| As people pay more attention to health problems,the organic pollutant residues in food and environment become more and more prominent.Complex matrix composition and the presence of trace amount make some organic pollutants cannot be directly detected.Usually,sample pretreatment technology is used to treat complex matrix for further analysis and detection.Solid phase extraction(SPE)and magnetic solid phase extraction(MSPE)have become a widely used sample pretreatment technology due to their advantages of simple,environmental protection,accuracy and high efficiency,and are widely used in food,environment and biomedicine detection.Adsorbents are the core of SPE and MSPE technology.It is of great significance to develop adsorbents with strong adsorption capacity and stable physical and chemical properties to improve the effect of SPE and MSPE technology.Porous organic polymer(POPs)has the advantages of stability,large specific surface area and abundant functional groups,and is a good choice for adsorbent.In this work,several porous organic polymers were designed and synthesized as adsorbents for SPE or MSPE process,and a simple and efficient method was established in combination with high performance liquid chromatography(HPLC)for the detection of trace organic pollutants in water samples,juice samples and milk samples.1.Using natural rutin as monomer,a magnetic porous organic polymer(named RutMOP)rich in hydroxyl groups were synthesized by diazo coupling reaction.Rut-MOP showed a high adsorption capacity for neonicotinoid insecticides(thiamethoxam,imidacloprid,acetamidine and thiacloprid).In this work,a Rut-MOP based SPE-HPLC method was developed for the detection of neonicotinoids in lemon juice and honey.Under optimal conditions,the linear ranges of the four neonicotinoids in lemon juice and honey were 0.1-100.0 ng mL-1 and 8.0-1000.0 ng g-1,respectively.The detection limits(S/N=3)in lemon juice and honey were 0.03-0.04 ng mL-1 and 2.5-3.0 ng g-1,respectively.The recoveries were 82-118%,and the relative standard deviations were 1.9-7.6%.The results indicated that Rut-MOP could be used as an adsorbent for sensitive detection of neonicotinoids in lemon juice and honey.2.A novel hypercrosslinked polymer(denoted as API-HCP)was facilely synthesized using natural apigenin as monomer.The API-HCP exhibited high adsorption affinity toward chlorophenols due to the hydrogen bond,halogen bond and π stacking interactions.A sensitive method for the determination of chlorophenols in water and honey based on API-HCP as adsorbent was developed by HPLC.Under optimal conditions,the linear ranges of the four chlorophenols in water and honey were 0.07-100 ng mL-1 and 1.7-500 ng g-1,respectively.The detection limits of water samples and honey samples were 0.02-0.07 ng mL-1 and 0.5-1.5 ng g-1(S/N=3),respectively.The recoveries ranged from 84.0%to 116.0%.The results show that the method has been successfully applied to the sensitive detection of chlorophenols in water and honey and has a wide application prospect.3.A novel carboxyl functionalized porous polymer(PDA-DPBP)was facilely synthesized for the first time via acylation reaction between 4,4’-diphenylbiphenyl and pyromellitic dianhydride.PDA-DPBP delivered superior enrichment efficiency for the phenolic EDCs,which can be ascribed to the strong hydrogen bonding,pore filling,hydrophobic interaction and π-π interaction between PDA-DPBP and phenolic EDCs.The determination of phenolic EDCs in water,fruit juice and milk samples by SPE and HPLC based on PDA-DPBP has obtained low detection limits and wide linear ranges.The linear ranges of this method in water,juice and milk were 0.04-100,0.07-100 and 0.15-500 ng mL-1,respectively.The detection limits(S/N=3)were 0.01-0.04,0.02-0.06 and 0.05-0.10 ng mL-1,respectively.The recoveries were 81.6-116%,RSDs≤7.7%.This work also provides a facile method for preparation of carboxyl functionalized porous polymer as superior sorbent for sensitive determination or effective removal of phenolic EDCs. |
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