摘要: Algal bioassays for heavy metals can detect low levels in the environment, example, 0.01 ppm silver. Algae respond to increasing of such as copper, nickel, mercury, silver, or cadmium by reduction growth rate. Occasionally, response nontoxic is an increase At very concentrations some potentially toxic may be necessary micronutrients. species differ quite markedly their sensitivity metals. Combined effects two more at synergistic (for copper-nickel) antagonistic cadmium-selenium). The critical toxicity a particular metal different times during algal culture, well being dependent upon other chemical and physical conditions. cells appear concentrate from solution, even these medium which do not apparently inhibit cell division. Bioassays provide only direct method assessing biological availability solution. isolated metal-polluted lakes have evolved specific tolerances. These "tolerant" algae actually accumulate concerned than "nontolerant" relatives. Correlations between fish tests allow relatively expensive testing schemes replaced simple cheaper bioassays.