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Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC.1/Circular.1216 – Revised Recommendations on the Safe Transport of Dangerous Cargoes and Related Activities in Port Areas – (26 February 2007) - Annex - Revised Recommendations on the Safe Transport of Dangerous Cargoes and Related Activities in Port Areas - Appendix 1 - Glossary of Terminology of Relevance to the Handling of Dangerous Cargoes - I

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Parent topic: Appendix 1 - Glossary of Terminology of Relevance to the Handling of Dangerous Cargoes

Inert

 A term used in chemistry to indicate complete chemical inactivity of an element or compound. Examples are:

  • inert gaseous elements; and
  • carbon dioxide is an inert gaseous compound.

Inert gas

  (1) Helium, neon, argon, krypton, xenon and radon are inert gases, so called noble gases.

Krypton, xenon and radon have radioactive isotopes and nuclides.

  (2) In respect of oil tankers, this is a gas or a mixture of gases, such as flue gas, containing insufficient oxygen to support the combustion of hydrocarbons.

Inerting

 In respect of oil tankers, this is an introduction of inert gas into a tank with the object of attaining the inert conditions.

Inhibitor

 A compound that retards or stops an undesired chemical reaction, such as corrosion, oxidation or polymerization.

Inorganic acids

 These are mineral acids: sulphuric, nitric, hydrochloric, phosphoric. Hazard: all mineral acids are highly irritating and corrosive to living tissues.

Inorganic compound

 Any chemical compound that does not contain the element carbon (C) with the exception of carbon dioxide, and compounds containing a carbonate radical (-CO3), e.g., calcium carbonate.

Isomer

 A molecule having the same number and kind of atoms as another molecule, but differing from it in respect to atomic arrangement and configuration.

Isotope

 One two or more forms or species of an element that have the same atomic number, i.e. the same position in the Periodic Table, but different atomic masses. The difference in mass is due to the presence of one or more extra neutrons in the nucleus.

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