Polyaromatic Hydrocarbons in Rhizosphere Soil of Different Plants: Effect of Soil Properties, Plant Species, and Intensity of Anthropogenic Pressure

Abstract

The objective of the present study was to determine the content of polycyclic aromatic hydrocarbons (PAH) in the rhizospheres of some selected plant species (Cucumis dativus, Daucus carota, Allium cepa, Cueurbita, Petroselinum sativum, Cucurbitaceae, Phaseolus vulgaris, Beta vulgaris, Apium graveolens, Allium porrum, Vicia faba). Various anthropogenic influences on the PAH content in the rhizospheres of the three species selected were also studied. The PAH content was determined using the high performance liquid chromatography (HPLC) method with ultraviolet (UV) detection after a preliminary sample treatment with ultrasonic techniques. On the basis of the PAH content, the organic carbon content and the value of log K oc , a potentially bioavailable PAH fraction present in the rhizospheres of the plants studied, were calculated.The lowest content of the PAH sum (,1100 mg/kg) was found in the Petroselinum sativum, Cucurbitaceae, and Allium porrum rhizospheres. The content of the compounds studied was more than 67% lower than in the control soil (3307 mg/kg). Moreover, in the rhizosphere of the Allium porrum, the lowest content of all the five-and six-ring PAH samples studied was found. The contribution of the 16 PAHs' sum, determined on the basis of an equilibrium partition in all rhizospheres studied, was higher than in the control soil. The evaluation of the PAH content in the rhizospheres of the three plants as related to the influence of anthropogenic sources showed a higher PAH content in them than

Kinetics of Pahs Losses and Relationships Between Pahs Properties and Properties of Soil in Sewage Sludge-Amended Soil

“…Liste and Alexander (37) showed that rhizosphere of different plants is characterized by differentiate ability to PAHs degradation. This has also been confirmed by other authors (38,39). In the study presented, a perennial plant (willow) and annual plants were applied.…”

Root Exudate Enhanced Contaminant Desorption: An Abiotic Contribution to the Rhizosphere Effect

“…7,8 Because of the complex symbiotic relationships between plant roots and their associated bacteria and mycorrhizal fungi, combined with the inherent physical difficulty involved in studying the rhizosphere, the reasons for enhanced contaminant loss in the rhizosphere are not completely understood. [1][2][3][4][5]9 Nevertheless, the performance and reliability of vegetated pollution control systems, such as phytoremediation, monitored natural attenuation, and stormwater bioretention cells, could be optimized through more efficient design if the fundamental mechanisms involved in the rhizosphere effect were better characterized.…”

Distributions and compositions of old and emerging flame retardants in the rhizosphere and non-rhizosphere soil in an e-waste contaminated area of South China

“…The root-soil interface is complicated, and the fate of xenobiotic compounds in RS can be manipulated multifactorially. First, plant root exudates can activate the adhered compounds to pore water, and then enhance their transferability and bioavailability (Oleszczuk and Baran, 2007). Second, the degradation of xenobiotic compounds by indigenous microbes is improved, depending on the capacity of the contaminant degrader or plant promoting microbes to efficiently colonize growing roots (He et al, 2006;Gerhardt et al, 2009;Xia, 2012).…”