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首页> 外文期刊>The Analyst: The Analytical Journal of the Royal Society of Chemistry: A Monthly International Publication Dealing with All Branches of Analytical Chemistry >Highly stable magnetic multiwalled carbon nanotube composites for solid-phase extraction of linear alkylbenzene sulfonates in environmental water samples prior to high-performance liquid chromatography analysis
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Highly stable magnetic multiwalled carbon nanotube composites for solid-phase extraction of linear alkylbenzene sulfonates in environmental water samples prior to high-performance liquid chromatography analysis

机译：高效液相磁性碳纳米管复合材料，用于固相萃取环境水样品中的线性烷基苯磺酸盐，然后进行高效液相色谱分析

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The magnetic multiwalled carbon nanotubes (MMWCNTs) have been successfully prepared using a one-pot chemical coprecipitation method, in which magnetic nanoparticles (MNPs) were deposited onto multiwalled carbon nanotubes (MWCNTs) by in situ high temperature decomposition of the magnetic precursor of iron(iii) in ethylene glycol media. A novel procedure for extraction of linear alkylbenzene sulfonates (LAS) as a model compound was thus developed in an off-line extraction system with detection by HPLC. The procedure includes the separation and preconcentration of LAS homologues onto MMWCNTs at pH 7.0 and their subsequent detection after sonication elution, followed by the separation of the MMWCNTs from the aqueous phase by external magnetic field and washing with ultra pure water. With a sample volume of 500 mL and 100 mg MMWCNTs sorbents, an enrichment factor of about 500, and a detection limit of 0.013-0.021 μg L ~(-1) were obtained within a linear range of 0.5-100 μg L ~(-1), together with a correlation coefficient of 0.9938-0.9998 for four LAS homologues. A precision of 2.4-5.6% was obtained for six replicate determinations of 50 μg L ~(-1) LAS. The recoveries of LAS homologues spiked in environmental water samples ranged from 87.3 to 106.3%, demonstrating the utility of the MMWCNTs adsorbents in a series of water samples. Stability testing demonstrated that the MMWCNTs remained 95.0% recovery for the target LAS even after a run of 50 adsorption and desorption cycles, showing their super operational stability. The MMWCNTs are promising adsorbents, suitable for the long-term repetitive sorption/desorption of target compounds in environmental water samples. This journal is
机译：使用一锅化学共沉淀法成功制备了磁性多壁碳纳米管（MMWCNT），其中通过铁的磁性前体的原位高温分解将磁性纳米颗粒（MNP）沉积在多壁碳纳米管（MWCNT）上。 iii）在乙二醇介质中。因此，在离线萃取系统中开发了一种用于萃取线性烷基苯磺酸盐（LAS）作为模型化合物的新方法，并通过HPLC检测。该程序包括将LAS同源物分离并预浓缩到pH 7.0的MMWCNT上，并在超声洗脱后对其进行后续检测，然后通过外部磁场从水相中分离MMWCNT，并用超纯水洗涤。在500 mL样品体积和100 mg MMWCNTs吸附剂的情况下，在0.5-100μgL〜（-）的线性范围内获得的富集系数约为500，检测极限为0.013-0.021μgL〜（-1）。 1），以及四个LAS同源物的相关系数0.9938-0.9998。六次重复测定50μgL〜（-1）LAS的精密度为2.4-5.6％。在环境水样中加标的LAS同源物的回收率为87.3％至106.3％，这表明MMWCNTs吸附剂在一系列水样中的效用。稳定性测试表明，即使经过50个吸附和解吸循环，MMWCNT仍可保留目标LAS 95.0％的回收率，显示出其超强的操作稳定性。 MMWCNT是有希望的吸附剂，适用于环境水样品中目标化合物的长期重复吸附/解吸。这本日记是

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