scholarly journals The Combination of DGT Technique and Traditional Chemical Methods for Evaluation of Cadmium Bioavailability in Contaminated Soils with Organic Amendment

2016 ◽  
Vol 13 (6) ◽  
pp. 595 ◽  
Author(s):  
Yu Yao ◽  
Qin Sun ◽  
Chao Wang ◽  
Pei-Fang Wang ◽  
Ling-Zhan Miao ◽  
...  
Keyword(s):  
Contaminated Soils ◽  
Organic Amendment ◽  
Chemical Methods ◽  
Cadmium Bioavailability

Retention and plant availability of chromium in soils as affected by lime and organic matter amendments

Soil Research ◽  
2001 ◽  
Vol 39 (5) ◽  
pp. 1091 ◽  
Author(s):  
N. S. Bolan ◽  
S. Thiagarajan
Keyword(s):  
Organic Matter ◽  
Pinus Radiata ◽  
Contaminated Soils ◽  
Opposite Effect ◽  
Organic Amendment ◽  
Column Experiments ◽  
Fluidised Bed ◽  
Tannery Industry ◽  
Cr Concentration ◽  
Pinus Radiata Bark

Chromium is used as Cr(III) in the tannery industry and as Cr(VI) in the timber treatment industry. In this experiment, the effect of 2 liming materials [fluidised bed boiler ash (FBA) and lime] and an organic amendment (Pinus radiata bark) on the retention of Cr by 2 soils (Egmont and Tokomaru) was examined using both ‘batch’ and ‘column’ experiments. The effect of these amendments on the uptake of Cr from the Egmont soil, treated with various levels of Cr (0–3200 mg Cr/kg soil), was examined using sunflower (Helianthus annuus) plants. The transformation of Cr was examined by fractionation of Cr in soils. Addition of FBA and lime increased the retention of Cr(III), but had the opposite effect on the retention of Cr(VI). Addition of bark did not affect the retention of Cr(III), but it increased the retention of Cr(VI). Increasing additions of Cr increased Cr concentration in plants, resulting in decreased plant growth. The liming materials were found to be effective in reducing the phytotoxicity of Cr(III) and the Pinus radiata bark was effective for Cr(VI). In both Cr(III)- and Cr(VI)-contaminated soils, the concentrations of Cr were higher in the organic-bound, oxide-bound, and residual fractions than in the soluble and the exchangeable fractions. The concentrations of Cr in the soluble and the exchangeable fractions were higher in the Cr(VI)-contaminated than the Cr(III)-contaminated soil. Addition of the liming materials decreased the concentration of the soluble Cr(III) and bark decreased soluble Cr(VI) in soil. There was evidence for the reduction of Cr(VI) to Cr(III) in the bark-treated soils.

scholarly journals Phytoremediation of petroleum hydrocarbons contaminated soils with alfalfa (Medicago sativa)

2017 ◽  
Author(s):  
Charlotte Marchand ◽  
Fabio Kaczala ◽  
Yahya Jani ◽  
William Hogland
Keyword(s):  
Medicago Sativa ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Petroleum Hydrocarbons ◽  
Organic Amendment ◽  
Hazardous Materials ◽  
Underground Storage Tanks ◽  
Soil Sediment ◽  
Survival Capacity ◽  
Petroleum Contaminated Soil

Underground storage tanks uses for waste cars draining contain many hazardous materials including hydrocarbons. These compounds pose a significant threat to the environment and affect negatively the health of living. Phytoremediation is an environmental friendly method used during the last few decades to eliminating organics pollutants from soil, sediment and water. The remediation capability of alfalfa (Medicago sativa) to treat petroleum-contaminated soil from an old car scrap yard in Nybro, Sweden was further investigated using greenhouse pot-scale experiments. After five months, alfalfa survival capacity and dry biomass were significantly lower in contaminated soil (CS) in comparison to non-contaminated soil (NCS). Only 5% of plants survived in CS and petroleum hydrocarbon C10-C50 content in planted treatment were not statistically lower in comparison to the unplanted treatment. Further studies are in process to evaluate the possible degradation of hydrocarbons using organic amendment

scholarly journals Recent advances in chemical methods for remediation of heavy metals contaminated soils: A Review

2018 ◽  
Vol 4 (2) ◽  
pp. 45-50
Author(s):  
Aisha A. Waris ◽  
Tabinda Athar ◽  
Madiha Nisar
Keyword(s):  
Heavy Metals ◽  
Contaminated Soils ◽  
Chemical Methods ◽  
Recent Advances

Cadmium Contamination, Bioavailability, Uptake Mechanism and Remediation Strategies in Soil-Plant-Environment System: a Critical Review

2020 ◽  
Vol 17 (1) ◽  
pp. 49-60
Author(s):  
Umair Riaz ◽  
Ambreen Aslam ◽  
Qamar uz Zaman ◽  
Sabiha Javeid ◽  
Rehman Gul ◽  
...  
Keyword(s):  
Human Health ◽  
Contaminated Soils ◽  
Cadmium Toxicity ◽  
Cost Effective ◽  
Health Concern ◽  
Continuous Exposure ◽  
Cadmium Contamination ◽  
Uptake Mechanism ◽  
Remediation Strategies ◽  
Cadmium Bioavailability

Background: Cadmium contamination is becoming an important issue globally due to its high toxicity and carcinogenicity, leading to detrimental effects on both environmental and human health. This review paper discusses the different sources of cadmium, its toxic effects on the environment and human health, and the influence of different soil factors in changing the speciation and bioavailability of cadmium in soil. This paper also covers research on different remediation strategies currently available for reducing cadmium bioavailability. Methods: Previous research and critical comparison of cadmium extent, toxicity, effects and management were studied Results: The carcinogenic nature of Cadmium is of significant human health concern. Cadmium is found in both free and complexed forms, where its availability depends on its speciation in soil. In soil, oxidizing conditions and high pH decrease cadmium bioavailability and speciation. Here, organic matter can also act as both a sink and source of cadmium and microbes perform many mobilization processes including protonation, chelation, and chemical transformation whereas, sorption or precipitation decreases cadmium availability. Continuous exposure to cadmium can result in browning, decomposing and mucilaginous roots, shoot reduction and apical growth of root, chlorosis, and rolling of leaves. Toxicity may inhibit lateral root formation or can result in rigid, twisted, and browning of the main root. Toxicity also affects photosynthesis and the availability of mineral nutrients. In this paper, the remediation techniques of soil polluted by Cd, including biological, chemical and physical remediation are reviewed. The methods of remediation, developing trends, drawbacks, and strengths were also reviewed to provide a reference for the research in this field to date. Conclusion: Although cadmium toxicity is of great concern, many remediation techniques can be successfully used to mitigate its adverse effects. Phytoremediation, hyperaccumulation, bioremediation, and the application of different amendments to the soil have all been successful in alleviating cadmium bioavailability. Amongst all available techniques, in-situ immobilization with inorganic, organic or clay amendments is an environmentally friendly and cost-effective strategy to remediate cadmium contaminated soils and achieve sustainable agriculture production.

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