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 -