Use of fly ash in reducing heavy metal toxicity to plants

An alkaline fly ash was used to reduce the metal toxicity of contaminated soil through immobilization of heavy metals. Pot culture studies were carried out with maize ( Zea mays) crop grown in acidic sandy loam (pH 4.9) and calcareous silty clay (pH 7.9) soils treated with known concentrations of he...

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Bibliographic Details
Published in:Resources, conservation and recycling conservation and recycling, 1994, Vol.12 (3), p.221-228
Main Authors: Shende, Abha, Juwarkar, A.S., Dara, S.S.
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Applied ecology
Biological and medical sciences
Ecotoxicology, biological effects of pollution
Effects of pollution and side effects of pesticides on plants and fungi
Fly ash
Fundamental and applied biological sciences. Psychology
Heavy metal
Immobilization
Non agrochemicals pollutants
Phytopathology. Animal pests. Plant and forest protection
Pollution effects and side effects of agrochemicals on crop plants and forest trees. Other anthropogenic factors
Pollution effects. Side effects of agrochemicals
Toxicity
Zea mays
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Summary:An alkaline fly ash was used to reduce the metal toxicity of contaminated soil through immobilization of heavy metals. Pot culture studies were carried out with maize ( Zea mays) crop grown in acidic sandy loam (pH 4.9) and calcareous silty clay (pH 7.9) soils treated with known concentrations of heavy metals (viz. cadmium, copper, nickel and zinc). Fly ash was mixed in metal-treated soil at the rate of 0%, 2%, 5%, 10%, 15%, 20%. The possible variation in metal toxicity to the plants due to fly ash treatment was ascertained through changes in growth patterns. Application of 2% and 5% of fly ash to the calcareous soil shows better growth response as compared to control soil. However, when the fly ash application exceeds 5%, the crop growth was significantly reduced. On the contrary, acidic soil shows positive response with a fly ash addition up to 20% but the resultant crop growth was lesser as compared to growth of plants in the virgin soil (i.e. soil as such, without fly ash and metal treatment). Fly ash addition effectively raised the pH of acidic soil and thus helped to reduce the metal solubility and availability to plants.
ISSN:0921-3449
1879-0658
DOI:10.1016/0921-3449(94)90010-8