Reactions Controlling Heavy Metal Solubility in Soils

McBride, Murray B.

doi:10.1007/978-1-4613-8847-0_1

Cited by 507 publications

(330 citation statements)

References 166 publications

(162 reference statements)

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“…Excetuando estes solos, os demais apresentaram maior Cd %des quando a adsorção ocorreu em pH 5,5, comparativamente ao pH 4,5 e 6,5. A menor Cd %des em pH 4,5 (média de 20 %), comparativamente ao pH 5,5 (média 40 %), revela que a adsorção em pH 4,5 pode ser predominantemente mais específica que em pH 5,5, ocorrendo via mecanismos de quimissorção (como, por exemplo, ligações covalentes), conforme McBride (1989).…”

Section: Resultsunclassified

“…Embora seja um dos principais processos controladores da biodisponibilidade de Cd no ambiente, comparativamente à adsorção, a dessorção tem sido freqüentemente negligenciada na literatura Wang & Xing, 2002). Em pH ácido, a dessorção de Cd é favorecida, pois íons H + podem deslocar uma fração do metal adsorvido em forma não-trocável (McBride, 1989). Ma & Lindsay (1995) relatam que a atividade de Cd 2+ em solução é altamente dependente do pH (coeficientes de correlação entre a atividade do cátion e o pH > 0,9 e > 0,8 para solos contaminados e não contaminados, respectivamente).…”

Section: Introductionunclassified

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Efeito do pH na adsorção e dessorção de cádmio em Latossolos brasileiros

Pierangeli

Guilherme

Curi

et al. 2005

Rev. Bras. Ciênc. Solo

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Section: Resultsunclassified

Section: Introductionunclassified

Efeito do pH na adsorção e dessorção de cádmio em Latossolos brasileiros

Pierangeli

Guilherme

Curi

et al. 2005

Rev. Bras. Ciênc. Solo

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“…These application quantities are primarily based on phyto-toxicological aspects. It is widely accepted that sorption is an important process controlling mobility and thereby transportation of heavy metals in soil [31,32]. More appropriate sludge application estimates may be obtained from site-specific sorption information [33].…”

Section: Discussionmentioning

confidence: 99%

Metal sorption on soils as affected by the dissolved organic matter in sewage sludge and the relative calculation of sewage sludge application

Liu

Zhang

et al. 2007

Journal of Hazardous Materials

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To evaluate the influences of sewage sludge-derived organic matters on metal sorption and on the resultant sludge loading estimates, a batch experiment was conducted to compare the sorption of Ni, Cu and Pb in sewage sludge filtrates (1:20 sewage sludge to water) on eight soils and the adsorption of metals in a reference solution which had the same matrix as the sewage sludge filtrate except dissolved organic material (henceforth referred to as reference solution). Metal sorption could be well fitted by linear isotherm and the dissolved organic matter in sludge significantly depressed the sorption (p < 0.01). The main factor controlling sorption of Ni on different soils was dominated by soil cation exchange capacity (CEC) and sorption of Cu and Pb was by soil organic matter (SOM). The parameters obtained from the sorption isotherm equations were then used to estimate sludge loadings into the soils. When the sorption parameters derived from the reference solution were used for calculation, that is the effect of dissolved organic matter was not considered, the calculated safe application rates are approximately 47.8, 51.4, 34.2, 31.3, 21.7, 46.3, 187.1 and 27.6 t-sludge/ha for the Beijing, Jiangxi, Xiamen, Jilin, Guangdong, Wuhan, Gansu and Xinjiang soils, respectively. However, when the sorption parameters derived from the dissolved organo-metallic complexes are used for calculation, the corresponding application rates are reduced to approximately 6.0, 3.4, 1.9, 10.0, 6.3, 3.6, 7.3 and 3.5 t-sludge/ha, respectively. By this study we can get a conclusion that the effect of sewage sludge derived dissolved organic matter on heavy metal sorption and soil properties should be considered in the course of regulating the safe application rates of sewage sludge to soil.

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“…For layer silicates, however, irreversible or non-exchangeable metal sorption may be via several mecha nisms. On such materials, reaction may occur at clay edge sites (McBride, 1989;Pardo, 2000;Strawn and Sparks, 1999), as occlusion into cavities/deformities on planar sur faces (Nakhone, 1997), and as fixation in interlayer positions of 2:1 phyllosilicates. This last mechanism is a possibility when the selectivity exhibited by the interlayer for a metal iondCa, Cd, and Pb in this studydis much larger than the se lectivity of the interlayer for the extracting ion (Na in this study) (Sposito et al, 1983).…”

Section: Mechanisms Of Metal Sorptionmentioning

confidence: 99%

Sequential sorption of lead and cadmium in three tropical soils

Appel

Lena

Rhue

et al. 2008

Environmental Pollution

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The sorption and desorption of Pb and Cd in tropical soils is strongly influenced by the order in which these metals enter the soil environment. AbstractIt is important to examine mechanisms of Pb and Cd sorption in soils to understand their bioavailability. The ability of three tropical soils to retain Pb, Cd, and Ca was evaluated. The objectives of this study were to (1) determine the extent to which soil sorption sites are metal specific, (2) investigate the nature of reactions between metals and soil surfaces, and (3) identify how metals compete for sorption sites when they are introduced to soils sequentially or concurrently. Lead was shown to be much less exchangeable than Cd and inhibited Cd sorption. Cadmium had little effect on Pb sorption, though both Ca and Cd inhibited the adsorption of Pb at exchange sites. Lead appears to more readily undergo innersphere surface complexation with soil surface functional groups than either Cd or Ca. Thus, regardless of when Pb is introduced to a soil, it should be less labile than Cd.

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Reactions Controlling Heavy Metal Solubility in Soils

Cited by 507 publications

References 166 publications

Efeito do pH na adsorção e dessorção de cádmio em Latossolos brasileiros

Efeito do pH na adsorção e dessorção de cádmio em Latossolos brasileiros

Metal sorption on soils as affected by the dissolved organic matter in sewage sludge and the relative calculation of sewage sludge application

Sequential sorption of lead and cadmium in three tropical soils

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