Mercuric chloride (HgCl2) is a common heavy-metal pollutant widely used in commercial products and industry, but its excessive use uncontrolled discharge have caused great harm to aquatic environments human health. To research the mechanisms of HgCl2 toxicity organisms, this study cultured green alga Scenedesmus quadricauda gradient concentrations (0, 0.1, 0.3, 0.5, 0.7, 0.9 mg/L) for 9 days. T...