Spectroscopic and Modeling Study of Lead Adsorption and Precipitation Reactions on a Mineral Soil

Nguyen, Quoc Tuan; Manning, Bruce A.; Cai, Yaqi; Braids, O. C.

doi:10.1021/bk-2003-0835.ch025

Cited by 3 publications

(4 citation statements)

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“…Lead sulfate (PbSO 4 ) was found in these contaminated forest soils (concentrations up to 35,300 mg kg −1 ) by X-ray powder diffraction. Also, Nguyen and Manning (2003) used X-ray absorption spectroscopy on a predominantly inorganic, mineral soil (fine-loamy, thermic, Typic Haploxeralf, Fallbrook series) and determined that the adsorption of Pb is strongly pH dependent. Lead removal mechanisms from solution included adsorption primarily on inorganic mineral surfaces and probably precipitation of Pb(OH) 2 at pH>5.5.…”

Section: Resultsmentioning

confidence: 99%

Lead forms in urban turfgrass and forest soils as related to organic matter content and pH

Yesilonis

James

Pouyat

et al. 2007

Environ Monit Assess

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Soil pH may influence speciation and extractability of Pb, depending on type of vegetation in urban soil environments. We investigated the relationship between soil pH and Pb extractability at forest and turf grass sites in Baltimore, Maryland. Our two hypotheses were: (1) due to lower pH values in forest soils, more Pb will be in exchangeable forms in forested than in turfgrass soils and (2) due to the greater lability of exchangeable Pb in equilibrium with soil solution in forest soils, concentrations of this form will increase with depth more so than in the turfgrass soils, as related to organic matter content and pH. Soil samples were collected from three forested and three turfgrass sites to depths of 20 cm. Lead forms were determined using a sequential extraction technique. Soils under turfgrass and forest vegetation differed in the extractability of soil Pb (P < 0.01) for the Mn(III, IV)- and Fe(III)(hydr) oxide fraction. A greater Pb concentration was bound to this fraction under turfgrass (211 mg kg(-1), 69% of total Pb) than forested soils (67 mg kg(-1), 61% of total Pb), perhaps due to soil pH differences of 5.9 and 5.0, respectively. In the forested soils, as depth increased, the ratio of exchangeable-to-total Pb increased and the ratio of organically bound Pb-to-total Pb decreased. The results suggest changes in pH and organic matter content with depth affect the extractability of Pb, and these soil properties are affected differentially by grass versus tree vegetation in the urban soils investigated.

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Section: Resultsmentioning

confidence: 99%

Lead forms in urban turfgrass and forest soils as related to organic matter content and pH

Yesilonis

James

Pouyat

et al. 2007

Environ Monit Assess

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“…A range of Pb reference compounds representing the most common Pb species reported in aerosol particles, − soils, − , street dust, and Pb-based paints , were purchased or synthesized for XAFS modeling and included the following: Pb oxides (PbO, massicot; β-PbO 2 , plattnerite), galena (PbS), Pb metal, Pb sulfate [mixture of lanarkite (Pb 2 O(SO 4 )) and anglesite (PbSO 4 )], cerussite (PbCO 3 ), hydrocerussite ((PbCO 3 ) 2 •Pb(OH) 2 ), crocoite (PbCrO 4 ), pyromorphite (Pb 5 (PO 4 ) 3 Cl), Pb acetate, Pb citrate, Pb oxalate, Pb adsorbed onto goethite (350 mmol/kg; pH 6.5), birnessite (300 mmol/kg; pH 6.5), and gibbsite (300 mmol/kg; pH 6.5) (as representative species on Pb associated to Fe-, Mn-, or Al-oxyhydroxides), Pb adsorbed on cysteine, and Pb complexed to humic acid (300 mmol/kg; pH 5). Details on the source of Pb standards, sample preparation, beamline parameters, and data analysis are given in Appendix A (SI).…”

