Four phyla and ten families based method for obtaining ecological safety thresholds of lead and chromium in soil

Abstract

The invention discloses a four phyla and ten families based method for obtaining ecological safety thresholds of lead and chromium in soil. The method includes the steps of: screening the collected biological toxicity data; analyzing and screening the collected measured ecotoxicological data; according to the screened and analyzed measured ecotoxicological data, conducing ecotoxicological tests of Pb<2+> and Cr<6+> in the soil of a typical chemical industry zone and endpoints in accordance with four phyla and ten families, wherein test terminal points include chronic toxicity NOEC values on biological growth inhibition and reproduction; and according to a log-logistic function in a preset species sensitivity distribution method, respectively fitting the screened literature ecotoxicological data and ecotoxicological test data, and calculating the ecological safety threshold values of Pb<2+> and Cr<6+> in the soil of the typical chemical industry zone under each cumulative probability according to the fitting results. The method of the invention can effectively evaluate the soil ecological risk caused by heavy metal pollutants.

Description

technical field [0001] The invention relates to soil ecological technology, in particular to a method for obtaining ecological safety thresholds of lead and chromium in soil based on four families and ten families. Background technique [0002] With the rapid development of social economy, the global demand for metals is also increasing, making the mining and smelting of metal deposits present a geometric growth trend. The heavy metals used in large quantities enter the soil through various channels, causing pollution to the soil environment and posing a serious threat to soil ecological security and human health. For example, although the construction and planning of a large number of industrial parks has ensured the organic integration of different enterprises, the aggregation of a large number of enterprises and the discharge of industrial wastewater and liquid waste have also brought certain pressure on the ecological environment of industrial parks and surrounding areas...

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Problems solved by technology

[0004] At present, in view of the technical problems of soil heavy metal pollution in my country's chemical industry areas, the ecological safety thresholds of relevant soil heavy metals (lead, chromium) have not been proposed to effectively evaluate the soil ecological risks caused by heavy metal pollutants, and to build a suitable for my country's national conditions. The method of obtaining the ecological safety threshold of soil heavy metals in chemical industry areas, so as to provide direct technical support and decision-making basis for the supervision of soil environmental ecological risks caused by heavy metal pollutants in chemical industry areas

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