External considerations ■ Bioaccumulation(生物集聚)or Bio-magnification(生物放大 It refers to the increase of tissue concentration of a chemical as it progresses up the food chain. 四大学化学学院 2002年7月26日四川大学化学学院 2002年7月26日 11 External considerations ◼ Bioaccumulation（生物集聚）or ◼ Bio-magnification (生物放大): ◼ It refers to the increase of tissue concentration of a chemical as it progresses up the food chain