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首页> 外文期刊>Analytica chimica acta >Preparation of polydimethylsiloxane/beta-cyclodextrin/divinylbenzene coated 'dumbbell-shaped' stir bar and its application to the analysis of polycyclic aromatic hydrocarbons and polycyclic aromatic sulfur heterocycles compounds in lake water and soil by high performance liquid chromatography
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Preparation of polydimethylsiloxane/beta-cyclodextrin/divinylbenzene coated 'dumbbell-shaped' stir bar and its application to the analysis of polycyclic aromatic hydrocarbons and polycyclic aromatic sulfur heterocycles compounds in lake water and soil by high performance liquid chromatography

机译：聚二甲基硅氧烷/β-环糊精/二乙烯基苯包覆的“哑铃形”搅拌棒的制备及其在高效液相色谱法分析湖水和土壤中多环芳烃和多环芳族硫杂环化合物中的应用

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摘要

A "dumbbell-shaped" stir bar was proposed to prevent the friction loss of coating during the stirring process, and thus prolonged the lifetime of stir bars. The effects of the coating components, including polydimethylsiloxane (PDMS), beta-cyclodextrin (beta-CD) and divinylbenzene (DVB) were investigated according to an orthogonal experimental design, using three polycyclic aromatic hydrocarbons (PAHs) and four polycyclic aromatic sulfur heterocycles (PASHs) as model analytes. Four kinds of stir bars coated with PDMS, PDMS/beta-CD, PDMS/DVB and PDMS/beta-CD/DVB were prepared and their extraction efficiencies for the target compounds were compared. It was demonstrated that PDMS/beta-CD/DVB-coated stir bar showed the best affinity to the studied compounds. The preparation reproducibility of PDMS/beta-CD/DVB-coated stir bar ranged from 3.2% to 15.2% (n = 6) in one batch, and 5.2% to 13.4% (n = 6) among batches. The "dumbbell-shaped" stir bar could be used for about 40 times, which were 10 extractions more than a normal stir bar. The prepared PDMS/beta-CD/DVB-coated "dumbbell-shaped" stir bar was used for stir bar sorptive extraction (SBSE) of PAHs and PASHs and the desorbed solution was introduced into HPLC-UV for subsequent analysis. The limits of detection of the proposed method for seven target analytes ranged from 0.007 to 0.103 mu g L~(-1) , the relative standard deviations were in the range of 6.3-12.9% (n = 6, c=40 mu g L~(-1)). and the enrichment factors were 19-86. The proposed method was successfully applied to the analysis of seven target analytes in lake water and soil samples.
机译：为了防止涂层在搅拌过程中的摩擦损失，提出了一种“哑铃形”的搅拌棒，从而延长了搅拌棒的使用寿命。根据正交实验设计，使用三个多环芳烃（PAH）和四个多环芳硫杂环，研究了涂料组分（包括聚二甲基硅氧烷（PDMS），β-环糊精（β-CD）和二乙烯基苯（DVB））的作用（ PASH）作为模型分析物。制备了四种涂覆有PDMS，PDMS /β-CD，PDMS / DVB和PDMS /β-CD/ DVB的搅拌棒，并比较了它们对目标化合物的提取效率。结果表明，PDMS /β-CD/ DVB涂层的搅拌棒对研究的化合物表现出最佳的亲和力。涂有PDMS /β-CD/ DVB的搅拌棒的制备重现性在一批中为3.2％至15.2％（n = 6），在批中为5.2％至13.4％（n = 6）。 “哑铃形”搅拌棒可使用约40次，比普通搅拌棒多提取10次。将制备的PDMS /β-CD/ DVB涂层的“哑铃形”搅拌棒用于PAH和PASH的搅拌棒吸附萃取（SBSE），并将解吸的溶液引入HPLC-UV中进行后续分析。该方法对7种目标分析物的检出限为0.007至0.103μgL〜（-1），相对标准偏差为6.3-12.9％（n = 6，c = 40μgL. 〜（-1））。富集因子为19-86。该方法已成功应用于湖泊水和土壤样品中七种目标分析物的分析。

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