Abstract
Artificially lead (Pb) contaminated soil was stabilised with hydrated lime and the leaching behaviour of the element was investigated. A 5 grams’ sample of contaminated soil was thoroughly mixed with 0.1g of lime, and The mixture containing 50 ml of leaching solution was shaken for 2hours, and then the solution was filtered using a Whatman Grade 540. filter paper. The extent of lead leaching, with and without the addition of lime, was determined after adjusting the solution pH between (1-12). More than 90% of the lead was retained when the pH was 12.0. Results from the analysis of X-ray photoelectron spectroscopy and Raman, on the soil samples retained on the filter paper, showed the formation of lead sulphate, lead oxide, and lead carbonate. which is in agreement with the analysis of X-ray diffraction and FTIR measurements.
Highlights
The use of stabilization/solidification technology for the immobilization of heavy metals in contaminated lands with various additives including cement, lime and fly ash has been reported [1], [2]
Results from the analysis of X-ray photoelectron spectroscopy and Raman, on the soil samples retained on the filter paper showed the formation of lead sulphate, lead oxide and lead carbonate. which is in agreement with the analysis of X-ray diffraction and FTIR measurements
Whilst taking the measurements using Raman instrumentation it was considered in this study to increase the concentration of lead in the soils or as solution to 20,000mg/l in order to enable the Raman instrument to detect the lead in the samples
Summary
The use of stabilization/solidification technology for the immobilization of heavy metals in contaminated lands with various additives including cement, lime and fly ash has been reported [1], [2]. Mickney et al [3] reported that the use of lime in contaminated soil reduces the solubility of toxic metals and reduces the moisture content of the soil. The US Environmental Protection Agency(USEPA) recognizes cementitious solidification as the “best demonstrated available technology (BDAT)” for land disposal of most toxic elements. Alkaline matrices such as Ca(OH) and cement are commonly used in waste conditioning because they are inexpensive, readily incorporate wet wastes and their alkalinity reduces the solubility of many inorganic toxic or hazardous metals. We report on investigations in which hydrated lime has been used to stabilise lead contaminated soil
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