Reevaluating the free-ion activity model of trace metal availability to higher plants

Parker, David R.; Pedler, Judith F.

doi:10.1007/978-94-009-0047-9_19

Cited by 54 publications

(51 citation statements)

References 12 publications

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“…This indeed is the primary exposure route of plants, microorganisms and soft-bodied organisms to TEs, while soil-ingesting invertebrates are exposed to TEs that are associated with the soil solid phase. Nevertheless, it has been suggested that the dissolved TEs are most readily available to soil biota, including plants (for example [107,108] recognition as a means of assessing the bioavailability and toxicity of TEs in soils (for example [109][110][111]). Within soil solution TEs occur in a variety of chemical forms, for example free hydrated ions, complexed with a wide range of naturally occurring organic (humic substances, phyto-and bacterial siderophores, and low-molecular-mass organic acids) and inorganic ligands and bound to colloidal material.…”

Section: Soil Solution Concentration and Speciationmentioning

confidence: 99%

Assessing Bioavailability of Soil Trace Elements

Hooda

2010

Trace Elements in Soils

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Section: Soil Solution Concentration and Speciationmentioning

confidence: 99%

Assessing Bioavailability of Soil Trace Elements

Hooda

2010

Trace Elements in Soils

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“…This is because heavy metals in a soil solution constitute the soil metal fraction that is most directly available for plant uptake and could potentially be leached from the soil and contaminate groundwater or surface water. Many authors have shown that the activity of metal ions in the soil solution is a key factor in determination of element bioavailability and its toxicity for various organisms (Cancés et al 2003;Degryse et al 2009;Parker and Pedler 1996;Weng et al 2001). The concentration and activity of zinc in the soil solution depends on the physical and chemical properties of the soil (Ivezić et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Soil factors affecting solubility and mobility of zinc in contaminated soils

Rutkowska

Szulc

Bomze

et al. 2014

Int. J. Environ. Sci. Technol.

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In view of modern worldwide research carried out in the context of broadly understood soil chemistry and monitoring of the natural environment, the methods of assessing the risk of Zn contamination in soil and agricultural crops based on the analyses of Zn concentration in the soil solution have gained more recognition. Accordingly, research on the evaluation of the effects of selected soil properties on changes in solid/solution partitioning coefficient (K d ), the total concentration and activity of zinc in the soil solution was undertaken in this study. The study was based on the microplot field experiment. Investigated soil factors were as follows: soil texture, pH, organic carbon content and the degree of Zn contamination. The results indicated that zinc activity in the soil solutions was very high and comparable to the total concentration of zinc. The investigated soil properties significantly influenced the K d , the total concentration of zinc, as well as the concentration of Zn 2? in the soil solution. The total concentration and activity of zinc in the soil solution increased with increasing Zn content in the soil and rising soil acidity, while they decreased with increasing the content of organic carbon and clay particles. The values of K d increased significantly with rising soil pH and total Zn content and decreased with increasing soil organic content. Observed K d values were significantly higher in soil with 13 % clay than in soil with 7 % clay.

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“…These effects are closely related to the biological availability of heavy metals, which in turn are controlled by the metal ion speciation in the soil (Davis et al, 1992;Katbata-Pendias, 1993;Alloway, 1995). Metals exist in a number of different soluble and particulate forms, which influence their mobility and bioavailability (Ge et al, 2005), and free metal activity has been shown to be the key factor in determining metal bioavailability and toxicity in most circumstance (Parker and Pedler, 1996;Weng et al, 2001a;Cancès et al, 2003). Therefore, measuring of free metal ion concentrations in soil solution becomes important.…”

Section: Introductionmentioning

confidence: 99%

Determination of free heavy metal ion concentrations in soils around a cadmium rich zinc deposit

Yan

Wang

et al. 2007

Geochem. J.

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The study of heavy metal speciation is of interest for the evaluation of their ecotoxicological risk. Free heavy metal ion concentrations of Cu 2+ , Zn 2+ , Ni 2+ and Cd 2+ were studied at different soil to soil solution ratio (SSR) to discuss metal bioavailability and toxicity in circumstance. The samples were collected from two farmed soils, impacted by a cadmium rich zinc deposit, Guizhou, China. One is near a bridge (QBT for short), which is 15 km away from smelter and is regarded as polluted by fly ash from smelter, the other is located 300 m away from a smelting factory (BXT for short), and it is polluted badly by waste water from smelter. To determine the free heavy metal ion concentration, Donnan Membrane Technique (DMT) and ECOSAT program were used. The concentrations of free copper and zinc ions in QBT and all studied metal ions in BXT were nearly in direct ratio with the soil to soil solution ratio, and they increased with the increasing of SSR. The variational trends of the concentrations of free nickel and cadmium ions in QBT were contrary to those of copper and zinc ions. The measured and predicted results were compared and they agreed with each other. Individual sorbents contribution to metal binding was also predicted. The results suggest soil organic matter is the most important sorbents in the two soils, and hydrous ferric oxide takes the second place.

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Reevaluating the free-ion activity model of trace metal availability to higher plants

Cited by 54 publications

References 12 publications

Assessing Bioavailability of Soil Trace Elements

Assessing Bioavailability of Soil Trace Elements

Soil factors affecting solubility and mobility of zinc in contaminated soils

Determination of free heavy metal ion concentrations in soils around a cadmium rich zinc deposit

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