Potential availability of heavy metals to phytoextraction from contaminated soils induced by exogenous humic substances

Halim, Mohammed; Conte, Pellegrino; Piccolo, Alessandro

doi:10.1016/s0045-6535(03)00185-1

Cited by 284 publications

(126 citation statements)

References 29 publications

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“…In contaminated soils, Chen (1996) and Halim et al (2003) found that HA addition decreased metal toxicity while Christensen and Christensen (1999) concluded that HA can also increase metal bioavailability as fragments of HA form metal chelates which are readily taken up by plants. Humic acid may be important in the solubility of certain metals only, and further investigation is warranted.…”

Section: Future Directionsmentioning

confidence: 99%

Compost application affects metal uptake in plants grown in urban garden soils and potential human health risk

2011

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Purpose This study explores the effect of varying organic matter content on the potential human health risk of consuming vegetables grown in urban garden soils. Results and discussion Overall, the consumption of lettuce and green bean pods grown in some urban gardens posed a potential human health risk due to unacceptably high concentrations of cadmium or lead. In many cases, compost amendment increased the accumulation of metals in the vegetables. Even in soils considered uncontaminated by current guidelines, some hazard quotients exceeded the threshold value of 1. The compost used in this study had a high fulvic acid to humic acid ratio, which may explain increased concentrations of metals in plants grown in compost-amended soils. Materials and methodsConclusions These results indicate a need to include soil characteristics, specifically organic matter quality, when setting threshold criteria for metal content of urban garden soils.

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Section: Future Directionsmentioning

confidence: 99%

Compost application affects metal uptake in plants grown in urban garden soils and potential human health risk

2011

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“…Leonardite-derived humic substances apparently meet all of the above requirements (Senesi et al, 1991;Halim et al, 2003;Yuan and Theng, 2011). The humic substances in question contain only trace amount of heavy metals (Cd 0.16, Pb 9.59, Cu 12.49, Cr 8.73, As 6.41 Ni 13.93, Zn 37.56 mg/kg), far below the allowable metal concentration limit for farmland (The Ministry of Environmental Protection of People's Republic of China, 2006), Based on the trade-off between Cd removal efficiency and operational cost (e.g., time, water availability, and humic substances consumption), proper washing conditions can be determined to suit local soil properties, contamination levels, and remediation requirements.…”

Section: Potential Application Of Humic Substances In Soil Remediationmentioning

confidence: 97%

Humic substances as a washing agent for Cd-contaminated soils

et al. 2017

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“…Organic matter contributes to a decrease in contaminated soil's metal availability for plants (Halim et al 2003).…”

Section: Effect Of Soils With Different Organic Contentsmentioning

confidence: 99%

Chelator-enhanced phytoextraction of copper and zinc by sunflower, Chinese cabbage, cattails and reeds

Yeh

Lin

et al. 2014

Int. J. Environ. Sci. Technol.

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The phytoextraction of copper and zinc assisted by the chelators such as ethylene diamine tetraacetic acid, diethylene triamino pentaacetic acid, ethylene diamine disuccinate and citric acid into sunflowers (Hh can act as effective cation exchangers. The negatively charged chelator complexes prevented binding to the cell walls of the roots and allowed complexes to enter the cells. Organic content contains fewer soil nutrients and has fewer negatively charged functional groups, such as carboxical, phenolical and hydroxyl; these adsorb negative free metal cations and reduce metal mobility, leading to less plant uptake. Regardless of different soils' varying organic content, plant propagation ability can be listed in descending order as follows: cattails [ reeds [ sunflowers [ Chinese cabbage. The mechanism of metal uptake was apoplastic transportation. Metal accumulation levels in different parts of plants are listed in descending order as follows: roots [ stems [ leaves. This is similar to the findings of most studies.

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Potential availability of heavy metals to phytoextraction from contaminated soils induced by exogenous humic substances

Cited by 284 publications

References 29 publications

Compost application affects metal uptake in plants grown in urban garden soils and potential human health risk

Compost application affects metal uptake in plants grown in urban garden soils and potential human health risk

Humic substances as a washing agent for Cd-contaminated soils

Chelator-enhanced phytoextraction of copper and zinc by sunflower, Chinese cabbage, cattails and reeds

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