H_2s is a colourless, toxic gas widely existing in natural environment and some working sites.Its poisoning mechanism is inhibitting cytochromeoxidase, and breaking in on oxidation in cells.

• 硫化氢是广泛存在于自然环境及某些工作场所的无色剧毒气体,其主要中毒机制是抑制细胞色素氧化酶,中断细胞的有氧氧化。