Mercury and its compounds ( especially alkyl mercury) have very strong biological toxicity. And the rate of biological enrichment and amplification were higher than other heavy metals. Meanwhile, their biological half-lifes in brain organ were also much longer. 汞及其化合物(特别是烷基汞)具有很强的生物毒性、较快的生物富集放大速率和较长的脑器官生物半衰期。