Removal of heavy metal ions from aqueous solutions by alkaline-earth metal phosphates

Шашкова, И. Л.; Ратько, А. И.; Китикова, Н. В.

doi:10.1016/s0927-7757(99)00193-4

Cited by 66 publications

(25 citation statements)

References 13 publications

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“…The rapid loss of Mg can be explained by the higher ion-exchangeability of Mg-CaHAP compared to CaHAP due to the high specific surface area of the former (Yasukawa et al 2002). It results in a higher efficiency of metal removal (Shashkova et al 1999), in our case Fe and Mn being the most probable favorites. A similar trend was observed in the archaeological bones, which are also depleted in Mg relative to the modern ones (Pate et al 1989;Johnsson 1997).…”

Section: Magnesiummentioning

confidence: 73%

Compositional changes in fish scale hydroxylapatite during early diagenesis; an example from an abandoned meander

et al. 2009

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The chemistry of recent fish scales (tench, common carp, amur and European perch) and subrecent fish scales (European perch and mostly taxonomically not determined) was studied by means of laser ablation inductively coupled plasma mass spectrometry and electron microprobe from shallow boreholes in the abandoned meander Certak near Uherské Hradiste. A detailed study of subfossil fish confirms extremely rapid changes in the chemical composition of hydroxylapatite during very early diagenetic processes in the first 2 years, which does not change significantly in the bottom of the boreholes about 25 years old. While there is an enormous increase in Na, K, Ba and Sr, Fe and Mn, there is a major decrease in Mg. The fish scales from 70 to 78 cm (6-8 years old) are approaching already the level of francolite-type hydroxylapatite. The high Na content indicates carbonate substitutions for OH or PO 4 group. Consequently, environmental interpretations based on the chemistry of fossil hydroxylapatites require extreme caution. In recent fish scales, the element concentrations reflect not only the position in the trophic pyramid but also a complicated interplay of the diet, physiological processes and environmental contamination.

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Section: Magnesiummentioning

confidence: 73%

Compositional changes in fish scale hydroxylapatite during early diagenesis; an example from an abandoned meander

et al. 2009

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“…Synthetic HA is not the only form of calcium phosphate used in metal removal investigations [27,28]. Fish bones resulting from fishing waste have been studied as well as bone char and meat and bone meal calcination residues [29,30].…”

Section: The Various Ha Formsmentioning

confidence: 99%

Role of Phosphate in the Remediation and Reuse of Heavy Metal Polluted Wastes and Sites

Nzihou

Sharrock

2010

Waste Biomass Valor

111

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Heavy metal pollution is a major environmental concern because of the toxicity to humans and plants. This toxicity is lethal even in trace quantities and metals have a great tendency to bioaccumulate. The efficiency of phosphate and apatites M 10 (PO 4 ) 6 (OH) 2 , M: Metal, in particular, in removing and immobilizing heavy metals from wastewater, groundwater (as permeable reactive barriers for in situ site remediation), fly ash, dredged sludges and contaminated soil has led to various studies to understand and explain the mechanisms involved. This paper will address the use of apatite as sorbent and stabilizing agents for the removal of heavy metals from various media. Efficient physico-chemical immobilization of heavy metals brings new perspectives for reuse of polluted waste water, soils and land treated by selected phosphates.

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“…(2) The second mechanism involves ion exchange between Pb 2+ in solution and Ca 2+ on hydroxyapatite lattice (Suzuki et al 1981;Takeuchi and Arai 1990;Shashkova et al 1999). …”

Section: Different Sources Of P For Pb Immobilization In Soilsmentioning

confidence: 99%

Phosphates for Pb immobilization in soils: a review

2008

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In its soluble ionic forms, lead (Pb) is a toxic element occurring in waters and soils mainly as the result of human activities. The bioavailability of lead ions can be decreased by complexation with various materials in order to decrease their toxicity. Pb chemical immobilization using phosphate addition is a widely accepted technique to immobilize Pb from aqueous solution and contaminated soils. The application of different P amendments cause Pb in soils to shift from forms with high availability to the most strongly bound Pb fractions. The increase of Pb in the residual or insoluble fraction results from formation of pyromorphite Pb 5 (PO 4 ) 3 X where X = F, Cl, Br, OH, the most stable environmental Pb compounds under a wide range of pH and Eh natural conditions. Accidental pyromorphite ingestion does not yield bioavailable lead, because pyromorphite is insoluble in the intestinal tract. Numerous natural and synthetic phosphates materials have been used to immobilize Pb: apatite and hydroxyapatite, biological apatite, rock phosphate, soluble phosphate fertilizers such as monoammonium phosphate, diammonium phosphate, phosphoric acid, biosolids rich in P, phosphatic clay and mixtures. The identification of pyromorphite in phosphate amended soils has been carried out by different non destructive techniques such as X-ray diffraction, scanning electron microscopy coupled with energy dispersive X-ray spectroscopy, X-ray absorption fine structure, transmission electron microscopy and electron microprobe analysis. The effectiveness of in situ Pb immobilization has also been evaluated by selective sequential extraction, by the toxicity leaching procedure and by a physiologically based extraction procedure simulating metal ingestion and gastrointestinal bioavailability to humans. Efficient Pb immobilization using P amendments requires increasing the solubility of the phosphate phase and of the Pb species phase by inducing acid conditions. Although phosphorus addition seems to be highly effective, excess P in soil and its potential effect on eutrophication of surface water, and the possibility of As enhanced leaching remains a concern. The use of mixed treatments may be a useful strategy to improve their effectiveness in reducing lead phyto-and bioavailability.

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Removal of heavy metal ions from aqueous solutions by alkaline-earth metal phosphates

Cited by 66 publications

References 13 publications

Compositional changes in fish scale hydroxylapatite during early diagenesis; an example from an abandoned meander

Compositional changes in fish scale hydroxylapatite during early diagenesis; an example from an abandoned meander

Role of Phosphate in the Remediation and Reuse of Heavy Metal Polluted Wastes and Sites

Phosphates for Pb immobilization in soils: a review

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