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Arsenic reactions and brake fern (Pteris vittata L.) uptake in tropical soils

Author

Listed:
  • Hue Van NGUYEN
  • Amjad AHMAD

    (Department of Tropical Plant and Soil Sciences, University of Hawaii at Manoa, Honolulu, USA)

Abstract

In Hawaii, past use of arsenical pesticides has left elevated levels of arsenic (As) in some soils. Sorption isotherms of an Andosol and an Acrisol showed that the former required 1100 mg/kg, and the latter 300 mg/kg of added As to maintain 0.20 mg As/L in solution, the maximum allowable As level in streams/rivers in Hawaii. Greenhouse experiments were conducted on an Andosol (315 mg/kg total As), which was amended with 0, 5 g/kg compost, 5 g Fe/kg as amorphous Fe(OH)3, or 250 mg P/kg as Ca(H2PO4)2, and on a low-As (15 mg/kg) Acrisol, which was spiked with 0, 150 or 300 mg As/kg as Na2HAsO4.7 H2O. Brake fern (Pteris vittata L.) was used as the test plant. Arsenic concentration in the fern fronds averaged 355 mg/kg in the Andosol, and 2610 and 1270 mg/kg (from consecutive plantings, 2 and 12 months after As addition, respectively) in the Acrisol spiked with 300 mg/kg of As. Chemical reactions, as suggested by sequential extractions, likely controlled the availability and uptake of soil As. Mehlich-3 extraction could be used to identify As-contaminated soils and potential phytoremediation as it correlated well with bioaccessible As and with As in fern fronds.

Suggested Citation

  • Hue Van NGUYEN & Amjad AHMAD, 2017. "Arsenic reactions and brake fern (Pteris vittata L.) uptake in tropical soils," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 63(2), pages 55-61.
    • Handle: RePEc:caa:jnlpse:v:63:y:2017:i:2:id:428-2016-pse
    DOI: 10.17221/428/2016-PSE
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    References listed on IDEAS

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    1. P. Tlustoš & J. Száková & J. Hrubý & I. Hartman & J. Najmanová & J. Nedělník & D. Pavlíková & M. Batysta, 2006. "Removal of As, Cd, Pb, and Zn from contaminated soil by high biomass producing plants," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 52(9), pages 413-423.
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