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Spectroscopic Analysis of Arsenic Uptake in Pteris Ferns

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Author(s): Terrence Slonecker | Barry Haack | Susan Price

Journal: Remote Sensing
ISSN 2072-4292

Volume: 1;
Issue: 4;
Start page: 644;
Date: 2009;
Original page

Keywords: arsenic phytoremediation | Pteris ferns | derivative spectroscopy | partial least squares

ABSTRACT
Two arsenic-accumulating Pteris ferns (Pteris cretica mayii and Pteris multifida), along with a non-accumulating control fern (Nephrolepis exaltata) were grown in greenhouse conditions in clean sand spiked with 0, 20, 50, 100 and 200 ppm sodium arsenate. Spectral data were collected for each of five replicates prior to harvest at 4-week intervals. Fern samples were analyzed for total metals content and Partial Least Squares and Stepwise Linear Regression techniques were used to develop models from the spectral data. Results showed that Pteris cretica mayii and Pteris multifida are confirmed hyperaccumulators of inorganic arsenic and that reasonably accurate predictive models of arsenic concentration can be developed from the first derivative of spectral reflectance of the hyperaccumulating Pteris ferns. Both the arsenic uptake and spectral results indicate that there is some species-specific variability but the results compare favorably with previously published data and additional research is recommended.

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Tangokurs Rapperswil-Jona

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