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Tank. Tank means a portable tank (including a tank-container), a road tank vehicle, a rail tank wagon or a receptacle with a capacity of not less than 450 litres to contain solids, liquids, or liquefied gases.

Technical name. A recognized chemical name, if relevant a biological name, or other name currently used in scientific and technical handbooks, journals and texts.

Threshold. The lowest dose or exposure to a chemical at which a specific effect is observed.

Time-weighted average concentration (TWA). Refers to concentrations of airborne toxic materials which have been weighted for a certain time duration, usually 8 hours.

TLV. Threshold Limit Value. A time-weighted average concentration under which most people can work consistently for 8 hours a day, day after day, with no harmful effects. A table of these values and accompanying precautions is published annually by the American Conference of Governmental Industrial Hygienists.

Toxicity. A relative property of a chemical agent and refers to a harmful effect on some biologic mechanism and the conditions under which this effect occurs.

Transboundary movement of wastes. Transboundary movement of wastes means any shipment of wastes from an area under the national jurisdiction of one country to or through an area under the national jurisdiction of any country, or to or through an area not under the national jurisdiction of any country, provided at least two countries are concerned by the movement.

Transport unit. A motor vehicle without an attached trailer, or a combination consisting of a motor vehicle and an attached trailer;