Activities of Cu2+ and Cd2+ in Soil Solutions as Affected by pH

Cavallaro, N.; McBride, Murray B.

doi:10.2136/sssaj1980.03615995004400040013x

Cited by 77 publications

(31 citation statements)

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“…6 In general, pH is the primary factor that governs heavy metal adsorption and availability, due to alterations in the metal species in solution and the variation in the intensity of deprotonation of the electrically charged surface. [7][8][9][10][11] However, while solubility of some metal ions (e.g. Ni and Cd) is strongly controlled by the pH, Cu retention does not seem to depend on this parameter alone.…”

Section: Introductionmentioning

confidence: 99%

Copper adsorption as a function of solution parameters of variable charge soils

Mouta¹,

Soares²,

Casagrande³

2008

J. Braz. Chem. Soc.

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Os efeitos do pH e da força iônica (I) sobre a adsorção de cobre (Cu) e a força direcional da reação em solos com cargas variáveis foram avaliados a partir de experimentos tipo "batch". Os resultados foram ajustados pelo modelo de Langmuir e, de acordo com as isotermas de adsorção, a afinidade de Cu (K L ) foi maior nas amostras do subsolo (0,061-0,468 L kg -1 ) do que na camada superficial (0,169-0,359 L kg -1 ). A adsorção máxima variou de 1114-2422 mg kg -1 (superfície) a 1002-1334 mg kg -1 (subsolo). Foi observada forte dependência da adsorção de Cu em relação ao pH nas amostras do subsolo, com nítido aumento da retenção de Cu (20-90%) no intervalo de pH do solo entre 4,0-5,0. A adsorção de Cu foi alterada pelo aumento da I e indicou diferentes mecanismos (esferas interna e externa) de retenção do metal. A reação foi favorável e espontânea, conforme indicado pelos valores negativos da variação da energia livre ( G) e pelo fator de separação K R < 1. A interface solo-solução e a adsorção de Cu foram termodinamicamente descritas por uma abordagem teórica. Adsorption reaction was favorable and spontaneous, as indicated by negative values of the free energy variation ( G) and the separation factor K R < 1. Soil-solution interface and Cu adsorption were also thermodynamically described by a theoretical approach. Effects of pH and ionic strength (I) on copper (Cu

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Section: Introductionmentioning

confidence: 99%

Copper adsorption as a function of solution parameters of variable charge soils

Mouta¹,

Soares²,

Casagrande³

2008

J. Braz. Chem. Soc.

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“…In the studied cultivated soils, pH and organic C appeared as the governing factors of the populations of Cu-resistant bacteria. These chemical properties are known to influence the fluxes of various fractions of Cu 3,7,10 Correlations were also observed between the percentage of Cu-resistant bacteria and SIR (R =0.48, p<0.05) and organic C (R =0.49, p<0.05). It is known that the available C pool supports the survival of bacteria under metal stressful conditions 32 .…”

Section: December 2008 Journal Of the National Science Foundation Of mentioning

confidence: 82%

“…Copper is known to accumulate in soils of intensively cultivated agricultural systems applied with high doses of fungicide and poultry manure 1,2 . Copper exists in the soil environment in different forms; exchangeable, sorbed, organically bound, precipitated, and residual [3][4][5][6][7] . The fraction of Cu in soil solution is governed directly by the quality and the quantity of organic matter, clay type, amount of Fe and Al oxides in soil and indirectly by soil pH 3,5,8,9 .…”

Section: Introductionmentioning

confidence: 99%

“…Copper exists in the soil environment in different forms; exchangeable, sorbed, organically bound, precipitated, and residual [3][4][5][6][7] . The fraction of Cu in soil solution is governed directly by the quality and the quantity of organic matter, clay type, amount of Fe and Al oxides in soil and indirectly by soil pH 3,5,8,9 . Copper speciation thus varied among soils with different soil characteristics 6,10 .…”

Section: Introductionmentioning

confidence: 99%

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Copper availability and selective microbiological properties of an intensively cultivated ultisol in Nuwara Eliya

