Influence of phosphate on cadmium sorption by calcium carbonate

Thakur, S.K.; Tomar, N.K.; Pandeya, S.B.

doi:10.1016/j.geoderma.2005.01.026

Cited by 58 publications

(22 citation statements)

References 25 publications

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“…In waters it occurs in both dissolved and insoluble form, in organic and inorganic complexes, or as free ions (Meinelt et al, 2001 (Chen et al, 1997;Thakur et al, 2006). In strongly polluted river waters about 70% of the total Cd content is present in cationic form (Kabata-Pendias, 2000).…”

Section: Cadmiummentioning

confidence: 99%

The speciation and physico-chemical forms of metals in surface waters and sediments

Namieśnik

Rabajczyk

2010

Chemical Speciation & Bioavailability

143

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Surface waters can be contaminated in many ways, e.g., by solutions and suspended matter. Moreover, insoluble substances in colloidal form, in suspension or adsorbed on solid bodies can dissolve in response to changing physical and chemical conditions and become a secondary source of surface water pollution, thereby endangering wildlife. In addition, if we take into account varying rates of flow, contaminants can be transported over considerable distances. Hydrological processes, which determine factors, such as the rate of sedimentation, also influence the quality of surface waters; bottom sediments can contain large quantities of accumulated organic and inorganic compounds, including heavy metals. The physical and chemical properties of aquatic ecosystems are characterized by a number of interdependent parameters. Hence, factors such as temperature, oxygen content and pH of a water body can alter the solubility of the salts present in it, the forms of occurrence of particular species, as well as their bioavailability and toxicity. Thus it is necessary to determine the various species of metals present in the different compartments of the aquatic ecosystem.

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Section: Cadmiummentioning

confidence: 99%

The speciation and physico-chemical forms of metals in surface waters and sediments

Namieśnik

Rabajczyk

2010

Chemical Speciation & Bioavailability

143

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“…The amount of Cd adsorbed to soil particles must be reduced with PG amendment since it supplies Ca. Ca competes with Cd for sorption sites (Voegelin et al 2001;Thakur et al 2006) and, as a consequence, the amount Concentrations correspond to mean and standard deviation of mean (n=6 for biological matrices and n=4 for soils). RAF and TF estimated from means, with propagated errors.…”

Section: Analyte Concentrations In Soils and Vegetal Samplesmentioning

confidence: 99%

Transfer of Cd, Pb, Ra and U from Phosphogypsum Amended Soils to Tomato Plants

Enamorado

Abril

Mas

et al. 2009

Water Air Soil Pollut

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About 170 million tons of phosphogypsum (PG) are annually generated worldwide as a byproduct of phosphoric acid factories. Agricultural uses of PG could become the main sink for this waste, which usually contains significant radionuclide (from the 238 U-series) and toxic metals concentrations. To study PG effects on pollutant uptake by crops, a completely randomised greenhouse experiment was carried out growing Lycopersicum esculentum Mill L. on a reclaimed marsh soil amended with three PG rates (treatments), corresponding to zero (control without PG application), one, three and ten times the typical PG rates used in SW Spain (20 Mg ha −1 ). The concentrations of Cd, Pb, U (by inductively coupled plasma mass spectroscopy) and 226 Ra and 210 Po (by γ-spectrometry and α-counting, respectively) were determined in soil, vegetal tissue and draining water. Cadmium concentrations in fruit increased with PG rates, reaching 44±7 μg kg −1 formula weight with ten PG rates (being 50 μg kg −1 the maximum allowed concentration by EC 1881/2006 regulation). Cd transfer factors in non-edible parts were as high as 4.8± 0.5 (dry weight (d.w.)), two orders of magnitude higher than values found for lead, lead, uranium and radium concentrations in fruit remained below the corresponding detection limits-0.5 and 0.25 mg kg −1 and 0.6 mBq kg −1 , respectively (in a d.w. basis). 238 U (up to 7 μg kg −1 d.w.) and 210 Po (up to 0.74 Bq kg −1 d.w.) could be measured in some fruit samples by α-spectrometry. Overall, the concentrations of these metals and radionuclides in the draining water accounted for less than 1% of the amount applied with PG.

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“…However, a more general reason for investigating the influence of phosphate on metal sorption is the use of phosphate fertilizer, especially in relation to acid soils, to which it is often applied at high dosages in order to overcome the immobilization of phosphorus as insoluble ferric phosphates. The presence of phosphate can both favour the mobility of metal ions (McBride 1985;Thakur et al, 2006) and hinder it (Clark and McBride 1984); in the case of zinc, for example, phosphate increases or decreases mobility depending on whether its effect on soil acidity is to decrease or increase pH (Barrow 1987).…”

Section: Introductionmentioning

confidence: 99%