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Application of Capillary Electrophoresis to Anion Speciation in Soil Water Extracts

II. Arsenic

^a CSIRO Land and Water and the Cooperative Research Centre for Soil and Land Management, Private Mail Bag No. 2, Glen Osmond, South Australia 5064
^b Soil, Plant and Ecological Sciences Division, P.O. Box 84, Lincoln Univ., Canterbury, New Zealand
^c Dep. of Land and Water, Univ. of Adelaide, Waite Campus, Urrbrae, South Australia 5064
^d Dep. of Crop and Plant Sciences, Univ. of Georgia, Athens, GA 30602 USA
^e Dionex Corporation, 1228 Titan Way, Sunnyvale, CA 94088-3606 USA

View larger version (28K): [in a new window]   Fig. 1 Effect of solution pH on the proportion of acid dissociated based on the acid pKa values

View larger version (17K): [in a new window]   Fig. 2 Effect of runvoltage (a) and column temperature (b) on migration time of arsenic compounds. Separation column, 720-mm by 50-µm i.d. fused capillary tube; support electrolyte chromate buffer 5 mmol L-1 with 0.5 mmol L-1 EOF modifier; [pH 8.13 and ]

View larger version (19K): [in a new window]   Fig. 3 Electropherograms of As species at different pH values using the operating conditions of 25 kV, 30°C (verticle axis in mV). Separation column, 720-mm by 50-µm i.d. fused capillary tube; support electrolyte chromate buffer 5 mmol L-1 with 0.5 mmol L-1 EOF; . Peak "x" was not identified during the analysis

View larger version (18K): [in a new window]   Fig. 4 Effect of pH of buffer solution on mean migration time of As(V) DMA and PO4 with the verticle axis in mV. Separation column, 720-mm by 50-µm i.d. fused capillary tube; support electrolyte chromate buffer 5 mmol L-1 with 0.5 mmol L-1 EOF modifier; applied voltage 20 kV ([As] and

View larger version (22K): [in a new window]   Fig. 5 Typical electropherograms of a soil solution at buffer pH values of 8.13 (a), 9.03 (b), and 10.01 (c). Separation column, 720-mm by 50-µm i.d. fused capillary tube; support electrolyte chromate buffer 5 mmol L-1 with 0.5 mmol L-1 EOF modifier; applied voltage 20 kV, and 20°C. Peaks "x" and "y" were not identified during the analysis

View larger version (31K): [in a new window]   Fig. 6 Relationship between the concentration of As species and peak area. Separation column, 720-mm by 50-µm i.d. fused capillary tube; support electrolyte chromate buffer 5 mmol L-1 with 0.5 mmol L-1 EOF modifier; applied voltage 25 kV and 30°C for As(III) and DMA and 20 kV and 20°C for As(V). pH of electrolyte for the separation of As(III) and ;

View larger version (17K): [in a new window]   Fig. 7 Typical electropherograms of selected soil solutions following spiking of As(V) at 0.16, 2, and 5 mg L-1. Capillary conditions were identical to those developed above. Separation column, 720-mm by 50-µm i.d. fused capillary tube; support electrolyte chromate buffer 5 mmol L-1 with 0.5 mmol L-1 EOF modifier; applied voltage 20 kV and 20°C. pH of electrolyte separation of