t½
Description:
Iż-żmien meħtieġ għal 50 % ta’ sustanza preżenti f’individwu, f’popolazzjoni jew f’ekosistema biex titkisser jew tiġi eliminata b’mod naturali. In-nofs ħajja, jew t½, ta’ spiss tintuża biex tiddeskrivi l-għajbien ta’ sustanzi potenzjalment ta’ ħsara bħas-sustanzi kimiċi tossiċi
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