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half-life
(english) The time required for a chemical to lose 50% of its concentration or activity. (See also: toxin, Environmental Impact Assessment, bioassay)
demi-vie
(french) Temps nécessaire à un produit chimique pour perdre 50% de sa concentration ou de son activité. (See also: toxin, Environmental Impact Assessment, bioassay)
semi-vida
(portuguese) Tempo que um produto químico requer para perder 50% da sua concentração ou actividade. (See also: toxin, Environmental Impact Assessment, bioassay)

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