METHOD FOR ECOLOGICAL RISK ASSESSMENT OF HEAVY METAL IN RIVER BASIN SEDIMENT BASED ON TOXICITY EFFECT

摘要

Provided is a method for determining ecological risk, particularly a method for the ecological risk assessment of a heavy metal in a river basin sediment based on a toxicity effect. The assessment method mainly comprises the following steps: 1. screening the main aquatic organisms in a river basin, 2. sampling a sediment, and determining and detecting the heavy metal type, 3. measuring the concentration of the heavy metal in the sediment, 4. collecting the heavy metal release coefficient, 5. collecting the heavy metal toxicity data and fitting the data, 6. determining the heavy metal HC_sⁱ value according to a fitting equation, 7. calculating the heavy metal toxicity coefficient, 8. calculating the heavy metal toxicity response coefficient, and 9. calculating the ecological risk index of the heavy metal. This method can further comprise step 10: calculating the comprehensive ecological risk index of various types of heavy metals. Compared with the prior art using the crustal abundance to indirectly and roughly estimate the metal toxicity effect, the method can more accurately reflect the ecological risk of a heavy metal on aquatic organisms in a river basin.