title: Embedment of Ag(I)-organic frameworks into silica gels for microextraction of polybrominated diphenyl ethers in soils.
abstract: Three Ag(I)-organic frameworks, [Ag5(pydc)2(CN)]n, {[Ag4(pydc)2]CH3CN}n, and [Ag(4,4'-bpy)NO3]n, were synthesized and embedded into silica gels to form metal-organic-framework (MOF)-embedded gels for the microextraction of polybrominated diphenyl ethers (PBDEs) in soils. Despite the great differences in the structures of the organic ligands, all three Ag(I)-organic frameworks were found to effectively accumulate and concentrate PBDEs from sample solutions prepared with contaminated soil and purified water, indicating the important roles of Ag centers in PBDE extraction. Under the optimal experimental conditions (MOF mass, water volume, temperature, extraction time, and back-extraction time) for PBDE extraction from sample solutions, the detection limits of seven PBDEs (BDE-28, 47, 99, 100, 153, 154, and 183) ranged from 0.01 to 2.6ngg(-1) for [Ag5(pydc)2(CN)]n, 0.20-0.64ngg(-1) for {[Ag4(pydc)2]CH3CN}n, and 0.60-3.08ngg(-1) for [Ag(4,4'-bpy)NO3]n. The reproducibilities of the three methods were all satisfactory with relative standard deviations (RSDs) in the range of 2.2-9.6%, 5.3-10.4%, and 6.9-9.4% for [Ag5(pydc)2(CN)]n, {[Ag4(pydc)2]CH3CN}n, and [Ag(4,4'-bpy)NO3]n, respectively. The use of Ag(I)-organic frameworks for the microextraction of PBDEs was validated using both certified reference soils and field-contaminated soils, and the proposed methods are recommended as rapid and environmentally friendly alternatives for the extraction and determination of PBDEs in soils.
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
authors.forename: Chao-Yan
authors.initials: CY
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
authors.forename: Zeng-Guang
authors.initials: ZG
authors.lastname: Yan
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China. Electronic address: zhouyy@craes.org.cn.
authors.forename: You-Ya
authors.initials: YY
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China; College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, 100022, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Wang
authors.affiliation: College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, 100022, China. Electronic address: xieyabo@bjut.edu.cn.
authors.forename: Ya-Bo
authors.initials: YB
authors.lastname: Xie
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
authors.forename: Li-Ping
authors.initials: LP
authors.lastname: Bai
authors.affiliation: National Application Software Product Quality Supervision and Testing Center, Beijing, 100139, China.
authors.forename: Hui-Yan
authors.initials: HY
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
authors.forename: Fa-Sheng
authors.initials: FS
authors.lastname: Li
mesh_terms: D002849:Chromatography, Gas; D004784:Environmental Monitoring / Q000379:methods*; D055768:Halogenated Diphenyl Ethers / Q000032:analysis* / Q000302:isolation & purification; D009930:Organic Chemicals / Q000737:chemistry*; D058428:Silica Gel / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis* / Q000302:isolation & purification; D052617:Solid Phase Microextraction; D013696:Temperature; D014867:Water / Q000737:chemistry
chemical_list: D055768:Halogenated Diphenyl Ethers; D009930:Organic Chemicals; D012989:Soil Pollutants; D014867:Water; D012834:Silver; D058428:Silica Gel
keywords: Ag-organic frameworks; MOF-embedded gel; Microextraction; Polybrominated diphenyl ethers; Soil