Section: Methodsmentioning

confidence: 99%

“…In this study we investigate the speciation of Pb in house dust containing elevated Pb concentrations (>1000 mg kg –1 ) using bulk X-ray absorption fine structure spectroscopy (XAFS), micro-XRF, and micro-XRD. Numerous studies have applied XAFS spectroscopy to determine Pb speciation in a variety of environments, including aerosol particles, − soils, − and street dust . However, there are comparatively few XAFS studies on Pb speciation in household dust. − For the detailed characterization of Pb speciation related to potential childhood exposures, dust Pb samples were selected for the present study from a nationally representative data set of 1025 homes sampled in the Canadian House Dust Study .…”

Section: Introductionmentioning

confidence: 99%

Lead Speciation in House Dust from Canadian Urban Homes Using EXAFS, Micro-XRF, and Micro-XRD

MacLean

Beauchemin

Rasmussen

2011

Environ. Sci. Technol.

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X-ray absorption fine-structure (XAFS) spectroscopy, micro-X-ray fluorescence (μXRF), and micro-X-ray diffraction (μXRD) were used to determine the speciation of Pb in house dust samples from four Canadian urban homes having elevated Pb concentrations (>1000 mg Pb kg(-1)). Linear combination fitting of the XAFS data, supported by μXRF and μXRD, shows that Pb is complexed in a variety of molecular environments, associated with both the inorganic and organic fractions of the dust samples. The inorganic species of lead identified were as follows: Pb metal, Pb carbonate, Pb hydroxyl carbonate, Pb oxide, and Pb adsorbed to iron oxyhydroxides. Pb carbonate and/or Pb hydroxyl carbonate occurred in all four dust samples and accounted for 28 to 75% of total Pb. Pb citrate and Pb bound to humate were the organic species identified. The results of this study demonstrate the ability of XAFS to identify Pb speciation in house dust and show the potential to identify Pb sources from new homes versus older homes. Understanding Pb speciation and how it influences bioaccessibility is important for human health risk assessment and risk management decisions which aim to improve indoor environmental health.

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“…(Sparks, 2000). 그러나, Pb ... Pb 중합체(polymer)를 형성하는 것은 관찰되었고 (Roe et al, 1991;Elzinga and Sparks, 2002;Gräfe et al, 2007) 결정도가 낮은 수산화물 침전체의 형성 가능성 도 제기되었다 (Nguyen and Manning, 2003). 탄산염 광물 표면이나 인산염 광물 표면에서 Pb 2+ 는 광물을 Fig.…”

Section: 금속이온이 음이온과 함께 공존하면서 수착된다면unclassified

Chemical Properties of Mineral Surfaces and Metal Ion Sorption: A Review

Yoon¹

2012

Economic and Environmental Geology

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Metal ions, toxic or potentially toxic to biota and human beings, can be immobilized by sorption onto the mineral surfaces in soils and sediments. This article briefly explains theories regarding the chemical properties of mineral surfaces to sorb metal ions and processes of extended X-ray absorption fine structure (EXAFS) analysis for sorption study, and reviews atomic-scale findings on metal sorption on mineral surfaces. The theoretical understanding on the chemistry of mineral surfaces and metal sorption is fundamental to the proper analysis of the atomicscale spectroscopy to determine the sorption phases. Atomic-scale findings on metal sorption phases discussed here include co-precipitation, ternary complexation, aging effects, and desorption possibilities, as well as outer-sphere complexation, inner-sphere complexation, and surface precipitation.

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Spectroscopic and Modeling Study of Lead Adsorption and Precipitation Reactions on a Mineral Soil

Cited by 3 publications

References 0 publications

Lead forms in urban turfgrass and forest soils as related to organic matter content and pH

Lead forms in urban turfgrass and forest soils as related to organic matter content and pH

Lead Speciation in House Dust from Canadian Urban Homes Using EXAFS, Micro-XRF, and Micro-XRD

Chemical Properties of Mineral Surfaces and Metal Ion Sorption: A Review

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