A polyethyleneimine (PEI)-modified attapulgite was employed as a new adsorbent for solid-phase extraction (SPE) of chlorophenols (CPs) from environmental water samples. Key factors pivotal to extraction efficiency, such as organic additive, pH, salt, sample loading volume, elution volume, and sample loading flow rate, were investigated. The maximum adsorption capacity of CPs reached 38 mg/g, and the adsorption behavior could be described with the Langmuir isotherm model. The developed SPE procedure was then tested on river water samples. Of this cartridge, 0.4 g could be used to treat up to 100 mL of the water sample, with high recoveries achieved. The limit of detection (S/N = 3) and the limit of quantification (S/N = 10) were in range of 0.08–0.56 and 0.27–1.88 ng/mL, respectively. The mean recoveries of CPs spiked in river water samples ranged from 84.4 to 96.8% with relative standard deviations for the intra-day and inter-day less than 6.30%. The developed SPE method exhibited high sensitivity, high selectivity, excellent accuracy, and good repeatability to the analysis of trace CPs in complicated aqueous matrices.

中文翻译：

---

聚乙烯亚胺改性凹凸棒土在环境水样中痕量氯酚固相萃取中的应用

聚乙烯亚胺（PEI）改性的凹凸棒石被用作从环境水样品中固相萃取氯酚（CP）的新型吸附剂。研究了影响萃取效率的关键因素，例如有机添加剂，pH，盐，样品上样量，洗脱量和样品上样流速。CP的最大吸附容量达到38 mg / g，可以用Langmuir等温线模型描述其吸附行为。然后在河水样品上测试开发的SPE程序。在该小柱中，可使用0.4 g的样品处理多达100 mL的水样品，并实现了高回收率。检测限（S / N  = 3）和定量限（S / N = 10）的范围分别为0.08-0.56和0.27-1.88 ng / mL。在河水样品中加标的CP的平均回收率在84.4％至96.8％之间，日内和日间相对标准偏差小于6.30％。所开发的SPE方法对复杂水性基质中痕量CP的分析显示出高灵敏度，高选择性，优异的准确性和良好的重现性。