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Fluorite Precipitation in a Calcareous Soil Irrigated with High Fluoride Water

Tracy, P.W. and Robbins, C.W. and Lewis, G.D. (1984) Fluorite Precipitation in a Calcareous Soil Irrigated with High Fluoride Water. Soil Science Society of America Journal. 48(5):1013-1016.


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Lysimeters filled with Freedom silt loam soil (fine-silty, mixed, mesic, Xerollic Calciorthids) were irrigated with geothermal well water from south central Idaho. The water contained 7 mg F/L. Alfalfa (Medicago sativa L.) was grown in the lysimeters and the water was applied at a rate to give either a 0.30 or 0.15 leaching fraction. After irrigating the 1.0 m deep soil samples for 600 d, over 98% of the added F remained in the soil. Soil extract and lysimeter leachate analysis showed that fluorite precipitation was occurring in the upper profile, but only after another fluoride adsorption mechanism was saturated and the fluoride and calcium ion activities exceeded the CaF? ion activity product. The F concentration in the upper profile extracts exceeded 20 mg F/L and with the additional high F water irrigation, the soluble F would be expected to leach deeper in the soil. Under field conditions the F would be expected to eventually move into the groundwater with continued irrigation with high F water.

Item Type: Article
NWISRL Publication Number: 0529
Subjects: Soil > Calcareous soil
Mass Import - autoclassified (may be erroneous)
Depositing User: Dan Stieneke
Date Deposited: 20 Nov 2010 21:52
Last Modified: 13 Jan 2017 23:16
Item ID: 419

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