Adsorption-desorption behaviors of Pb and Cd in Lake Chapala, Mexico

Hansen, Anne M.; Maya, Patricio

doi:10.1016/s0160-4120(97)00062-7

Cited by 20 publications

(20 citation statements)

References 3 publications

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“…Some researchers have suggested that high affinity Pb and Cd sorption sites in soils and sediments may be different (Hansen and Maya, 1997;Pardo, 2000). However, our data suggest that Pb and Cd probably compete for many of the same high affinity sites (Serrano et al, 2005).…”

Section: Sites Of CD and Pb Retentioncontrasting

confidence: 60%

“…Competitive sorption was observed between Cd and Ca as the number of sorption sites was more limited in this soil. Differences between soil colloid affinity for Pb compared to Ca were also detected (Hansen and Maya, 1997). Benjamin and Leckie (1981a,b) and Serrano et al (2005) observed similar behavior in their studies looking at the com petitive adsorption of Cd and Pb.…”

Section: Pb CD and Ca Interactionsmentioning

confidence: 60%

“…In a study investigating the ex tractability of mineral soil-sorbed Cu, Cd, Pb, and Zn with 1 M CaCl 2 , Sastre et al (2006) reported that much of the sorbed Cd was exchangeable (>51%) while the exchangeable Pb fraction was only 2.6e48% of the sorbed amount. Hansen and Maya (1997) also reported �90% of added Pb sorbed to suspended sediments in the presence of CaCl 2 (I ¼ 0.05 M), while �70% of the added Cd was sorbed under the same conditions.…”

Section: Pb CD and Ca Interactionsmentioning

confidence: 78%

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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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Section: Sites Of CD and Pb Retentioncontrasting

confidence: 60%

Section: Pb CD and Ca Interactionsmentioning

confidence: 60%

Section: Pb CD and Ca Interactionsmentioning

confidence: 78%

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Sequential sorption of lead and cadmium in three tropical soils

Appel

Lena

Rhue

et al. 2008

Environmental Pollution

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“…Cadmium is one of the most common contaminants in industrial regions, and is relatively mobile in aquatic systems, existing as free ionic cadmium, hydroxides, carbonates, and various other organic and inorganic complexes (Hunter et al, 1999;Hansen and Maya, 1997). The affinity of ligands to associate with cadmium follows the sequence: carbonates > hydroxides > chlorides > sulfates (Moore, 1990).…”

Section: Introductionmentioning

confidence: 99%

“…It has been reported that large-scale desorption occurs as rivers mix with salty water (Comans and van Dijk, 1988), indicating that dissolved chlorides and other major anions compete for cadmium and, thereby, reduce adsorption on sediment particles. Water hardness-related ions (calcium and magnesium) may also reduce adsorption of cadmium by competing with cadmium ions for sediment adsorption sites (Hansen and Maya, 1997). Besides the interactions with inorganic ions, cadmium also associates with natural organic matter (NOM) in aquatic systems (EPA, 2001;Xue and Sigg, 1998).…”

Section: Introductionmentioning

confidence: 99%

Modeling cadmium concentration in water of Lake Chapala, Mexico

Hansen

Afferden

2004

Aquat. Sci.

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Watershed management in Mexico is generally carried out based on hydrological information, whereas water quality data are mainly used in the control of wastewater discharges and water uses. Information on toxic contaminants is scarce and expensive to gather. A method was developed to predict inorganic contaminant concentration in Lake Chapala, Mexico, by using hydrological data for water balance, water quality information and analyses, sediment quality monitoring data, and ap- Aquatic Sciencesplying a chemical equilibrium model to estimate the possibility of increase in cadmium concentration. It is shown that decreasing water levels in Lake Chapala can lead to a significant increase in dissolved cadmium that, in the future, may affect the lake ecosystem and the water quality for different uses. Watershed managers can use this method with one by van Afferden and Hansen (2004) as an early warning system to reduce the risk that contaminant concentrations increase in the lake.

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Toxic Substances

Hansen

Afferden

2001

The Lerma-Chapala Watershed

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Adsorption-desorption behaviors of Pb and Cd in Lake Chapala, Mexico

Cited by 20 publications

References 3 publications

Sequential sorption of lead and cadmium in three tropical soils

Sequential sorption of lead and cadmium in three tropical soils

Modeling cadmium concentration in water of Lake Chapala, Mexico

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