Film dissolution kinetics of aluminium at precisely adjusted pH-values

2016 ◽  
Vol 213 (6) ◽  
pp. 1410-1416
Author(s):  
Sarah Walkner ◽  
Martina Hafner ◽  
Achim Walter Hassel
Keyword(s):  
Dissolution Kinetics ◽  
Ph Values ◽  
Kinetics Of

Dissolution kinetics of a sodium borosilicate glass in Tris buffer solutions: Impact of Tris concentration and acid (HCl/HNO3) identity

2021 ◽  
Author(s):  
Nicholas Stone-Weiss ◽  
Nicholas J Smith ◽  
Randall Yougman ◽  
Eric Pierce ◽  
Ashutosh Goel
Keyword(s):  
Regenerative Medicine ◽  
Nuclear Waste ◽  
Borosilicate Glass ◽  
Dissolution Kinetics ◽  
Sodium Borosilicate Glass ◽  
Buffer Solutions ◽  
Ph Values ◽  
Waste Immobilization ◽  
Nuclear Waste Immobilization ◽  
Kinetics Of

Understanding the corrosion behavior of glasses in near-neutral environments is crucial for many technologies including glasses for regenerative medicine and nuclear waste immobilization. To maintain consistent pH values throughout experiments...

scholarly journals Dissolution kinetics of hydrated calcium aluminates (AFm-Cl) as a function of pH and at room temperature

2017 ◽  
Vol 81 (5) ◽  
pp. 1245-1259 ◽  
Author(s):  
Nicolas C. M. Marty ◽  
Sylvain Grangeon ◽  
Catherine Lerouge ◽  
Fabienne Warmont ◽  
Olivier Rozenbaum ◽  
...  
Keyword(s):  
Dissolution Rate ◽  
Room Temperature ◽  
Dissolution Kinetics ◽  
Dissolution Rates ◽  
Ph Values ◽  
Surface Areas ◽  
Calcium Aluminates ◽  
Waste Repositories ◽  
Kinetics Of ◽  
Hydrated Calcium

AbstractThe determination of reliable weathering/dissolution rates for cement phases is of fundamental importance for the modelling of the temporal evolution of both radioactive waste repositories and CO2 geological storage sites (e.g. waste matrix, plug in boreholes). Here, the dissolution kinetics of AFm-Cl (hydrated calcium aluminates containing interlayer Cl) has been studied using flow-through experiments conducted at pH values ranging from 9.2 to 13. Mineralogical (XRD) and chemical (EPMA, TEM) analyses have been performed to determine the evolution of the phases during the dissolution experiments. For pH values between 10 and 13, the dissolution of AFm-Cl is congruent (i.e. Ca/Al ratios close to 2 both for solids and outlet concentrations). In contrast, the precipitation of amorphous Al-phases and possibly amorphous mixed Al/Ca phases is observed at pH 9.2, leading to Ca/Al ratios in the outlet solutions higher than those of the initial solid. Therefore, at pH 9.2, even if Cl–/OH– exchange occurs, estimation of dissolution rate from released Cl appears to be the best proxy. Dissolution rates were normalized to the final specific surface areas (ranging from 6.1 to 35.4 m2 g−1). Dissolution rate appears to be pH-independent and therefore the far-from-equilibrium dissolution rate at room temperature is expressed as: logR(mol m–2 s–1) = –9.23 ± 0.18

Short time dissolution kinetics of refractory elements Fe, Al, and Ti in Asian outflow-impacted marine aerosols and implications

2013 ◽  
Vol 79 ◽  
pp. 93-100 ◽  
Author(s):  
Shih-Chieh Hsu ◽  
Fei-Jan Lin ◽  
Tsun-Hsien Liu ◽  
Shuen-Hsin Lin ◽  
Shuh-Ji Kao ◽  
...  
Keyword(s):  
Dissolution Kinetics ◽  
Marine Aerosols ◽  
Refractory Elements ◽  
Short Time ◽  
Kinetics Of

Derivatives of isatin in aqueous solution. I. Kinetics of ring opening of Isatin-5-sulfonate

1981 ◽  
Vol 34 (2) ◽  
pp. 365 ◽  
Author(s):  
H Stunzi
Keyword(s):  
Ring Opening ◽  
Rate Of Change ◽  
Spectroscopic Methods ◽  
Ph Values ◽  
Buffer Region ◽  
Pka Value ◽  
Back Titration ◽  
Kinetics Of ◽  
Derivatives Of ◽  
Sulfonate Anion

The reactions of isatin-5-sulfonate anion (si-) which cause a hysteresis in pH titrations were studied by pH-metric and n.m.r, spectroscopic methods. Rapid alkalimetric titrations [I 0.15 M (KNO3),37�] gave the pKa value corresponding to the addition of OH- to si- [pKa(ring) 9.55]. The slow ring opening to the sulfonatoisatate dianion (sia2-) led to a drift of the pH values towards an equilibrium buffer region. Its pKa, value [pKa(eq) 3.44] corresponds to the reaction si-+H2O ↔ sia 2-+H+ Rapid back-titration gave the pKa value of the ring-opened species Hsia- [pKa(open) c. 1.3]. The rate law for the ring opening d[sia]/dt=k2 [siOH](OH)+k1*[si] was obtained from the rate of change of pH. N-Methylisatin-5-sulfonate behaves analogously.

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