Sampling 4-chlorophenol in water by DGT technique with molecularly imprinted polymer as binding agent and nylon membrane as diffusive layer

Dong, Jia; Fan, Hong-Tao; Sui, Dianpeng; Li, Liangchen; Sun, Ting

doi:10.1016/j.aca.2014.03.015

Cited by 70 publications

(46 citation statements)

References 55 publications

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“…The K value is an indicator to express the enhancement of adsorption affinity and selectivity of mt-MIPs for template versus mt-NIPs. Its related results indicated that the geometric affinity also played an essential role in the selectivity of MIPs except the hydrogen bond ability between mt-MIPs and template [31]. Consequently, all the above results from Fig.…”

Section: Adsorption Analysis and Recognition Selectivity Of Mt-mipssupporting

confidence: 49%

Multi-template imprinted polymers for simultaneous selective solid-phase extraction of six phenolic compounds in water samples followed by determination using capillary electrophoresis

Lü

Wang

et al. 2017

Journal of Chromatography A

122

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a b s t r a c tNovel multi-template molecularly imprinted polymers (mt-MIPs) with six phenolic compounds as the template, namely phenol, 4-chlorophenol (4-CP), 2,4,6-trichlorophenol (2,4,6-TCP), 2,4-dichlorophenol (2,4-DCP), 2-chlorophenol (2-CP) and 2,6-dichlorophenol (2,6-DCP), were prepared by precipitation polymerization and used as the adsorbents of solid-phase extraction (SPE), and coupled with capillary electrophoresis (CE) for the simultaneous selective extraction, separation and determination of trace phenolic compounds in water samples. The resultant mt-MIPs exhibited uniform spherical morphology, large specific surface area and high thermal stability, and offered high selectivity towards the six template phenolic compounds. Various parameters affecting the molecularly imprinted SPE (MISPE) efficiency were investigated in detail, and excellent CE separation was realized within 7 min. Good linearity was obtained in the range of 1-200 g L −1 for phenol and 4-CP, and 1-300 g L −1 for 2,4,6-TCP, 2,4-DCP, 2-CP and 2,6-DCP. High sensitivity was attained with low limits of detection and quantification ranging from 0.17 to 0.31 g L −1 and 0.57 to 1.03 g L −1 , respectively. Satisfactory recoveries for spiked reservoir water, river water, tannery wastewater and tap water samples were achieved in the range of 82.13-105.63% with relative standard deviations within 1.68-6.96%. The developed MISPE-CE method proved practically feasible for simultaneous selective extraction/enrichment, separation and sensitive determination of multiple targets in complicated aqueous matrices.

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Section: Adsorption Analysis and Recognition Selectivity Of Mt-mipssupporting

confidence: 49%

Multi-template imprinted polymers for simultaneous selective solid-phase extraction of six phenolic compounds in water samples followed by determination using capillary electrophoresis

Lü

Wang

et al. 2017

Journal of Chromatography A

122

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“…The results indicated that zeolite-DGT performed well within these concentrations range of cations. By comparison, the tolerance concentration limit of Mg 2+ in the current study is approximately 20 times higher than that of lake water [8], and for Al 3+ the upper concentration limit was about 300 times higher [28].…”

Section: Effects Of Cationsmentioning

confidence: 89%

“…The synthetic freshwater contained 1 mg N L −1 (NH 4 Cl) and was prepared according to Dong et al [8], with the composition available in Table S3 (see ESM). Three natural freshwater samples were collected from the surface of Hunhe river (Shenyang, China), the surface of Nanhu Lake (Shenyang, China) and the surface of Wanquan fishpond (Shenyang, China), respectively.…”

