Bacterial bioreporter detection of arsenic associated with iron oxides

Environmental Science. Processes & Impacts
Case M van GenuchtenJasquelin Peña

Abstract

Bacterial bioreporters are engineered microorganisms that have found recent application as a low-cost method of detecting arsenic (As) in environmental systems. However, no assessment exists of bioreporter detection of particle-bound As. We applied an Escherichia coli-based bioreporter to assess the bioavailability of As(v) adsorbed by goethite (α-FeOOH), 2-line ferrihydrite and As(v) co-precipitated with Fe(iii). We found that As(v) bound to the surface of crystalline goethite was not detected by the bioreporters, which contrasted sharply the 50% detection of As(v) adsorbed by ferrihydrite. In addition, the presence of Ca2+ caused a systematic decrease in the bioreporter-detected As(v) fraction in the ferrihydrite samples. For co-precipitated As(v)-Fe(iii) samples, we found a similar bioreporter-detected As(v) fraction (<0.2) regardless of crystallite size (0.7-2.5 nm) or As Fe-1 surface loading (10-60 mol%). Our results reveal that the bioreporter response depends largely on aggregated particle size, which is expected to physically isolate As(v) from bioreporters by encapsulating surface-bound As(v) in coagulated flocs. Our results show that while bioreporters do not perform optimally in water that contains Fe particles, this...Continue Reading

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Citations

Jan 7, 2022·AMB Express·Josué Daniel Mora-GarduñoBernardo Franco

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Methods Mentioned

BETA
biosensors
X-ray

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