Apatite is a highly insoluble Ca-phosphate compound with the general formula of Ca 10 (PO 4) 6 X 2, where X is F − (fluoroapatite), OH − (hydroxyapatite), or Cl − (chloroapatite). In highly weathered, acidic soils, little or none of these apatite minerals remain in the soil.
Get Priceto determine if the apatite material could be used in permeable reactive barrier systems or canister type configurations for removal of uranium and cadmium from contaminated groundwater. Most recently we have begun studies to determine if apatite can be added in a soil-mixing scenario to remove metals from contaminated soils. MATERIALS AND METHODS
[PDF]Get PriceApatite, an inorganic phosphate mineral, has been ap- plied to facilitate the immobilization of several toxic metals including Cu, Zn and Pb [10-12]. For example, apatite amendments have a long remedial history at met- als contaminated soils sites [10,13,14]. Apatite's use in sediment remediation is more recent [15]. The DoD * Corresponding ...
Get PricePIMS: an Apatite II Permeable Reactive Barrier to Remediate Groundwater Containing Zn, Pb and Cd JUDITH WRIGHT1, BRYONY HANSEN2, and JAMES CONCA3 1PIMS NW, Inc., 201 N. Edison, Kennewick, WA 99336, [email protected]; 2Golder Associates, 1200 W.
SPECIATION AND REACTIVITY OF PHOSPHORUS AND ARSENIC IN MID-ATLANTIC SOILS by ... control soils.....87 Table 4.2. Mehlich-3 extractable element concentrations for former orchard soils and ... associated PO4 (c) and apatite (d) (corresponding XRF map not shown
Get PriceJul 26, 2016 · The particle size of apatite is one of the critical factors that influence the adsorption of heavy metals on apatite in the remediation of heavy metal contaminated soils using apatite. However, little research has been done evaluating the impact of different particle sizes of apatite on ...
Get PriceNov 01, 2004 · Read "Formation of hydroxyapatite in soils using calcium citrate and sodium phosphate for control of strontium migration, Radiochimica Acta" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
[PDF]Get PriceWhile weathering of apatite and eolian erosion control P amounts on less weathered and arid soils, leaching and biological uplift become increasingly important with increasing soil weathering status. On very weathered sites, leaching becomes the dominant process controlling P amounts, though it is partially counteracted by biological uptake and ...
[PDF]Get PricePhosphorus (P) in runoff can pose a water quality risk in phosphate mine reclamation areas. High dissolved P (DP) concentrations (about 0.4-3.0 mg L-1) in runoff from these areas and high equilibrium P concentrations for the soils led us to hypothesize that P release is controlled by dissolution of apatite rather than by desorption mechanisms.
USE OF APATITE FOR CHEMICAL STABILIZATION OF SUBSURFACE CONTAMINANTS . FINAL REPORT . Work Performed Under Contract: DE-AC26-01NT41306 . ... 4.7.4.1 Characterization of the Microbial Populations Induced in Apatite-Amended Soil Column 31.3 : ... Elution of Select Metals from Soil Column 12-1 (control, with no Apatite Added). 57. Elution of ...
Get PriceStart studying Soil Fertility: Phosphorus (Lecture 1). Learn vocabulary, terms, and more with flashcards, games, and other study tools.
Get PriceThe sorption of aqueous Pb, Cd, and Zn onto a mineral apatite from North Carolina was investigated in relation to a wide range of pH. The effects of pH on solid-phase precipitation were particularly emphasized. The heavy metals were applied as single or multiple species. Solution pH greatly affected metal sorption mechanism by apatite and metal−apatite reaction products.
[PDF]Get PriceInorganic amend- apatite amendments have a long remedial history at met- ments help to immobilize several toxic metals such as als contaminated soils sites [10,13,14]. Apatite's use in lead, zinc, and cadmium by forming stable compounds sediment remediation is more recent [15].
Get PriceFungal biomass in the soil and control bags did not differ significantly among stand types. In contrast, the degree of fungal colonization in apatite- and wollastonite-amended bags varied significantly, suggesting that microbial response was due to tree species, type of mycorrhizal fungi, nutrient status of the soils, and mineral composition of ...
Get PriceInorganic amend- apatite amendments have a long remedial history at met- ments help to immobilize several toxic metals such as als contaminated soils sites [10,13,14]. Apatite's use in lead, zinc, and cadmium by forming stable compounds sediment remediation is more recent [15].
Get PriceIn particular, the apatite was able to reduce the metal concentrations in the TCLP-extracted soil leachates to below US EPA maximum allowable levels, suggesting that apatite could be used as a cost-effective option to remediating metal-contaminated soils, wastes, and/or water.
[PDF]Get PriceMost recently we have begun studies to determine if apatite can be added in a soil-mixing scenario to remove metals from contaminated soils. MATERIALS AND METHODS Low Ionic Strength Column Study. ... Uranium is measured as total U in unfiltered samples by ICP-MS. Port 1 of Array 1 is located after the control, sand/0% apatite column.
Get Price• Phosphorus in sand tailings soils at the sites was in the form of apatite, as indicated by x-ray diffraction (XRD) and chemical fractionation. Results of this study supported the hypothesis that release of P from the soil was primarily from apatite dissolution rather than desorption from metal oxides that is more typical of soil of the region.
Get PriceControl soil + Pb-acetate + apatite 17.1 Blood-Pb concentrations in rats and pigs (ug dL-1) From Traina et al., 1996 Treatment Rat Pig Control 0 16.3 Pb acetate--Pb(COOCH3)2 20.8 Pyromorphite—Pb5(PO4)3OH 0.1 Contaminated soil 3.7 Contaminated soil + apatite-Ca5(PO4)3OH 0.9
[PDF]Get PriceTime-resolved in situ studies of apatite formation in aqueous solutions ... of precursors to apatite may ultimately control the efficiency of the sequestration and stabilization. To date, efforts to characterize crystallization pathways (in ... conditions similar to those found in soils .
