Lead Immobilization from Aqueous Solutions and Contaminated Soils Using Phosphate Rocks

This research investigated the effectiveness of phosphate rocks in immobilizing Pb from aqueous solutions and contaminated soils. Different amounts of phosphate rocks were reacted with aqueous solutions containing Pb or with Pb-contaminated soils. The results show that phosphate rocks were effective...

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Bibliographic Details
Published in:Environmental science & technology 1995-04, Vol.29 (4), p.1118-1126
Main Authors: Ma, Qi Ying, Logan, Terry J, Traina, Samuel J
Format: Article
Language:English
Subjects:
AGUA
Aqueous solutions
CONTROL DE LA CONTAMINACION
EAU
FOSFATO MINERAL
Geology
IMMOBILISATION
IMMOBILIZATION
INMOVILIZACION
LEAD
LUTTE ANTIPOLLUTION
PHOSPHATE NATUREL
Phosphates
PLOMB
PLOMO
POLLUTED SOIL
POLLUTION CONTROL
POLLUTION DE L'EAU
POLLUTION DU SOL
POLUCION DEL AGUA
POLUCION DEL SUELO
ROCK PHOSPHATE
Soil contamination
SOIL POLLUTION
Soils
SOL POLLUE
SOLUCION
SOLUTION
SOLUTIONS
SUELO CONTAMINADO
WATER
WATER POLLUTION
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Summary:This research investigated the effectiveness of phosphate rocks in immobilizing Pb from aqueous solutions and contaminated soils. Different amounts of phosphate rocks were reacted with aqueous solutions containing Pb or with Pb-contaminated soils. The results show that phosphate rocks were effective in immobilizing Pb from aqueous solutions with a minimum Pb removal of 38.8-100%. The reaction time had less effect on Pb immobilization than the quantity of phosphate rocks used. Selected phosphate rocks reduced water-soluble Pb from a contaminated soil by 56.8-100%. The primary mechanism of Pb immobilization was via dissolution of phosphate rocks and precipitation of a fluoropyromorphite-like mineral. Different methods of mixing phosphate rocks and soil and incubation time had little effect on Pb immobilization. Our results strongly demonstrate that phosphate rocks may provide a cost-effective way to remediate Pb-contaminated water, soils, and wastes.
ISSN:0013-936X
1520-5851
DOI:10.1021/es00004a034