University of Illinois, Urbana, IL, USA.
Environ Sci Pollut Res Int. 2011 Jul;18(6):908-17. doi: 10.1007/s11356-011-0449-9. Epub 2011 Jan 28.
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.
土壤中污染的 RDX 对食物链潜在的污染，无论是对人类健康还是对环境来说，都是一个重大的关注点。本研究采用水培系统和添加 RDX 的选定土壤，表明四种作物（玉米、高粱、小麦和大豆）能够吸收 RDX，且在地上部分的吸收量大于根部。在 21mg RDX/L 溶液或 100mg RDX/kg 土壤的浓度范围内，RDX 在植物组织中的积累呈浓度依赖性，但在 220 至 903mg/kg 土壤的更高 RDX 水平下，积累量并非呈比例增加。尽管小麦植物组织中 RDX 的浓度最高，每克干生物量为 2800μg，但在 100mg/kg 土壤下，每盆 5 株经过 4 周的生长，玉米最多可从土壤中去除 3267μg 的 RDX。尽管 RDX 对植物有毒，但玉米、高粱和小麦在接触这种化学物质时表现出了相当的生长能力，而大豆对 RDX 则更为敏感。本研究的结果有助于评估受 RDX 污染土壤对食物链潜在的入侵风险。
