Solubility Behavior of Calcium Carbonate and Other Divalent Metal Carbonates in Closed and Open Systems

2019 ◽  
pp. 245-260
Author(s):  
James F. Pankow
Keyword(s):  
Calcium Carbonate ◽  
Open Systems ◽  
Divalent Metal ◽  
Solubility Behavior ◽  
Metal Carbonates

Lattice mechanics of divalent-metal carbonates

1988 ◽  
Vol 37 (6) ◽  
pp. 3089-3092 ◽  
Author(s):  
R. K. Singh ◽  
N. K. Gaur ◽  
S. L. Chaplot
Keyword(s):  
Divalent Metal ◽  
Metal Carbonates ◽  
Lattice Mechanics

Oxygen Isotope Fractionation in Divalent Metal Carbonates

1969 ◽  
Vol 51 (12) ◽  
pp. 5547-5558 ◽  
Author(s):  
James R. O'Neil ◽  
Robert N. Clayton ◽  
Toshiko K. Mayeda
Keyword(s):  
Oxygen Isotope ◽  
Isotope Fractionation ◽  
Divalent Metal ◽  
Oxygen Isotope Fractionation ◽  
Metal Carbonates

QUANTUM CHEMICAL STUDY ON THERMAL DECOMPOSITION MECHANISM OF CALCIUM CARBONATE

2013 ◽  
Vol 12 (06) ◽  
pp. 1350049 ◽  
Author(s):  
ZHEN ZHAO ◽  
DI WANG ◽  
QI WANG ◽  
ZHI LI ◽  
ZHIGANG FANG
Keyword(s):  
Thermal Decomposition ◽  
Calcium Carbonate ◽  
Quantum Chemical ◽  
Molecular Level ◽  
Quantum Chemical Study ◽  
Chemical Study ◽  
Thermal Decomposition Mechanism ◽  
Theoretical Studies ◽  
Chemical Calculation ◽  
Metal Carbonates

A detailed quantum chemical calculation is performed at the MP2(full)/6-311G* level to explore the mechanism of calcium carbonate thermal decomposition. Four microscopic pathways are identified. The rate constants of rate-determining steps in four pathways are calculated over a temperature range 298–1200 K. The calculating results show that only path A (R( CaCO 3) → IM 1 → P( CaO + CO 2)) and path B (R( CaCO 3) → IM B1 → IM B2 → P( CaO + CO 2) have contributions to the CaCO 3 thermal decomposition, and path A may be more favorable than path B. The present theoretical studies may provide useful information in understanding reaction mechanism of metal carbonates at the molecular level.

scholarly journals Carbonate-coordinated metal complexes precede the formation of liquid amorphous mineral emulsions of divalent metal carbonates

Nanoscale ◽  
2011 ◽  
Vol 3 (3) ◽  
pp. 1158 ◽  
Author(s):  
Stephan E. Wolf ◽  
Lars Müller ◽  
Raul Barrea ◽  
Christopher J. Kampf ◽  
Jork Leiterer ◽  
...  
Keyword(s):  
Metal Complexes ◽  
Divalent Metal ◽  
Metal Carbonates

A new formation process for calcic pendants from Pahranagat Valley, Nevada, USA, and implication for dating Quaternary landforms

2005 ◽  
Vol 63 (3) ◽  
pp. 359-367 ◽  
Author(s):  
Amy L. Brock ◽  
Brenda J. Buck
Keyword(s):  
Calcium Carbonate ◽  
Formation Process ◽  
Open Systems ◽  
Chemical Changes ◽  
New Interpretation ◽  
New Formation

It has been assumed that soil pendants form in a similar manner as stalactites, in which innermost laminae are the oldest and outer laminae are the youngest. This study presents a new interpretation for soil pendant development. Pahranagat Valley, Nevada, pendants contain features indicating continued precipitation through time at the clast–pendant contact, implying that the oldest deposits are not always found at the pendant–clast contact, as other studies have assumed. These features include a void at the clast–pendant contact where minerals such as calcium carbonate, silica, and/or fibrous silicate clays precipitate. In addition, fragments of the parent clast and detrital grains are incorporated into the pendant and are displaced and/or dissolved and result in the formation of sepiolite. This study indicates that pendants are complex, open systems that during and after their formation undergo chemical changes that complicate their usefulness for dating and paleoenvironmental analyses.

scholarly journals Procedure for Calculating the Calcium Carbonate Precipitation Potential (CCPP) in Drinking Water Supply: Importance of Temperature, Ionic Species and Open/Closed System

Water ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 42
Author(s):  
Camilla Tang ◽  
Berit Godskesen ◽  
Henrik Aktor ◽  
Marlies van Rijn ◽  
John B. Kristensen ◽  
...  
Keyword(s):  
Drinking Water ◽  
Calcium Carbonate ◽  
Open Source Software ◽  
Open Systems ◽  
Ionic Species ◽  
Water Systems ◽  
Carbonate Precipitation ◽  
Calcium Carbonate Precipitation ◽  
Closed Systems ◽  
Drinking Water Systems

The calcium carbonate (CaCO3) precipitation potential (CCPP) can predict the potential for corrosion and lime scaling in drinking water systems. CCPP can be calculated by different standards, but none of these consider all of the conditions in drinking water systems where temperatures can reach 100 °C and the water exchanges CO2 with the atmosphere. We provided and demonstrated a procedure for CCPP calculations using the open-source software PHREEQC with the phreeqc.dat database at temperatures relevant for drinking water systems (10–90 °C) and for open systems in equilibrium with atmospheric CO2. CCPP increased by 0.17–1.51 mmol/kg when the temperature was increased from 10 °C to 90 °C and increased by 0.22–2.82 mmol/kg when going from closed to open systems at 10 °C. Thus, CaCO3 precipitation may be underestimated if CCPP is only considered for the lower sample temperature and for closed systems. On the other hand, CCPP10 decreased by 0.006–0.173 mmol/kg when including the ionic species from the German DIN 38404-10 standard in addition to calcium, alkalinity and pH, indicating that all relevant ionic species should be included in CCPP calculations. CCPP values should always be reported with the calculation procedure and temperature to avoid inconsistency in literature.

Sign in / Sign up

Export Citation Format

Share Document