WCO Explanatory Notes reproduced for reference. © World Customs Organization. Verify against official WCO publication.
28.45 - Isotopes other than those of heading 28.44; compounds, inorganic or organic, of such isotopes, whether or not chemically defined. Heavy water (deuterium oxide) 2845.10 - 2845.90 - Other For the definition of the term " isotopes ", see Part (I) of Explanatory Note to heading 28.44. This heading covers stable isotopes, that is, non-radioactive isotopes and their inorganic or organic compounds, whether or not chemically defined. The heading includes the following isotopes and their compounds : (1) Heavy hydrogen or deuterium. This is separated from normal hydrogen in which it occurs at a level of 1 part in 6,500. water at a level of 1 part in (2) Heavy water, which is deuterium oxide. Occurrin in or6,500. It is normally obtained as a residue of the e ectrolysis of water. Used as a source of deuterium, and in nuclear reactors for slowing down the neutrons which split the uranium atoms. (3) Other compounds made with deuterium, e.g., heavy acetylene, heavy methane, heavy acetic acids and heavy paraffin wax. (4) The isotopes of lithium known as lithium 6 or 7, and their compounds. (5) The isotope of carbon known as carbon 13, and its compounds.
1.- Except where the context otherwise requires, the headings of this Chapter apply only to : (a) Separate chemical elements and separate chemically defined compounds, whether or not containing impurities; (b) The products mentioned in (a) above dissolved in water; (c) The products mentioned in (a) above dissolved in other solvents provided that the solution constitutes a normal and necessary method of putting up these products adopted solely for reasons of safety or for transport and that the solvent does not render the product particularly suitable for specific use rather than for general use; (d) The products mentioned in (a), (b) or (c) above with an added stabiliser (including an anti-caking agent) necessary for their preservation or transport; (e) The products mentioned in (a), (b), (c) or (d) above with an added anti-dusting agent or a colouring substance added to facilitate their identification or for safety reasons, provided that the additions do not render the product particularly suitable for specific use rather than for general use.