Potassium humate repair soil from heavy metal pollution
Potassium humate is a carbon chain molecular structure material with high loading and physiological activity. The leaching characteristics of heavy metal copper in contaminated soil by potassium humate, the leaching effect of potassium humate on soil and crops, and the desorption kinetics of copper in soil under the action of potassium humate and the form of heavy metals before and after adsorption. Change characteristics. The results showed that the longer the application of potassium humate, the greater the concentration, the better the rinsing effect.
Harm of heavy metal copper
With the rapid application of chemical fertilizers and the rapid development of the metallurgical industry, a large amount of heavy metals have entered the human production and living environment and caused serious pollution. Copper is an essential nutrient for the growth and development of animals and plants. When the intake is too low, it will cause metabolic disorders and imbalance of nutrition, leading to disease, but excessive intake can cause disease and even death. The large accumulation of exogenous copper in the soil not only affects the yield and quality of crops, but also affects human health through the food chain. Therefore, the problems caused by heavy metal copper in the soil environment include both plant nutrition problems and soil pollution problems.
In recent years, research on how to effectively remove heavy metal element copper in contaminated soil has been widely concerned. potassium humate acid is considered to be an effective method to repair soil and remove heavy metal pollution. potassium humate acid can increase the content of soluble heavy metals in soil solution, which is beneficial to the leaching and removal of heavy metals in contaminated soil.
Common soil eluent analysis
Commonly used eluents are inorganic eluents, organic eluents and surfactants. Different eluents have different effects on the removal of heavy metals from contaminated soil. Ethylenediaminetetraacetic acid (EDTA) is a commonly used eluent. EDTA is used to wash and wash Cu and Pb in artificially contaminated soil. The removal efficiency of Cu and Pb is better than that of citric acid and rhamnolipid. Due to the poor biodegradability of EDTA, the long shelf life in the environment and the high risk of groundwater, more attention has been paid to the use of biodegradable environmentally friendly eluents for the repair of heavy metals in contaminated soils. YANG et al. used Ethylenediamine disuccinic acid (EDDS) to elute heavy metals in the soil contaminated by electronic waste.
When the concentration of EDDS was 1.26 mol·kg-1, the Cu, Pb, Zn and Cd were rinsed. The efficiencies of the Cu and Pb in the single-contaminated and compound-contaminated soils were saponified by a single leaching solution. The removal rates of Cu and Pb were 29.02%, 25.09% and 31.56%, 28, respectively. .03%. Complexing agents such as EDDS and surfactants are biodegradable, but are often expensive and limit their large-scale engineering applications. Therefore, it is crucial to choose potassium humate that can remove heavy metals from soil restoration, environmental protection, and robust plants.
Effect of potassium humate solution on removal of heavy metal copper
In an alkaline soil environment, many basic elements and trace elements are present in a form that cannot be absorbed by plants. The humic acid in potassium humate can buffer the pH and convert these basic nutrients and trace elements into A form that can be absorbed by plants; in a ring of acidic soil.