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Fractionation of Arsenic in Soil by a Continuous-Flow Sequential Extraction Method

^a Dep. of Chemistry, Mahidol Univ., Rama VI Road, Bangkok 10400, Thailand
^b Centre for Soil and Environmental Quality, Soil and Physical Sciences Group, P.O. Box 84, Lincoln Univ., Canterbury, New Zealand

View larger version (24K): [in a new window]   Fig. 1. The continuous-flow extraction system.

View larger version (15K): [in a new window]   Fig. 2. Continuous-flow As extractogram for standard reference material (SRM) 2711 (solid line). Elapsed time shown as dotted line; subfraction volume = 30 mL.

View larger version (36K): [in a new window]   Fig. 3. Comparison of As fraction distribution in certified reference materials (CRMs) as determined by batch and continuous-flow techniques.

View larger version (49K): [in a new window]   Fig. 4. Comparison of As fraction distribution in soils from Ronphiboon, Thailand as determined by batch and continuous-flow techniques.

View larger version (44K): [in a new window]   Fig. 5. Comparison of As fraction distribution in soils from cattle dip sites in Australia as determined by batch and continuous-flow techniques.

View larger version (29K): [in a new window]   Fig. 6. Extractograms for As, Ca, Fe, and Al for Lindendale (20–40 cm) and Benaud (0–10 cm) cattle dip soils, and soil from a tin-mining factory.