Factors Affecting Absorption Of Phthalates By Radish Seedlings

Phthalates esters(PAEs)are commonly used in China and are common in agricultural soils in China.PAEs contamination in agricultural soils can cause various vegetable and food safety problems,which pose a threat to human health.Therefore,it is necessary to study the adsorption and distribution of PAEs in soil and vegetables and the factors affecting the adsorption and distribution of PAEs in soil and vegetables in order to understand the characteristics of PAEs migration and transformation in agricultural environment and to explore measures to control PAEs pollution.This article through a series of experimental studies,in order to improve the quality of agricultural products,to control the content of PAEs in vegetables,reduce the harm caused by PAEs,and even use plants to repair soil PAEs pollution,as well as to protect human health to provide new ideas.It also provides important information for the study of plant uptake and translocation of PAEs.Food safety is closely related to each of us.This study is of great significance to improving the quality of agricultural products,ensuring food safety,and building an environmentally friendly society.The article first studied the mutual adsorption of diethyl phthalate(DEP)and soil through soil adsorption experiments;then through a hydroponics experiment,the radish seedlings were studied for diethyl phthalate(DEP)and neighbors.Absorption accumulation and metabolism of di-n-butyl phthalate(Dn BP);and the effects of temperature,nutrient elements(N,P,and K),and pH on the absorption of PAEs by radish seedlings;finally,the absorption and transport of Dn BP by radish The process further explores ways of radish absorption of PAEs.The main findings are as follows:(1)Soil organic carbon(SOC)can be dissolved into dissolved organic carbon(DOC)in soil,and the addition of DEP will dissolve more aliphatic SOC into DOC.In addition,SOC plays an important role in the adsorption of DEP and in the migration and transformation of DEP,which makes it easier for surface soil with higher SOC content to adsorb DEP than underground soil with low SOC content.The interaction between DEP and soil is complex and not completely reversible.(2)The content of PAEs in plants showed a positive correlation with the degree of environmental pollution.However,due to differences in their physical and chemical properties,different PAEs compounds also have different accumulation and degradation characteristics in crops.Compared to DnBP,DEP with a relatively small molecular weight is more likely to be absorbed by the roots of radish seedlings and transferred to the leaves.DnBP with a relatively large molecular weight is more likely to be concentrated in the roots of radish and relatively less likely to be transferred to the leaves.In addition,the degradation rate of DnBP is also slower than that of DEP.DEP has a relatively small molecular weight,a relatively low octanol-water partition coefficient,and a relatively high water solubility,so it is more easily absorbed by radish,transported and accumulated to stems and leaves,and is also more easily decomposed by radish metabolism.DnBP is lower in water solubility than DEP,and after entering the plant,DnBP can stay in the plant roots,stems and leaves for a relatively long time,showing a strong bioaccumulation.(3)The increase in temperature will increase crop absorption of PAEs to a certain extent.In facilities agriculture,good temperature management can affect the PAEs content of crops to a certain extent.Plant stems and leaves can also directly absorb PAEs in the air.In a closed vegetable greenhouse,the absorption of leafy vegetables can not be ignored.In winter,the temperature is relatively low,and the PAEs content in the environment is relatively lower than that in summer.However,the ventilation of greenhouses in winter will be reduced,which will increase the PAEs content in the air in greenhouses and promote the absorption of PAEs by vegetables.In summer,the temperature is high,and PAEs in the environment are relatively high.Higher levels can reduce plant leaf uptake by enhancing ventilation.Simultaneous control of temperature and ventilation can,to a large extent,control the PAEs content in vegetables.(4)The absorption and transport of PAEs in radish is related to the form and concentration of nitrogen(N).Increasing the concentration of NO3 in a certain concentration range can reduce the absorption of DnBP by radish and promote the transfer of DnBP to the roots.The increase of NH4+ has an opposite effect on the absorption of PAEs by radish seedlings.The increase of ammonium salt increases the absorption of PAEs in the roots of radish seedlings.And inhibit the PAEs transport.However,P and K have little effect on the absorption and transfer of DEP and DnBP.When controlling the agricultural PAEs in facilities,the application of different proportions of nitrogen fertilizer or ammonia fertilizer can control the enrichment of edible parts of PAEs in the vegetable body to a certain extent,so as to reduce the PAEs to the human body.Exposure hazards.