Ecological risk assessment method of heavy metal in river basin sediment based on toxicity effect

Abstract

The invention relates to a method for determining ecological risks, particularly to an ecological risk assessment method of heavy metal in river basin sediment based on the toxicity effect. The assessment method mainly comprises the following steps: 1, screening main aquatic organisms in the river basin, 2, sampling sediment, and determining and detecting types of heavy metal, 3, detecting the heavy metal concentration in the sediment, 4, collecting the heavy metal release coefficient, 5, collecting heavy metal toxicity data and fitting the data, 6, determining the heavy metal HC5 value according to a fitted equation, 7, calculating the heavy metal toxicity coefficient, 8, calculating the heavy metal toxicity response coefficient, and 9, calculating the heavy metal ecological risk index, and the method can further comprise a step 10 of calculating the comprehensive ecological risk index of various types of heavy metal. Compared with the prior art that the crustal abundance is adopted to indirectly and roughly estimate the metal toxicity effect, the assessment method provided by the invention can more accurately reflect the ecological risks, caused by the heavy metal in the sediment, to the aquatic organisms in the river basin.

Description

technical field [0001] The invention relates to an ecological risk determination method, in particular to an ecological risk assessment method for heavy metals in watershed sediments based on toxic effects. Background technique [0002] Heavy metal pollutants are different from other organic pollutants. Many organic pollutants can be purified physically, chemically or biologically in nature to reduce or eliminate their harmfulness. However, heavy metal pollutants are difficult to degrade in the environment and have a negative impact on the ecological environment. It will cause great harm to human health and potential environmental risks. With the rapid development of my country's economy, industrial and agricultural activities produce a large amount of waste containing heavy metals. The heavy metals enter rivers and lakes and other water bodies through migration and release, and most of them are quickly transferred to sediments and suspended solids. Suspended solids In the p...

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Problems solved by technology

In addition, the existing ecological risk assessment methods for heavy metals in sediments still lack the consideration of the toxic effects of heavy metals on aquatic organisms, let alone the differences in the distribution of biota in different watersheds.

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