Department of Chemistry, Faculty of Science, University of Girona, Girona, Spain.
J Sep Sci. 2010 Sep;33(17-18):2833-40. doi: 10.1002/jssc.201000213.
A needle trap (NT) device filled with Carbopack X as a sorbent material is evaluated for the static headspace analysis of benzene, toluene, ethylbenzene, and xylene (BTEX) compounds in aqueous samples. Injection parameters used with the NT device (e.g. volume of carrier gas and time to open the split valve) are evaluated to determine the mechanism involved during the desorption and transferring of the target compounds into the GC column. Furthermore, different parameters affecting the adsorption capacity of the sorbent are studied (e.g. sampling time and temperature, headspace/sample volume ratio, salting-out, and stirring). The evaluation of the method with aqueous samples shows that repeatability and recoveries with the NT device are equivalent to those obtained using solid-phase microextraction with a carboxen/PDMS (CAR/PDMS) coating. LODs obtained with flame ionization detection are in the range of 10-25 μg/L, and in the range of hundredths of μg/L with MS detection. The method developed is satisfactorily applied to the analysis of aqueous samples obtained from wastewater treatment plants.
一种填充有 Carbopack X 作为吸附材料的针阱（NT）装置，用于静态顶空分析苯、甲苯、乙苯和二甲苯（BTEX）化合物在水样中的含量。评估了与 NT 装置一起使用的进样参数（例如载气体积和打开分流阀的时间），以确定在目标化合物解吸并转移到 GC 柱的过程中涉及的机制。此外，研究了影响吸附剂吸附容量的不同参数（例如采样时间和温度、顶空/样品体积比、盐析和搅拌）。用水样评估该方法的结果表明，NT 装置的重复性和回收率与使用 CAR/PDMS （羧基/聚二甲基硅氧烷）涂层的固相微萃取获得的结果相当。火焰离子化检测的检出限范围为 10-25μg/L，而 MS 检测的检出限范围为μg/L 的百分之一。开发的方法可满意地应用于从污水处理厂获得的水样的分析。
