Surface Charge and Solute Interactions in Soils

Bolan, Nanthi; Naidu, Ravi; Syers, J. K.; Tillman, R. W.

doi:10.1016/s0065-2113(08)60514-3

Cited by 176 publications

(74 citation statements)

References 148 publications

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“…This could be a reason to the low elution percentage of bacteria observed with kaolinitic clay with a low surface charge (C mol kg À1 at pH of 7) of À13 compared with smectite clays ranging between À21 to À127. 37 Sandy loam which contains a significant proportion of silt and relatively low charge (À2) had a high level (78.8%) of bacteria elution. Furthermore, it is thought that electrostatic attraction between 2 negatively charged particles is a result of polyvalent cations providing a bridging capacity, coupled with weak electrostatic repulsion upon closer interaction resulting in adsorption due to hydrogen bonds and Van der Waal's forces (fluctuating dipole-induced dipole).…”

Section: Dielectrophoretic Characterizationmentioning

confidence: 95%

Dielectrophoretic sample preparation for environmental monitoring of microorganisms: Soil particle removal

2014

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Detection of pathogens from environmental samples is often hampered by sensors interacting with environmental particles such as soot, pollen, or environmental dust such as soil or clay. These particles may be of similar size to the target bacterium, preventing removal by filtration, but may non-specifically bind to sensor surfaces, fouling them and causing artefactual results. In this paper, we report the selective manipulation of soil particles using an AC electrokinetic microfluidic system. Four heterogeneous soil samples (smectic clay, kaolinitic clay, peaty loam, and sandy loam) were characterised using dielectrophoresis to identify the electrical difference to a target organism. A flow-cell device was then constructed to evaluate dielectrophoretic separation of bacteria and clay in a continous flow through mode. The average separation efficiency of the system across all soil types was found to be 68.7% with a maximal separation efficiency for kaolinitic clay at 87.6%. This represents the first attempt to separate soil particles from bacteria using dielectrophoresis and indicate that the technique shows significant promise; with appropriate system optimisation, we believe that this preliminary study represents an opportunity to develop a simple yet highly effective sample processing system

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Section: Dielectrophoretic Characterizationmentioning

confidence: 95%

Dielectrophoretic sample preparation for environmental monitoring of microorganisms: Soil particle removal

2014

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“…1994). 여러 연구결과에서 토양의 음하전도가 증가하면 양하전을 띠는 중금속 이온의 흡착이 증가된다고 보고하였다 (Bolan et al, 1999(Bolan et al, , 2003(Bolan et al, , 2013Hong et al, 2007). 따라서 토양의 pH가 증대하게 되면 식물이 이용 가능 한 형태의 Cd, Cu, Pb, Zn과 같은 양이온의 중금속 함량이 감 소한다 (Singh et al, 1995).…”

Section: 공업단지 인근 토양 시료 채취unclassified

Monitering of Heavy Metal (loid)s Contamination of Arable Soils near Industrial Complexes in Gyeongnam Province of South Korea

Park¹,

Lee²,

Hong³

2016

Korean Journal of Soil Science and Fertilizer

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There are a number of industrial complexes which could be a source of heavy metal (loid)s contamination of arable soil in Gyeongnam province of South Korea. Heavy metal (loid)s accumulation of plant is more related to the concentration of plant available heavy metal (loid)s in arable soil than that of total heavy metal (loid)s. The objectives of this study were 1) to examine heavy metal concentrations in soils located near industrial complexes in Gyeongnam province and 2) to determine the relationship between concentration of plant available heavy metal (loid)s and chemical properties of soil. Soil samples were collected from 85 sites of arable lands nearby 7 industrial complexes in Gyeongnam province. Total heavy metal (loid)s concentration, available heavy metal (loid)s concentration, and chemical properties of collected soils were measured. The mean concentrations of arsenic (As), cadmium (Cd), copper (Cu), lead (Pb), and zinc (Zn) in the soils were 5.8 mg kg , respectively. Total concentration of Cd and Zn in arable soil located near ∇∇ industrial complex exceeded the warning criteria (4 mg kg -1 and 300 mg kg -1 for Cd and Zn, respectively) as described by in the soil environmental conservation Act of Korea. The concentration of plant available heavy metal (loid)s was negatively related to the soil pH and available Pb and Zn concentrations had relatively high correlation coefficient when compared with other heavy metal (loid)s. The concentration of plant available Pb and Zn was negatively related to that of organic matter (OM). Based on the above results, it might be a good soil management to control pH and OM concentration with soil amendments such as lime and compost to reduce phytoavailability of heavy metal (loid)s in arable soil located near industrial complex.

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“…From an environmental standpoint, soils often serve as "filters" for contaminants (Bolan et al, 1999). However, the filtering capacity of soils is not limitless and can be compromised by airborne pollutants, by the disposal of industrial and urban liquid and solid wastes, and by toxic and radioactive materials.…”

Section: Introductionmentioning

confidence: 99%

Sequential extraction and speciation of Ba, Cu, Ni, Pb and Zn in soil contaminated with automotive industry waste

Nogueirol

Alleoni

2013

Chemical Speciation & Bioavailability

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Sequential extraction or fractionation of heavy metals in the solid phase and their speciation in soil solution are important tools for assessing changes resulting from land use and/or pollution. The distribution of the various forms of Ba, Cu, Ni, Pb and Zn was evaluated in soil samples taken from a polluted area, and the speciation of cations and anions in a soil solution contaminated with automotive industry waste. We evaluated the sequential extraction and speciation of Ba, Cu, Ni, Pb and Zn in a Leptosol associated with a Cambisol and contaminated with automotive industry waste. Soil samples were collected at 0-0.2 m (a mix of soil and waste); 0.2-0.4 m (waste only), and 0.4-0.6 m (soil only) both in the polluted area and in two contiguous unpolluted areas: a sugarcane plantation and a forest fragment. Total concentrations of metals in the polluted area were above limits for intervention established by European Community regulations. Cu was mostly distributed in the residual and in the oxide-bonded fractions, except for the waste-only sample, in which the carbonate-bonded fraction was significant. Zn was concentrated in the residual and carbonate-bonded fractions, while Ba, Ni and Pb predominated in the residual fraction of the contaminated samples. Metals in the soil solution were predominantly in the hydroxyl forms, except for Ba, which was mostly in the ionic form (Ba 2+ ).

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Surface Charge and Solute Interactions in Soils

Cited by 176 publications

References 148 publications

Dielectrophoretic sample preparation for environmental monitoring of microorganisms: Soil particle removal

Dielectrophoretic sample preparation for environmental monitoring of microorganisms: Soil particle removal

Monitering of Heavy Metal (loid)s Contamination of Arable Soils near Industrial Complexes in Gyeongnam Province of South Korea

Sequential extraction and speciation of Ba, Cu, Ni, Pb and Zn in soil contaminated with automotive industry waste

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