Soil heavy metal composite passivator with humic acid minerals and preparation method thereof

Abstract

The invention discloses a soil heavy metal composite passivator with humic acid minerals and a preparation method thereof. The soil heavy metal composite passivator is prepared by humic acid mineral powder, fused calcium magnesium phosphate and quick lime according to a certain proportion. The preparation method comprises the following steps: A, preparing the humic acid mineral powder: taking humic acid raw ore, carrying out ball-milling to the humic acid raw ore, and sieving the humic acid raw ore by a 110-140-mesh sieve for standby; and B, uniformly mixing the raw material prepared in the step A, fused calcium magnesium phosphate and quick lime, adjusting the water content of the mixture to be 10% counting by H2O, and stacking the mixture for five-seven days to obtain the soil heavy metal composite passivator with the humic acid minerals, so that the operation is simple and the method is easy to implement. By the invention, the available cadmium content of red sand mud soil with thefull-cadmium content of 10mg / kg (by exogenous adding) is reduced by 0.36-2.25mg / kg within ninety-day culture time, the reduction amplitude reaches up to 4.7-25.7%, the efficiency of the soil heavy metal composite passivator with the humic acid minerals under a water condition of 45% WHC (Water-holding Capacity) is better than that under a flooded condition, and the soil heavy metal composite passivator with the humic acid minerals also has the functions of passivating heavy metal in soil, soil fertility and the like and has significant popularization and application values in vast heavy metalpollution regions.

Description

technical field [0001] The invention belongs to the technical field of agricultural environment conservation and restoration, and more specifically relates to a soil heavy metal composite passivator containing humic acid minerals, and also relates to a preparation method of a soil heavy metal composite passivator containing humic acid minerals. It is suitable for all kinds of soils polluted by heavy metals, especially dryland soils. Background technique [0002] With the rapid development of industry and the continuous increase of agricultural input intensity, a large number of heavy metals and other pollutants have entered the soil environment, which has caused heavy metal pollution in soil and has become a worldwide problem that has been widely concerned. Heavy metals in soil can be absorbed by plants and enter the food chain, posing a serious threat to human health. According to reports, the area of ​​cultivated land polluted by heavy metals such as cadmium, lead, mercur...

AI Technical Summary

Problems solved by technology

A large number of studies have shown that humic acid can change the existing form of harmful heavy metal elements such as cadmium in the soil, thereby affecting its availability to plants

However, this effect is multiple. Fulvic acid with a smaller molecular weight will promote the desorption of heavy metal elements such as cadmium in the soil and enhance its effectiveness for plants; fulvic acid and brown humic acid with a larger molecular weight can effectively passivate The activity of heavy metal elements such as cadmium in the soil, thereby reducing their availability to plants

However, the extraction cost of fumic acid and brown humic acid is relatively high, and it is very difficult to popularize and apply them on a large scale

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