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首页> 外文期刊>Environmental Monitoring and Assessment >Extraction of ultra traces of polychlorinated biphenyls in aqueous samples using suspended liquid-phase microextraction and gas chromatography-electron capture detection
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Extraction of ultra traces of polychlorinated biphenyls in aqueous samples using suspended liquid-phase microextraction and gas chromatography-electron capture detection

机译：悬浮液相微萃取-气相色谱-电子捕获检测法萃取水样中痕量多氯联苯

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摘要

This study reports the feasibility of applying directly suspended liquid-phase microextraction (DSLPME)-gas chromatography detection for the pre-concentration and determination of low levels of eight polychlorinated biphenyls (PCBs) in aqueous samples. The technique requires minimal sample preparation, analysis time and solvent consumption and represents significant advantages over conventional analytical methods. The experimental parameters such as salt content, sample temperature, stirring rate, extraction time, micro-drop volume and breakthrough volume were investigated and found to have significant influences on DSLPME. Under the optimal experimental conditions, the enrichment factor ranged from 578 to 729, and the recovery was above 93 %. Calibration curves possessed good linearity (R~2>0.99) over a wide concentration range of 0.1—10.0 μg L-1 with limits of detection ranging from 0.01 to 0.07 μg L-. The relative standard deviations for 1.0 μg L-1 of PCBs in water by using internal standard were in the range 2-14 % (n=3). The proposed simple, accurate and sensitive analytical method was applied successfully to the determination of trace amounts of PCBs in water samples.
机译：这项研究报告了应用直接悬浮液相微萃取（DSLPME）气相色谱检测法对水溶液样品中的八种多氯联苯（PCB）进行预浓缩和低含量测定的可行性。该技术需要最少的样品制备，分析时间和溶剂消耗，与常规分析方法相比具有明显的优势。研究了盐含量，样品温度，搅拌速度，提取时间，微滴体积和突破体积等实验参数，发现它们对DSLPME有重要影响。在最佳实验条件下，富集系数为578〜729，回收率在93％以上。校准曲线在0.1–10.0μgL-1的宽浓度范围内具有良好的线性（R〜2> 0.99），检出限为0.01至0.07μgL-。使用内标物，水中多氯联苯的1.0μgL-1的相对标准偏差在2-14％的范围内（n = 3）。所提出的简单，准确，灵敏的分析方法已成功应用于水样中痕量多氯联苯的测定。

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