@article{MAKHILLAJIT2006595208,
    title = {Hydrogen-Deuterium Exchange Experiments Between Laboratory Water and Clays (Pure Metahalloysite)},
    journal = {Asian Journal of Information Technology},
    volume = {5},
    number = {9},
    pages = {1023-1027},
    year = {2006},
    issn = {1682-3915},
    doi = {ajit.2006.1023.1027},
    url = {https://makhillpublications.co/view-article.php?issn=1682-3915&doi=ajit.2006.1023.1027},
    author = {Fella Assassi and},
    keywords = {Metahalloysite,clay,stable isotopes,exchange experiments},
    abstract = {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.}
    }