Solubility of pyromorphite Pb5(PO4)3Cl–mimetite Pb5(AsO4)3Cl solid solution series

Flis, J.; Manecki, Maciej; Bajda, Tomasz

doi:10.1016/j.gca.2011.01.021

Cited by 63 publications

(61 citation statements)

References 44 publications

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“…Consequently, this acidic soil condition could favour the mobility and availability of heavy metals in the soil (Cerqueira et al, 2011;Flis et al, 2011). FE-SEM with EDS is used to investigate the morphology, structural distribution, and chemical composition of samples containing ultrafine particles and minerals (crystalline and/or amorphous).…”

Section: Resultsmentioning

confidence: 99%

Fractionation of Pb in Soil of Abandoned Pb Mine by SEM-EDX and XRD

Bappah¹,

Haryna²

2015

Journal of Applied Sciences and Environmental Management

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ABSTRACT:Mining activity has been associated with environmental pollution problem all through ages. Rhandirmwyn Pb mine was one of the most important mine site areas in South Wales. At present, the mine waste and adits in the area are regarded as main sources of Pb pollution in the area. Therefore, scanning electron microscopy coupled with energy dispersive X-ray spectrometer (SEM-EDX) were used for the identification of fractional forms of Pb that are liable to leach out/down from the soil matrix of the abandoned mine site to surface-andunderground water bodies of the nearby localities, and to determine its association with soil components using X-ray diffraction (XRD). Among the fractional forms of Pb, Galena, Anglesite, Cerussite, Mimetite and Pyromorphite were identified as the fractions of Pb found in the soils of Nantymwyn (Rhandirmwyn) abandoned mine, of which Anglesite was the most abundant fraction observed. Being the most soluble fraction of Pb among the five Pb minerals observed dissolution of this fraction from the abandoned mine is highly possible and could be a source of contamination of soils and surface-and-ground water sources of localities in the vicinity of the spoil mines. However, results of XRD indicated that the bulk chemistry of the soil samples is dominated by quartz followed by aluminosilicates (comprise of illite and kaolinite and traces of pyrite, albite and orthoclase), all of which could be sink for Pb and could possibly influence the mobility of the metal.© JASEM http://dx.doi.org/10.4314/jasem/v19i3.9

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Section: Resultsmentioning

confidence: 99%

Fractionation of Pb in Soil of Abandoned Pb Mine by SEM-EDX and XRD

Bappah¹,

Haryna²

2015

Journal of Applied Sciences and Environmental Management

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“…In contrast, the shift in the Raman bands attributed to P-O vibrations was irregular; we could not determine the reason for this behavior. (a) (c) (V) (a) (c) (V) The IR spectra of apatites have been investigated by many authors [2,[18][19][20][21][22][23][24]. The most intense absorption bands observed in the spectra are derived from PO 4 and AsO 4 ( Figure 6).…”

Section: Characterization Of the Synthesis Productsmentioning

confidence: 99%

Transition from Endothermic to Exothermic Dissolution of Hydroxyapatite Ca5(PO4)3OH–Johnbaumite Ca5(AsO4)3OH Solid Solution Series at Temperatures Ranging from 5 to 65 °C

2018

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Abstract:Five crystalline members of the hydroxyapatite (HAP; Ca 5 (PO 4 ) 3 OH)-johnbaumite (JBM; Ca 5 (AsO 4 ) 3 OH) series were crystallized at alkaline pH from aqueous solutions and used in dissolution experiments at 5, 25, 45, and 65 • C. Equilibrium was established within three months. Dissolution was slightly incongruent, particularly at the high-P end of the series. For the first time, the Gibbs free energy of formation ∆G

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“…Some studies also demonstrated that pyromorphite formation is favored when H 2 PO 4 À is present and the pH ranges from 3 to 5 (Scheckel et al, 2013). Pyromorphite is the most stable form of Pb 2þ in the environment (Flis et al, 2011;Xie and Giammar, 2007). The formation of pyromorphite can significantly reduce Pb bioavailability and improve ecosystem health (Cao et al, 2002).…”

Section: Characterization Of the Precipitatesmentioning

confidence: 99%