Heavy metals constitute some of the most significant environmental contaminants today. The abundance of naturally growing Tetraena qataranse around Ras Laffan oil and gas facilities in the state of Qatar reflects its toxitolerant character. This study examined the desert plant’s tolerance to Ba, Cd, Cr, Cu, Ni and Pb relative to soil concentration. Analysis by inductively coupled plasma – optical emission spectroscopy (ICP-OES) showed that the plant biomass accumulates higher Cd, Cr, Cu and Ni concentration than the soil, particularly in the root. The bioconcentration factor (BCF) of all metals in the root and shoot indicates the plant’s capacity to accumulate these metals. Cd had a translocation factor (TF) greater than one; however, it is less than one for all other metals, suggesting that the plant remediate Cd by phytoextraction, where it accumulates in the shoot and Cr, Cu and Ni through phytostabilization, concentrating the metals in the root. Metals phytostabilization restrict transport, shield animals from toxic species ingestion, and consequently prevent transmission across the food chain. Fourier Transform Infrared Spectroscopy (FTIR) analysis further corroborates ICP-OES quantitative data. Our results suggest that T. qataranse is tolerant of Cd, Cr, Cu, and Ni. Potentially, these metals can accumulate at higher concentration than shown here; hence, T. qataranse is a suitable candidate for toxic metals phytostabilization.

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The assessment of cadmium, chromium, copper, and nickel tolerance and bioaccumulation by shrub plant Tetraena qataranse

Integration of earthworms and arbuscular mycorrhizal fungi into phytoremediation of cadmium-contaminated soil by Solanum nigrum L.

The present study was conducted to analyze the effects of traffic volumes on Cd, Cu, Pb, Ni, and Zn contents in roadside soils and in two dominant herbaceous species (Achillea wilhelmsii and Cardaria draba) along highways and to evaluate the dynamic characteristics of these elements and their accumulation by the aerial parts and roots of these herbaceous species. The plant samples were collected along 700 m of a 9-km segment of each of the three major highways in Hamedan Province (West Iran) with different traffic volumes: Hamedan-Goltapeh (HG), Hamedan-Razan (HR), and Hamedan-Kermanshah (HK). The results indicated that the mean contents of Cd, Cu, Pb, Ni, and Zn in the soil samples were 0.26, 18.74, 14.98, 18.21, and 62.25 mg kg−1, respectively. Furthermore, the mean contents of elements (mg kg−1) in aerial parts of A. wilhelmsii were 0.16 for Cd, 4.52 for Cu, 1.91 for Pb, 1.70 for Ni, and 44.80 for Zn, while in the aerial part samples of C. draba, the concentrations (mg kg−1) and the mean contents were 0.16, 2.29, 2.58, 1.60, and 31.29, respectively. This meant that the traffic volume affected the contents of the metals in the soil and the herbaceous species. The metal content in herbaceous tissues varied significantly between plant species. A. wilhelmsii tended to accumulate the metals in the roots while C. draba retained them mostly in the aerial parts. The significant positive correlations of Cd, Cu, Ni, and Zn content in root and aerial parts of the herbaceous plant with those found in the soil samples showed the potential of the studied species for application in biomonitoring studies. Comprehensive analysis (effect of traffic volumes and relationships between the content of elements in plant tissues and soil samples) indicated that Cu in both herbaceous plants was mainly derived from soil, while A. wilhelmsii absorbed Cd and C. draba absorbed Zn mainly through the stomata from atmospheric depositions. Without considering atmospheric depositions due to intense traffic volumes, in A. wilhelmsii, the translocation factor (TF) values of Cu and Zn were 1.06 and 1.44, respectively and in C. draba, the TF values of Cd, Cu, and Pb were 1.06, 1.09, and 1.13, respectively, thus suggesting that both herbaceous species had high potentials for transferring metals from the roots to aerial parts.

Heavy metal concentrations in roadside plants (Achillea wilhelmsii and Cardaria draba) and soils along some highways in Hamedan, west of Iran

Exposure of heavy metals in coal gangue soil, in and outside the mining area using BCR conventional and vortex assisted and single step extraction methods. Impact on orchard grass.

Immobilization of cadmium by immobilized Alishewanella sp. WH16-1 with alginate-lotus seed pods in pot experiments of Cd-contaminated paddy soil.

Distribution and Phytoavailability of Heavy Metal Chemical Fractions in Artificial Soil on Rock Cut Slopes Alongside Railways

The stability of soil aggregates is regarded as the key factor for soil erosion resistance on cut slopes of engineering works in serious debris flow disaster areas. Information on the stability of soil aggregates and related physicochemical properties on cut slopes is helpful to maintain the soil quality and slope stability. Therefore, in order to evaluate the stability of artificial soil aggregates for cut slope restoration, soil samples from three positions of a cut slope restored with artificial soil (upper slope, URS; middle slope, MRS; lower slope, LRS) and a nearby natural slope (NS) were analyzed. The results showed that the stability of soil aggregates (MWD, mean weight diameter; GMD, geometric mean diameter) of artificial soil on the cut slope (URS, MRS, LRS) was significantly lower than that of NS based upon fast wetting (FW) test and wet sieving. The values of MWD and GMD for slow wetting (SW) and mechanical breakdown (WS) tests in the four slopes had no significant difference. Among the three positions of cut slope, URS had the highest MWD and GMD, whereas MRS had the lowest corresponding value. Furthermore, >2 mm soil aggregates accounted for a major percentage of the total weight determined in all the tests for each slope. MWD for fast wetting increased with the increase in content of soil organic matter (SOM). Slaking was the main disruptive force leading to the breakdown of artificial soil aggregates, and FW was the best method to measure the stability of soil aggregates in these conditions. These results demonstrate that the SOM and the stability of soil aggregates on cut slope should be given more attention while conducting engineering works in serious debris flow disaster areas.

Stability of artificial soil aggregates for cut slope restoration: A case study from the subalpine zone of southwest China

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Distribution and Phytoavailability of Heavy Metal Chemical Fractions in Artificial Soil on Rock Cut Slopes Alongside Railways

Stability of artificial soil aggregates for cut slope restoration: A case study from the subalpine zone of southwest China