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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 >Preparation of cation-exchange stir bar sorptive extraction based on monolithic material and its application to the analysis of soluble cations in milk by ion chromatography
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Preparation of cation-exchange stir bar sorptive extraction based on monolithic material and its application to the analysis of soluble cations in milk by ion chromatography

机译：基于整体材料的阳离子交换搅拌棒吸附萃取物的制备及其在离子色谱法分析牛奶中可溶性阳离子中的应用

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摘要

In this study, a new cation-exchange coating for stir bar sorptive extraction (SBSE) based on poly (acrylic acid-ethylene dimethacrylate) monolithic material was synthesized. The effect of polymerization conditions such as the ratio of functional monomer to cross-linker and the content of porogenic solvent on the extraction efficiencies were investigated in detail. The monolithic material was characterized by elemental analysis, scanning electron microscopy and infrared spectroscopy. In order to evaluate the usability of the new coating for the extraction of inorganic cations, the analysis of soluble K~+, Mg~(2+) and Ca~(2+) in milk by ion chromatography with conductivity detection was selected as a paradigm. Several extractive parameters, including pH value in sample matrix, desorption solvent, extraction and desorption time were optimized. Under the optimum conditions, low detection limits (S/N = 3) and quantification limits (S/N = 10) of the proposed method for the target cations were achieved within the range of 0.12-0.28 and 0.4-0.92 μg L~(-1), respectively. The method also showed good linearity, simplicity, practicality and low cost for the extraction of inorganic cations. Finally, the proposed method was successfully used to analyse three different trademarks of commercial milk samples with satisfactory recoveries in the range of 71.1% to 102.8%.
机译：在这项研究中，基于聚丙烯酸（丙烯酸-二甲基丙烯酸乙烯酯）整体材料合成了一种新型的搅拌棒吸附萃取（SBSE）阳离子交换涂料。详细研究了聚合条件如功能性单体与交联剂的比例和成孔溶剂的含量对萃取效率的影响。通过元素分析，扫描电子显微镜和红外光谱对整体材料进行了表征。为了评估该新型涂料用于提取无机阳离子的可用性，选择了采用电导检测的离子色谱法对牛奶中的可溶性K〜+，Mg〜（2+）和Ca〜（2+）进行分析。范例。优化了几个萃取参数，包括样品基质中的pH值，解吸溶剂，萃取和解吸时间。在最佳条件下，该方法对目标阳离子的检测限（S / N = 3）和定量限（S / N = 10）在0.12-0.28和0.4-0.92μgL〜（ -1）。该方法还具有良好的线性度，简便性，实用性和低成本。最终，该方法成功地用于分析商品奶样品中的三种不同商标，回收率在71.1％至102.8％之间，令人满意。

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