Phytotoxicity of nickel in a range of European soils: Influence of soil properties, Ni solubility speciation

Agriculture and Environment Division, Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, UK.
Environmental Pollution (Impact Factor: 4.14). 02/2007; 145(2):596-605. DOI: 10.1016/j.envpol.2006.04.008
Source: PubMed


We investigated the influence of soil properties on Ni toxicity to barley root and tomato shoot growth, using 16 European soils. The effective concentration of added Ni causing 50% inhibition (EC(50)) ranged from 52 to 1929mgkg(-1) and from 17 to 920mgkg(-1) for the barley and tomato test, respectively, representing 37- and 54-fold variation among soils. Soil cation exchange capacity was the best single predictor for the EC(50). The EC(50) based on either the Ni concentration or free Ni(2+) activity in soil solution varied less among soils (7-14 fold) than that based on the total added Ni, suggesting that solubility of Ni is a key factor influencing its toxicity to plants. The EC(50) for free Ni(2+) activity from the barley test decreased with increasing pH, indicating a protective effect of protons. The results can be used in the risk assessment of Ni in the terrestrial environment.

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    • "Decrease in sorption of metals in soils may be due to protonation of OM and other charged sites caused by low pH (Clemente et al., 2005). Another reason of decreasing metal adsorption in soil may be the competition of metals with H + for sorption sites (Rooney et al., 2007; Weng and Huang, 2004). Conversely, high pH increases adsorption of metals due to hydrolysis of metal thus decreasing solvation energies of hydrolysed metal. "
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    ABSTRACT: Metals occur in soils through natural and anthropogenic sources. Metals enter into the human food chain through plant uptake and thus cause human health problems. Different techniques are used for the safe use of metal-contaminated soils. Growing plants to remediate metal-contaminated soils (phytoremediation) is a good technique for soils with low to moderate levels of metal contamination. However, adverse growth conditions due to low fertility, metal toxicity and physico-chemical conditions restricted the plant growth. Addition of amendments to immobilize the metals is common practice to detoxify the metals in the soils. Among amendments, organic amendments are important due to their role in improving soil physico-chemical, biological properties and nutrient availability and thus favour the plant growth and re-vegetation of contaminated soils. Organic amendments undergo transformation with time due to decomposition of organic matter and thus their effect on phytoavailability of metals is greatly altered. However, the immobilizing effects of organic amendments at the initial stage after their application are important for re-vegetation of metal-contaminated soils. In this chapter, we discuss the role of organic amendments to immobilize metals, improve plant growth and subsequent release of metals due to decomposition of organic matter.
    Soil Remediation and Plants, Edited by Khalid Rehman HakeemMuhammad SabirMünir ÖztürkAhmet Ruhi Mermut, 12/2015: pages 503-523; Academic Press., ISBN: 9780127999371
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    • "Phytotoxic nickel concentrations vary widely among plant species and cultivars and have been reported in the range 40 to 246 mg kg -1 (Kabata-Pendias and Pendias 2001). Nickel phytotoxicity has been frequently studied with commonly reported symptoms including chlorosis followed by yellowing and necrosis of leaves, restricted growth, and tissue injury (Kabata-Pendias and Mukherjee 2007, Rooney et al. 2007, Environment Agency 2009b). According to the Institute of Soil Science and Plant Cultivation (IUNG), a normal concentration of Ni in soil ranges from 2 to 50 mg kg -1 and a permissible threshold value is 50 mg kg -1 (Szczepocka 2005). "
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    ABSTRACT: Heavy metal (As, Mn, Ni, Sn, Ti) concentrations were determined in soil and plant samples collected in different areas of the railway junction Iława Główna, Poland. Soil and plant samples were collected in four functional parts of the junction, i.e. the loading ramp, main track within the platform area, rolling stock cleaning bay and the railway siding. Four plant species occurring in relatively higher abundance were selected for heavy metals analysis, although in the loading ramp and platform areas only one species could be collected in the amount which makes chemical analysis possible. The selected species included three perennials (Daucus carota, Pastinaca sativa and Taraxacum offi cinale) and one annual plant (Sonchus oleraceus). The entire area of the railway junction showed elevated concentrations of heavy metals when compared to the control level. It was most pronounced for the platform area and railway siding. The concentration of arsenic, manganese and nickel in plants growing in these parts of the junction exceeded the toxic level. The highest contamination of soil and plants found in the platform area suggested advanced emission process of the analyzed metals from wheel and track abrasion. Literature review showed that the concentration of the investigated metals in soil was generally higher than that found in centers of cities and along traffi c roads proving that the railway is an important linear source of soil contamination.
    Archives of Environmental Protection 01/2015; 41(1):35-42. · 0.86 Impact Factor
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    • "It has been widely recognized that elevated concentrations of Ni can exert toxic effects on aquatic and soil organisms (Rooney et al., 2007; Lock and Janssen, 2002; Kozlova et al., 2009). Many empirical models have been developed to predict Ni bioavailability and toxicity to plants and invertebrates using different soil properties, such as pH, organic matter content, and cation exchange capacity (CEC) (e.g., Rooney et al., 2007; Smolders et al., 2009). The predictive ability of the developed models seemed to be good, however these empirical models did not provide much mechanistic insight into metal uptake and toxicity. "
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    ABSTRACT: Protons and other cations may inhibit metal uptake and alleviate metal toxicity in aquatic organisms, but less is known about these interactions in soil organisms. The present study investigated the influence of solution chemistry on uptake and toxicity of Ni in Enchytraeus crypticus after 14 days exposure. Ca2+, Mg2+ and Na+ were found to exert significant effects on both uptake and toxicity of Ni. An extended Langmuir model, which incorporated cation competition effects, well predicted Ni uptake. The LC50{Ni2+} predicted by a developed Biotic Ligand Model matched well with observed values. These suggest that cation competition needs to be taken into account when modelling uptake and effects. The binding constants of Ni2+, Mg2+ and Na+ on the uptake and toxic action sites were similar, but for Ca2+ they differed. This indicates that the effect of Ca2+ on Ni2+ toxicity cannot simply be explained by the competition for entry into organism.
    Environmental Pollution 05/2014; 188:17–26. DOI:10.1016/j.envpol.2014.01.013 · 4.14 Impact Factor
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