TY  - JOUR
T1  - Hydrogen-Deuterium Exchange Experiments Between Laboratory Water and Clays (Pure Metahalloysite)
AU - , Fella Assassi AU - , Christophe Renac 
JO  - Asian Journal of Information Technology
VL  - 5
IS  - 9
SP  - 1023
EP  - 1027
PY  - 2006
DA  - 2001/08/19
SN  - 1682-3915
DO  - ajit.2006.1023.1027
UR  - https://makhillpublications.co/view-article.php?doi=ajit.2006.1023.1027
KW  - Metahalloysite
KW  -clay
KW  -stable isotopes
KW  -exchange experiments
AB  - Reliability of hydrogen isotopes analyses have been discussed by some  authors. Using  highly depleted water all agree that the hydroxyl group in 10 Å halloysite can exchange hydrogen by 30% in minutes with interlayer water and therefore exchange is fast enough to occur during clay separation in the laboratory with ambient water. Even if most halloysite 10 Å samples were exchangeable there has not been many experiments done on collapsed 7Å halloysite (metahalloysite) because of it’s re-expandable capacity.  Since little information is known about halloysite-hydrogen exchange, exchange experiments were designed  between laboratory water of  D-66 and -184‰ V-SMOW and clay minerals  ( pure metahalloysite ) from two size fractions of <0.5 and 2-5 µm for 2 years at room temperature  with ratio 15 mg water for 1 mg of clay were designed to prove the validity of  D.These experiments attest that metahalloysite does not allow hydrogen exchange in laboratory conditions. Therefore  D values are reliable, increases with smaller size fraction and the difference between metahalloysite and kaolinite are either related to temperature variation from 15 to 25°C or exchanges.
ER  -