig. 5. Final oxalate-extractable fluoride (Fox) and total fluoride (Ftot) resident concentration profiles (a, b) and net Fox and Ftot accumulation profiles (c, d) after fluoride leaching in Column 1.

 


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  		Fig. 6. Final oxalate-extractable fluoride (Fox) and total fluoride (Ftot) resident concentration profiles (a, b) and net Fox and Ftot accumulation profiles (c, d) after fluoride leaching in Column 2.

 




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