Dandeniya

Ranil

2008

J. Natn. Sci. Foundation Sri Lanka

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Abstract:A study was undertaken to assess the effect of copper on microbiological properties of intensively cultivated vegetable fields at Nuwara Eliya. Soil samples were collected from six cultivated fields and an undisturbed forest were assessed for pH, total and DTPA extractable Cu, biomass nitrogen (BN) and substrate induced respiration (SIR). Total and Cu-resistant bacteria were enumerated using four agar media. Soil pH of experimental soils ranged from 4.44 to 5.44. Organic C content in cultivated soils varied from 1.8 to 3.3 % and it was 6.8% in forest soil. Total and DTPA extractable Cu contents varied from 14.4 to 25.6 mg kg -1 and 1.2 to 4.5 mg kg -1 , respectively. Forest soil showed the highest SIR (46 µg CO 2 g -1 soil h -1 ) and BN (267 µg N g -1 soil). The highest Cu-resistant bacterial population was 0.43% of the total population reported for the forest. Building up of Cu and increasing of population of Cu-resistant bacteria was not evident due to cultivation. The percentage of Cu-resistant bacteria correlated positively with DTPA extractable Cu (R = 0.49) suggesting that threshold Cu levels for bacterial growth in experimental soils remain within the range of extractable Cu concentrations reported. This relationship was influenced by soil organic C content and pH. Tryptic soy agar (TSA) medium produced higher percentages of Cu-resistant bacteria for both forest and cultivated soils. Those percentages showed linear relationships with total Cu (r 2 = 0.95) and percentage of DTPA extractable Cu (r 2 = 0.94) indicating suitability of the TSA medium to enumerate Cu-resistant bacteria.

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“…Many studies have examined the concentration and retention of metals in soils and the effect of various parameters on their adsorption and solubility, including pH (McBride and Blasiak, 1979;Cavallaro and McBride, 1980;Harter, 1983;Robb and Young, 1999;Green et al, 2003), redox conditions (Davranche and Bollinger, 2001;Davranche et al, 2003;Qafoku et al, 2003), amount of metals (Garcia-Miragaya, 1984;Basta and Tabatabai, 1992;Sauvé et al, 2000), cation exchange capacity (Ziper et al, 1988), organic matter content (Gerritse and Vandriel, 1984;Elliot et al, 1986;Benedetti et al, 1996aBenedetti et al, , 1996bKinniburgh et al, 1999;Kashem and Singh, 2001), soil mineralogy (Tiller et al, 1963;Jenne, 1968;Kinniburgh et al, 1976;Cavallaro and McBride, 1984;Kuo, 1986;Lindroos et al, 2003), biological and microbial conditions (Gerritse et al, 1992;Dumestre et al, 1999;Warren and Haack, 2001) as well as developing assemblage models to mechanistically predict these processes (Dzombak and Morel, 1987;Haworth, 1990;McBride et al, 1997;Celardin, 1999;Weng et al, 2002;Impellitteri et al, 2003, Tye et al, 2003. From these studies it has emerged that total soil metal content alone is not a good measure of short-term bioavailability and not a very useful tool to determine potential risks from soil contamination (Tack et al, 1995;…”

Section: Soil Pore Water and The Concept Of (Bio)availabilitymentioning

confidence: 99%

Overview of Selected Soil Pore Water Extraction Methods for the Determination of Potentially Toxic Elements in Contaminated Soils: Operational and Technical Aspects

Bonito¹,

Breward²,

Crout³

et al. 2008

Environmental Geochemistry

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Chemical elements that are either present naturally in the soil or introduced by pollution are more usefully estimated in terms of 'availability' of the element, since it is this property that can be related to mobility and uptake by plants. A good estimation of 'availability' can be achieved by measuring the concentration of the element in soil pore water. Recent achievements in analytical techniques allowed to expand the range of interest to trace elements, which play a crucial role both in contaminated and uncontaminated soils and include those defined as potentially toxic elements (PTE) in environmental studies. A complete chemical analysis of soil pore water represents a powerful diagnostic tool for the interpretation of many soil chemical phenomena relating to soil fertility, mineralogy, and environmental fate. This chapter describes some of the current methodologies used to extract soil pore water. In particular, four laboratory-based methods, i) high speed centrifugation-filtration, (ii) low (negative-) pressure Rhizon™ samplers, (iii) high pressure soil squeezing and (iv) equilibration of dilute soil suspensions, are described and discussed in detail. A number of operational factors are presented: pressure applicable (i.e., pore size involved), moisture pre-requisites of the soil, pore water yielding, efficiency, duration of extraction, materials and possible contaminations for PTE studies. Some consideration is then taken to assess advantages and disadvantages of the methods, including costs and materials availability.

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Activities of Cu2+ and Cd2+ in Soil Solutions as Affected by pH

Cited by 77 publications

References 0 publications

Copper adsorption as a function of solution parameters of variable charge soils

Copper adsorption as a function of solution parameters of variable charge soils

Copper availability and selective microbiological properties of an intensively cultivated ultisol in Nuwara Eliya

Overview of Selected Soil Pore Water Extraction Methods for the Determination of Potentially Toxic Elements in Contaminated Soils: Operational and Technical Aspects

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