Abstract
To obtain the desired specific adsorbents for chlorpyrifos to enrichment, separation and analysis of trace pesticides residue, molecularly imprinted polymer microspheres were prepared by precipitation polymerization using chlorpyrifos and methacylic acid (MAA) as template and functional monomer respectively. Computer simulation was employed to demonstrate the mechanism of the interaction between chlorpyrifos and MAA. The adsorption properties of chlorpyrifos, in acetonitrile for imprinted microspheres were evaluated by equilibrium rebinding experiments. Scatchard plot analysis revealed that there was a class of binding sites populated in the molecularly imprinted polymers (MIPs). The specificity of the imprinted microspheres was investigated by binding analysis using chlorpyrifos and related organophosphate pesticides. The results indicated that the obtained imprinted microspheres showed a good selectivity for chlorpyrifos.
Highlights
Chlorpyrifos, a kinds of organophosphate pesticides, is most frequently used to control insect and pests on agricultural and vegetable crops, due to the lower environmental persistence
The present work describes the preparation of chlorpyrifos-imprinted polymer using chlorpyrifos as template, methacrylic acid (MAA) as functional monomer, ethylene glycol dimethacrylate (EGDMA) as cross-linker, azobisisobutyronitrile (AIBN) as initiator and acetonitrile as porogen, respectively
The amount of chlorpyrifos bound to molecularly imprinted polymers (MIPs) at equilibrium experiment increased along with increasing the initial concentration of chlorpyrifos and the amount on MIPs is larger than that on Non-MIPs, which suggested that chlorpyrifos binding to imprinted microspheres might be caused by the specific binding to a certain number of binding sites populated in the imprinted microspheres
Summary
Chlorpyrifos, a kinds of organophosphate pesticides, is most frequently used to control insect and pests on agricultural and vegetable crops, due to the lower environmental persistence. They have high acute toxicity to human health and ecosystems [1]. The present work describes the preparation of chlorpyrifos-imprinted polymer using chlorpyrifos as template, methacrylic acid (MAA) as functional monomer, ethylene glycol dimethacrylate (EGDMA) as cross-linker, azobisisobutyronitrile (AIBN) as initiator and acetonitrile as porogen, respectively. The selectivity of the obtained particles was elucidated by the different rebinding capability of the chlorpyrifos and the related compounds. Desired pesticide imprinted polymer microspheres were obtained for the separation, enrichment and analysis of trace pesticides residue
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