PMID: 16509350Mar 3, 2006Paper

Effect of strontium contaminants upon the size and solubility of calcite crystals precipitated by the bacterial hydrolysis of urea

Environmental Science & Technology
Andrew C Mitchell, F Grant Ferris

Abstract

The nucleation and growth of calcite precipitates induced by the bacterial hydrolysis of urea (ureolysis) from a Sr-contaminant inclusive, and a Sr-free artificial groundwater (AGW) mimicking the composition of the 90Sr contaminated Snake River Plain aquifer were investigated. Sr-free experiments exhibited a gradual increase in mean calcite crystal diameter (<1000 nm) from day (D) 1 to 6, while in the Sr-inclusive experiments, daily diameters were approximately constant from D1 to D6, and crystals were smaller (mean <840 nm). These data demonstrate a steady state had been attained early in the Sr-inclusive experiments from growth inhibition by Sr. Modeling of the crystal growth mechanisms on the USGS GALOPER software suggested crystal size distributions in the Sr-inclusive and Sr-free experiments were generated in the nucleation stage by a decreasing nucleation rate with surface-controlled growth, followed by supply-controlled and random growth. This occurred despite the availability of Ca2+ and HCO3-, implying crystal growth is limited bythe rate of solute advection to the crystal surface. Calculation of the solubility constant (In KsO(A)) demonstrates smaller crystals are more soluble, reflecting a higher molar surface area. ...Continue Reading

References

May 15, 2001·Journal of Colloid and Interface Science·Ivan Sondi, Egon Matijevic

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Citations

Jan 4, 2013·Environmental Science & Technology·Ellen G LauchnorRobin Gerlach
Jun 28, 2013·Biofouling·Adrienne J PhillipsLee Spangler
Jun 15, 2010·Environmental Science & Technology·Andrew C MitchellRobin Gerlach
Jul 20, 2021·Environmental Science & Technology·Charles M R GraddyDouglas C Nelson

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