1996
DOI: 10.4141/cjss96-012
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Fluoride sorption and mineral stability in an Alberta soil interacting with phosphogypsum leachate

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Cited by 27 publications
(24 citation statements)
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“…High concentrations of soluble phosphate, sulfate, and fluoride were present in unreacted PW (Table 2). Over the pH range described in the present study, Ca activity may be controlled by fluorapatite (Ca 5 (PO 4 ) 3 F), gypsum (CaSO 4 2H 2 O), or fluorite (CaF 2 ) (Murray and Lewis 1985;Kennedy et al 1991;Ball 1994;Luther et al 1996). Other Ca compounds may have formed in conjunction with calcite and prevented calcite alone from controlling pH.…”
Section: Solid Phase Analysesmentioning
confidence: 99%
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“…High concentrations of soluble phosphate, sulfate, and fluoride were present in unreacted PW (Table 2). Over the pH range described in the present study, Ca activity may be controlled by fluorapatite (Ca 5 (PO 4 ) 3 F), gypsum (CaSO 4 2H 2 O), or fluorite (CaF 2 ) (Murray and Lewis 1985;Kennedy et al 1991;Ball 1994;Luther et al 1996). Other Ca compounds may have formed in conjunction with calcite and prevented calcite alone from controlling pH.…”
Section: Solid Phase Analysesmentioning
confidence: 99%
“…Fluoride concentrations decreased from 4700 to 18 mg L -1 , where they stabilized. Using a thermodynamically based geochemical model, Ball (1994) predicted CaF 2 controlled F solubility above pH 3.6; at lower pH values, aluminum complexes with F were hypothesized to control F. Luther et al (1996) repeatedly equilibrated PG leachate containing 31 mg F L -1 with calcareous and noncalcareous soils and reported that concentrations of 11 and 22 mg F L -1 persisted, respectively. Geochemical modeling predicted leachates were at or above saturation with respect to fluorite and fluorapatite for calcareous and noncalcareous soils, respectively.…”
Section: Total Soluble Fluoridementioning
confidence: 99%
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