Concentration-dependent RDX uptake and remediation by crop plants |
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Authors: | Diejun Chen Z Lewis Liu Wanye Banwart |
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Institution: | (1) University of Illinois, Urbana, IL, USA;(2) Present address: National Center for Agricultural Utilization Research, USDA-ARS, 1815 N University St, Peoria, IL 61604, USA |
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Abstract: | The potential RDX contamination of food chain from polluted soil is a significant concern in regards to both human health
and environment. Using a hydroponic system and selected soils spiked with RDX, this study disclosed that four crop plant species
maize (Zea mays), sorghum (Sorghum sudanese), wheat (Triticum aestivum), and soybean (Glycine max) were capable of RDX uptake with more in aerial parts than roots. The accumulation of RDX in the plant tissue is concentration-dependent
up to 21 mg RDX/L solution or 100 mg RDX/kg soil but not proportionally at higher RDX levels from 220 to 903 mg/kg soil. While
wheat plant tissue harbored the highest RDX concentration of 2,800 μg per gram dry biomass, maize was able to remove a maximum
of 3,267 μg RDX from soil per pot by five 4-week plants at 100 mg/kg of soil. Although RDX is toxic to plants, maize, sorghum,
and wheat showed reasonable growth in the presence of the chemical, whereas soybeans were more sensitive to RDX. Results of
this study facilitate assessment of the potential invasion of food chain by RDX-contaminated soils. |
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