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Arsenic Remobilization in a Shallow Lake

The Role of Sediment Resuspension

Centre for Water Research, Univ. of Western Australia, 35 Stirling Hwy., Crawley, Australia, 6009

View larger version (68K): [in a new window]   Fig. 1. The partitioning of arsenic between different operationally defined phases in Lake Yangebup sediment. Average of three replicates, errors represent the standard deviation.

View larger version (18K): [in a new window]   Fig. 2. Changes in pH and dissolved arsenic over time in a sediment–water slurry. Slurry pH reached a steady state within 30 min; dissolved arsenic reached a steady state after approximately 20 h. The solid line indicates the remobilization expected from Step I of the fractionation scheme. Each point represents the average of three samples. The error bars represent the 95% confidence interval. The average starting pH was 6.3.

View larger version (30K): [in a new window]   Fig. 3. (A) The pH response of sediment samples equilibrated with solutions of varying pHinit after 1, 8, and 21 d. (B) Released As and Fe in sediment samples equilibrated with solutions of varying pHinit for 21 d. Each As measurement is the average of three samples; Fe measurements are from single samples. The error bars represent the 95% confidence interval.

View larger version (25K): [in a new window]   Fig. 4. (A) The effect of equilibration time on sediment arsenic partitioning. Comparison is made between initial sediment partitioning and partitioning in sediment shaken for 24 h. (B) Iron concentrations of selected fractions before and after resuspension. Initial partitioning was determined using the average of results from three soil samples, partitioning in resuspended sediment is from the average of two. The error bars represent the standard deviation.

View larger version (14K): [in a new window]   Fig. 5. Changes in arsenic partitioning due to equilibration with solutions of varying pHinit. Arsenic concentrations are expressed as the percentage of total arsenic extracted. The seven sediment phases are grouped into three separate graphs according to magnitude. Each point represents the average of two samples. The error bars represent the standard deviation.