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
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.
Available from: Khalid Rehman Hakeem
- "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.
Available from: Małgorzata Suska-Malawska
- "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.
Available from: scielo.br
- "A utilização de biossólidos em solos se depara com dois aspectos potencialmente conflitantes na legislação ambiental, em termos de destinação final dos resíduos, que são os critérios de sua utilização e a proteção do meio ambiente (Smith, 2009). Dentre os metais presentes nos biossólidos tem-se o Ni, identificado como um metal potencialmente tóxico no solo e constantemente monitorado em resíduos como, por exemplo, os biossólidos (Rooney et al., 2007). Para a legislação vigente (CONAMA, 2006), a concentração máxima permitida para aplicação de resíduos orgânicos na agricultura com relação ao DOI: http://dx.doi.org/10.1590/1807-1929/agriambi.v18n08p819–825 Luís F. Roveda et al. "
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ABSTRACT: The use of industrial biosolids in the agriculture may increase nickel levels in the soil. However, bioavailability of nickel may be influenced by several factors and nickel-rich residuals are not often directly related to high absorption of this metal by the plants. This study aimed to evaluate the nickel solubility in the soil, its bioavailability and accumulation by the plants. An experiment was conducted using strawberries as experimental model. Those were planted in earthen pots filled with Inceptisol with four replications. A fully randomized design was developed and six doses of nickel were employed: 0, 9, 18, 36, 72 and 144 mg per kg-1 of soil. Two nickel sources were employed: composted biosolid (organic source) and nickel chloride (mineral source). Both soil and plant nickel levels (the latter including roots, crow, aerial parts and fruits) were evaluated by using the following extractors: nitric acid + hydrochloric acid solution (3:1), calcium nitrate solution (0.5 mol L-1), nitric acid solution (1 mol L-1) and sodium pyrophosphate solution (0.1 mol L-1). Te highest and lowest nickel levels were yielded by the use of organic source by the nitric acid + hydrochloric acid solution and calcium nitrate solution, respectively. Both organic and mineral sources increased nickel levels in the strawberries tissues, with small increases verified for the organic source. Te highest levels were found in the roots whereas the lowest were obtained in the crow.
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