HPLC inorganic arsenic speciation analysis of samples containing high sulfuric acid and iron levels

Gonzalez-Contreras, P.A.; Gerrits, I.P.A.M.; Weijma, Jan; Buisman, C.J.N.

doi:10.1080/02772248.2010.540245

Cited by 8 publications

(2 citation statements)

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“…Arsenate (As 5+ ) was only added to the experiments, but in any case both species (As 3+ and As 5+ ) were controlled in all arsenic measurements. Arsenic speciation in aqueous phase was measured by anionic ion exclusion chromatography using sulfuric acid as mobile phase, followed by UV detection …”

Section: Methodsmentioning

confidence: 99%

“…Arsenic speciation in aqueous phase was measured by anionic ion exclusion chromatography using sulfuric acid as mobile phase, followed by UV detection. 19 Arsenic Solid Stability Analysis by the Toxicity Characteristic Leaching Procedure (TCLP). An enhanced TCLP test was performed in serum bottles that were stirred in a shaker at 20 °C following the EPA procedure.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Bioscorodite Crystallization in an Airlift Reactor for Arsenic Removal

Gonzalez-Contreras

Weijma

Buisman

2012

Crystal Growth & Design

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Bioscorodite (FeAsO 4 •2H 2 O) crystals were crystallized in an airlift reactor fed at pH 1.2 and 72 °C. Arsenic removal was limited by the biological ferrous iron oxidation. In continuous operation, the iron oxidation initially was 30% and increased to 80% in few days when the iron and dissolved oxygen concentration were increased. The bioscorodite yield was 3 g/g of arsenic removed. The first precipitates were identified as scorodite having a dipyramidal octahedron habit with an Fe/As molar ratio of 1.55. The stability test (TCLP) classified the crystals as suitable for storage with a leached arsenic concentration of 0.5 mg L −1 after 60 days. Settling rates of bioscorodite crystals between 50 and 140 m h −1 were measured. Size distribution frequency indicates that bioscorodite crystals grew from an average size of 30 μm during batch operation to 160 μm at the end of the continuous operation phase. The morphology and size of the crystals guarantee their freeflowing nature, avoiding scaling. The biggest and most stable crystals can be harvested by sedimentation, to select the material best suited for final disposal.

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Section: Methodsmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%