Composite heavy metal passivator containing secondary reduction iron powder and use method of passivator

Abstract

The invention discloses a composite heavy metal passivator containing secondary reduction iron powder and a use method of the passivator. The passivator is formed by evenly mixing sulfur, the secondary reduction iron powder and calcium hydroxide according to the weight ratio of 1:15:50; during soil preparation before sowing or seedling transplant, the composite heavy metal passivator and base fertilizer are evenly applied to soil of a tillage layer in a vegetable field polluted by heavy metal, and the application amount is 132 kg per mu. The composite heavy metal passivator is added on the basis of conventional applied fertilizer, so the content of available heavy metal in soil of the field can be obviously reduced, the amount of soil heavy metal absorbed by vegetable crops is reduced, the heavy metal pollution degree of vegetable products is reduced, and the risk of heavy metal toxin caused to human bodies due to vegetable eating is reduced.

Description

technical field [0001] The invention belongs to the technical field of agricultural resources and environment, and in particular relates to a composite heavy metal passivator containing secondary reduced iron powder and a use method thereof. Background technique [0002] With the rapid advancement of China's industrialization and urbanization process, soil heavy metal pollution has become increasingly prominent, and the "three wastes" of chemical, mining, and smelting industries, urban traffic, atmospheric deposition, livestock and poultry manure, urban sludge, pesticides and fertilizers have become major sources of pollution. According to the "National Soil Pollution Survey Bulletin" (April 17, 2014), the over-standard rate of cultivated land soil points in China was 19.4%, of which light and moderately polluted points accounted for 94.3% of the total over-standard points; Inorganic pollutants (inorganic pollutants refer to 8 heavy metals including cadmium, mercury, arsenic...

AI Technical Summary

Problems solved by technology

At present, most of the research on the zero-valent iron powder system focuses on the passivation reaction of zero-valent iron powder to heavy metals in water, but there are few reports on the remediation of soil or sediment polluted by heavy metals.

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