The solubility of calcite and aragonite in sulfate-free seawater and the seeded growth kinetics and composition of the precipitates at 25°C

Mucci, Alfonso; Canuel, René; Zhong, Sheng

doi:10.1016/0009-2541(89)90040-5

Cited by 114 publications

(68 citation statements)

References 35 publications

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“…The seawater data show a slight tendency for increased precipitation rate at higher solution PCO 2 for a given saturation state, but variability in the data is too great to establish Error bars are the same as described in Fig. 3 Burton and Walter (1987) this relationship with statistical certainty. Reaction orders and rate constants for natural seawater data (Burton 1988), artificial seawater data (Burton 1988;Mucci et al 1989), and SO 4 -free artificial seawater data (Mucci et al 1989) are similar to values in dilute solution and show no dependence on solution PCO 2 for a range of values between 0.03 and 10.0% (Table 4). Reaction order is highest and rate constant is lowest for the 0.03% solution PCO 2 data from Burton, but the values are strongly influenced by two data points with anomalously low precipitation rates.…”

Section: Precipitation Kinetics At 25°cmentioning

confidence: 60%

Aragonite Kinetics in Dilute Solutions

2011

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Aragonite was synthesized inorganically using a seeded-growth technique to characterize precipitation kinetics for the heterogeneous growth of solid from dilute solutions (ionic strength: 0.05-0.07 mol l -1 ). The concentration of all aqueous constituents, including Ca (*5-15 mmol l -1 ), Na (*10-35 mmol l -1 ), Cl (*30-35 mmol l -1 ), and carbon (as total alkalinity: *10 to 17 meq l -1 ), was held constant by the addition of titrants that contained excess solute concentrations to balance the growth of solid phase during the precipitation reaction, and a CO 2 /N 2 gas mixture (0.009-0.178) was bubbled through each solution to facilitate mass exchange between gaseous and aqueous carbon species. Forty-three experiments were conducted at 10°(n = 13), 25°(n = 21), and 40°C (n = 9), over a range of average saturation states with respect to aragonite from 8.3 to 28.5, 2.9 to 19.6 and 2.0 to 12.2, and average precipitation rates from 10 2.8 to 10 3.8 , 10 2.3 to 10 4.0 , and 10 2.5 to 10 4.1 micromol m -2 h -1 , respectively. Reaction orders averaged 1.7 ± 0.10 at 10°, 1.7 ± 0.07 at 25°and 1.5 ± 0.06 at 40°, and they were independent of temperature while rate constants averaged 10 1.3 ± 0.12, 10 1.9 ± 0.06, and 10 2.6 ± 0.04 micromol m -2 h -1 , respectively, increasing one-half order of magnitude for each 15°C rise in temperature. From these data, an Arrhenius activation energy of 71.2 kJ mol -1 is calculated for the heterogeneous precipitation of aragonite. This value is comparable to a sole independent measurement of 80.7 kJ mol -1 reported for the solid-solution recrystallization of monohydrocalcite to aragonite (Munemoto and Fukushi in J Mineral Petrol Sci 103: 345-349, 2008).

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Section: Precipitation Kinetics At 25°cmentioning

confidence: 60%

Aragonite Kinetics in Dilute Solutions

2011

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“…Both are considered to provide serviceable paleothermometers (hanSen klünder & others, 2008). Analyses of these Me/Ca ratios of bivalve shells and hard parts of other organisms were complemented by inorganic precipitation experiments (kinSMan & holland, 1969;Mucci, canuel, & Zhong, 1989). With increasing temperature, Sr/Ca and Mg/Ca ratios of abiogenic aragonite decreases (kinSMan & holland, 1969;gaeTani & cohen, 2006), whereas those of abiogenic calcite increase (kinSMan & holland, 1969).…”

Section: Minor Trace and Rare Earth Elementsmentioning

confidence: 99%

Treatise Online no. 46: Part N, Revised, Volume 1, Chapter 14: Bivalve sclerochronology and geochemistry

Schoene¹,

Surge²

2012

TREON

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“…From the dissolution side of the coin, it has been known for some time that Mg 2+ inhibits the dissolution rate of both calcite and aragonite (Sjöberg, 1978;Morse et al ., 1979) . The only other major seawater component that has been identified as a dissolution inhibitor is SO 4 2- (Sjöberg, 1978;Mucci et al ., 1989) . Of the minor components in seawater, phosphate ion, which is highly variable in concentration in the ocean, is the most notorious in inhibiting the dissolution rate of both calcite and aragonite (Berner and Morse, 1974;Walter and Burton, 1986) .…”

Section: Carbonate Dissolution and Precipitation In Marine Watersmentioning

confidence: 99%