No abstract

Adsorption is one of the main mechanisms of soil contamination by volatile chlorinated hydrocarbons (VCHs). Static equilibrium adsorption experiments were carried out in the study to investigate the adsorption equilibriums of six VCHs to three typical dry paddy soils in Yangtze Delta Region of China . The adsorption equilibriums of the dry soils were fitted well with the Dubinin-Astakhov equation. The equation's parameters were analyzed with the characteristic values of both the soils and VCHs. No apparent correlation was observed between the affinity coefficient (β) and the molecular volume of VCHs, but β tended to increase with the increase in the molecular polarizabilities of VCHs. A positive linear correlation was derived between the adsorption energy value (E 0 ) of the reference compound (tetrachloroethylene) and the pore volume of radius less than average pore radius (V

Sample pretreatment is a vital step in the detection of mycotoxins, and traditional pretreatment methods are time-consuming, labor-intensive and generate much organic waste liquid. In this work, an automatic, high-throughput and environmentally friendly pretreatment method is proposed. Immunomagnetic beads technology and dispersive liquid–liquid microextraction technology are combined, and the zearalenone in corn oils is directly purified and concentrated under the solubilization effects of surfactant. The proposed pretreatment method allows for the batch pretreatment of samples without pre-extraction using organic reagents, and almost no organic waste liquid is produced. Coupled with UPLC-FLD, an effective and accurate quantitative detection method for zearalenone is established. The recovery of spiked zearalenone in corn oils at different concentrations ranges from 85.7 to 89.0%, and the relative standard deviation is below 2.9%. The proposed pretreatment method overcomes the shortcomings of traditional pretreatment methods and has broad application prospects.