Competitive sorption of copper, nickel, and zinc by an Oxisol

Bibak, Allan

doi:10.1080/00103629709369843

Cited by 12 publications

(7 citation statements)

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“…Observing in various works the soil/solution ratios used, one can see that there is credibility in this ‘solids effect’. The K d values found in our study are similar to those reported by Bibak (1997) who used a soil/solution ratio of 1:500 and reported a K d of 37.9 L kg −1 for Cu and a K d of 14.3 L kg −1 for Zn (Table 3). Conversely, Yuan and Lavkulich (1997) found K d values of 2400 L kg −1 and 1200 L kg −1 for Cu and Zn, respectively, using a much higher soil/solution ratio of 1:40.…”

Section: Resultssupporting

confidence: 90%

“…4c) when infiltrated as a pair, decreased their K d compared with their monometal state 2.6 times in the case of Ni and 2.3 times in the case of Zn. Similar rates of decrease of the Cu, Ni, and Zn K d values due to competition are also evident in other works (Harter, 1992; Bibak, 1997; Echeverria et al, 1998), although there is a considerable variation in the initial monometal K d values reported in these studies (Table 3). This shows that, although metal mobility increases when metals are in competition for the common adsorption sites of the soil, the least mobile elements (like Cu) increase their mobility much less than do the more mobile metals.…”

Section: Resultssupporting

confidence: 87%

“…Another problem concerning BAT is that they do not represent real field conditions in two main ways. First, they are conducted at relatively high and widely varying soil/solution ratios, which range from as low as 1:2.5 (Filius et al, 1998) and 1:25 (Tsadilas et al, 1997) to as high as 1:204 (Atanassova, 1999) and 1:500 (Bibak, 1997). This makes conditions different from field situations and results difficult to compare, because the retention capacities of soils are altered when soil/solution ratios vary (Harter and Naidu, 2001).…”

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confidence: 99%

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Single‐Element and Competitive Metal Mobility Measured with Column Infiltration and Batch Tests

2007

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The distribution coefficient, Kd, is often used to quantify heavy metal mobility in soils. Batch sorption or column infiltration tests may be used to measure Kd. The latter are closer to natural soil conditions, but are difficult to conduct in clays. This difficulty can be overcome by using a laboratory centrifuge. An acceleration of 2600 gravities was applied to columns of London Clay, an Eocene clay sub-stratum, and Cu, Ni, and Zn mobility was measured in centrifuge infiltration tests, both as single elements and in dual competition. Single-element Kd values were also obtained from batch sorption tests, and the results from the two techniques were compared. It was found that Kd values obtained by batch tests vary considerably depending on the metal concentration, while infiltration tests provided a single Kd value for each metal. This was typically in the lower end of the range of the batch test Kd values. For both tests, the order of mobility was Ni>Zn>Cu. Metals became more mobile in competition than when in single-element systems: Ni Kd decreased 3.3 times and Zn Kd 3.4 times when they competed with Cu, while Cu decreased only 1.2 times when in competition with either Ni or Zn. Our study showed that competitive sorption between metals increases the mobility of those metals less strongly bound more than it increases the mobility of more strongly bound metals.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 87%

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confidence: 99%

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Single‐Element and Competitive Metal Mobility Measured with Column Infiltration and Batch Tests

2007

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“…Essas equações, embora não esclareçam sobre os mecanismos químicos envolvidos na adsorção, são facilmente aplicáveis para adsorção de quaisquer íons pelo solo e têm a vantagem de fornecer parâmetros que possam ser relacionados com propriedades dos solos. A adsorção de Cu e de Zn varia entre solos e pode ser influenciada por diversas propriedades, tais como: pH, teor de matéria orgânica, composição mineralógica e textura (Shuman, 1975;McBride & Blasiak, 1979;Martínez & Motto, 2000) ou pela competição entre íons pelas superfícies adsorventes (Bibak, 1997;Mesquita, 1998;Echeverría et al, 1998).…”

Section: Introductionunclassified

Correlação entre características de latossolos e parâmetros de equações de adsorção de cobre e zinco

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2004

Rev. Bras. Ciênc. Solo

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RESUMOA adsorção de Cu e Zn é um dos principais fenômenos responsáveis pela disponibilidade desses elementos para as plantas. Portanto, estudos sobre a adsorção desses elementos em solos podem ser ferramentas úteis para compreensão da relação entre características dos solos e retenção desses micronutrientes. Nesse sentido, o presente trabalho objetivou caracterizar a adsorção de Cu e Zn em amostras de seis Latossolos de Minas Gerais e as influências de características dos solos sobre os parâmetros de adsorção obtidos pelas equações de Langmuir e de Freundlich. Para tanto, foram utilizadas soluções de cloreto de cobre e cloreto de zinco nas concentrações 0, 10, 20, 40, 60, 80, 100, 120 e 140 mg L -1 , ajustadas a pH 5,5. As equações de Langmuir e Freundlich foram eficientes na determinação dos parâmetros de adsorção de Zn e Cu, sendo os teores de argila e de matéria orgânica, respectivamente, as características mais bem relacionadas com a capacidade de adsorção desses elementos pelos solos. Os solos estudados apresentaram maior energia de ligação dos sítios de troca e maior capacidade de adsorção máxima para Cu relativamente ao Zn. O P remanescente não se correlacionou com os parâmetros de adsorção de Zn, em virtude, provavelmente, da influência da matéria orgânica em sua determinação. Este fato pode limitar sua eficiência na previsão da adsorção deste elemento em solos com alto teor de C orgânico.

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“…Embora numerosos estudos tenham examinado a adsorção de micronutrientes em solos, especialmente de Cu e de Zn (Shuman, 1975;Msaky & Calvet, 1990;Bibak, 1997;Yuan & Lavkulich, 1997;Mesquita, 1998), pouquíssimos têm-se dedicado ao processo reverso: dessorção desses elementos, sendo inexistentes na literatura consultada estudos sobre dessorção de manganês. Como observado por Swift & McLaren (1991), tal situação é paradoxal, uma vez que a dessorção constitui o processo que controla a concentração e a taxa de fornecimento dos micronutrientes para a solução do solo.…”

Section: Introductionunclassified