Section: Deployment In Synthetic Freshwater and Natural Watersmentioning

confidence: 99%

“…Binding layer is the most important part of DGT technique. Many kinds of sorbent were developed as the binding layer, such as Chelex 100 for 24 elements [9], ferrihydrite for 6 oxoanions [10,11], Sodium polyacrylate and polymer-bound Schiff base for Cu 2+ and Cd 2+ [12,13], molecularly imprinted polymer for 4-chlorophenol [8], polyquaternary ammonium salt for phosphorus [14], and so on. However, there has been little focus on DGT-measurement for nitrogen nutrition (ammonium).…”

Section: Introductionmentioning

confidence: 99%

“…(2)). The calculated concentration is an average concentration over the deployment period which can better represent the original level than instantaneous concentration, especially for concentrations with wide fluctuation [7,8]. Binding layer is the most important part of DGT technique.…”

Section: Introductionmentioning

confidence: 99%

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Sampling of ammonium ion in water samples by using the diffusive-gradients-in-thin-films technique (DGT) and a zeolite based binding phase

et al. 2015

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We have investigated the possibility of sampling ammonium ion using the diffusive-gradients-in-thin-films technique (DGT) by introducing a novel binding agent that is based on micro-sized zeolite. The performance of zeolite-DGT was characterized by measurement of the following parameters: (1) the diffusion coefficient of ammonium ion in hydrogel; (2) the adsorption rate of ammonium ion by the zeolite binding gel; (3) the elution efficiency, and (4) the effects of pH, ionic strength and interfering ions on DGT. The method was validated by studying the uptake of ammonium ion from in freshwaters by zeolite gels which was found to be fast enough to meet the requirements of DGT. The concentrations determined via DGT agreed well with the concentrations determined in bulk solutions. Sampling of ammonium ion using zeolite-DGT was consistent over the pH 3 to 8 range and the 0.001 to 10 mM ionic strength range. The method also performs predictably in natural waters containing various metal ions. The technique is considered to be a viable passive tool for sampling ammonium from aqueous solutions.

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Photoresponsive molecularly imprinted hydrogel casting membrane for the determination of trace tetracycline in milk

Wang

Tang

et al. 2015

J of Molecular Recognition

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This study aimed to develop a photoresponsive molecularly imprinted hydrogel (MIH) casting membrane for the determination of trace tetracycline (TC) in milk. This MIH casting membrane combined the specificity of MIHs, the photoresponsive properties of azobenzene, and the portable properties of a membrane. Photoresponsive TC-imprinted MIHs were initially fabricated and then cast on sodium dodecyl sulfonate polyacrylamide gel. After TC removal, a photoresponsive MIH casting membrane was obtained. The photoresponsive properties of the MIH casting membrane were robust, and no obvious photodegradation was observed after 20 cycles. The MIH casting membrane displayed specific affinity to TC upon alternate irradiation at 365 and 440 nm; it could quantitatively uptake and release TC. The TC concentration (0.0-2.0 × 10(-4) mol l(-1)) in aqueous solution displayed a linear relationship with the photoisomerization rate constant of azobenzene within the MIH casting membrane. As such, a quick detection method for trace TC in aqueous foodstuff samples was established. The recovery of this method for TC in milk was investigated with a simple pretreatment of milk, and a high recovery of 100.54-106.35% was obtained. Therefore, the fabricated membrane can be used as a portable molecular sensor that can be easily recycled.

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Sampling 4-chlorophenol in water by DGT technique with molecularly imprinted polymer as binding agent and nylon membrane as diffusive layer

Cited by 70 publications

References 55 publications

Multi-template imprinted polymers for simultaneous selective solid-phase extraction of six phenolic compounds in water samples followed by determination using capillary electrophoresis

Multi-template imprinted polymers for simultaneous selective solid-phase extraction of six phenolic compounds in water samples followed by determination using capillary electrophoresis

Sampling of ammonium ion in water samples by using the diffusive-gradients-in-thin-films technique (DGT) and a zeolite based binding phase

Photoresponsive molecularly imprinted hydrogel casting membrane for the determination of trace tetracycline in milk

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