Carbotrap B as a highly pure surface sorbent with excellent adsorption/desorption properties was packed into a stainless steel needle to develop a new needle trap device (NTD). The performance of the prepared NTD was investigated for sampling, pre-concentration and injection of benzene, toluene, ethyl benzene, o-xylene, and p-xylene (BTEX) into the column of gas chromatography-mass spectrometry (GC–MS) device. Response surface methodology (RSM) with central composite design (CCD) was also employed in two separate consecutive steps to optimize the sampling and device parameters. First, the sampling parameters such as sampling temperature and relative humidity were optimized. Afterwards, the RSM was used for optimizing the desorption parameters including desorption temperature and time. The results indicated that the peak area responses of the analytes of interest decreased with increasing sampling temperature and relative humidity. The optimum values of desorption temperature were in the range 265–273° C, and desorption time were in the range 3.4–3.8 min. The limits of detection (LODs) and limits of quantitation (LOQs) of the studied analytes were found over the range of 0.03–0.04 ng/mL, and 0.1–0.13 ng/mL, respectively. These results demonstrated that the NTD packed with Carbotrap B offers a high sensitive procedure for sampling and analysis of BTEX in concentration range of 0.03–25 ng/mL in air.

将具有优异吸附/解吸性能的高纯度表面吸附剂Carbotrap B装入不锈钢针头中，以开发新的针头捕集器（NTD）。研究了制备的NTD的性能，可用于苯，甲苯，乙苯，邻二甲苯和p的取样，预浓缩和进样-二甲苯（BTEX）进入气相色谱-质谱（GC-MS）装置的色谱柱。响应面方法（RSM）和中央复合设计（CCD）也被用于两个单独的连续步骤中，以优化采样和设备参数。首先，优化采样参数，例如采样温度和相对湿度。之后，使用RSM来优化解吸参数，包括解吸温度和时间。结果表明，感兴趣的分析物的峰面积响应随采样温度和相对湿度的增加而降低。解吸温度的最佳值在265–273°C范围内，解吸时间在3.4–3.8 min的范围内。所研究分析物的检出限（LOD）和定量限（LOQ）分别在0.03-0.04 ng / mL和0.1-0.13 ng / mL的范围内。这些结果表明，装有Carbotrap B的NTD为空气中0.03–25 ng / mL浓度范围内的BTEX采样和分析提供了高灵敏度的程序。