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顶空-气相色谱质谱联用法测定热熔胶中的苯及苯系物

Determination of benzene and its homologues in hot melt adhesives by headspace gas chromatography-mass spectrometry

  • 摘要: 为准确测定热熔胶中苯及苯系物的含量,通过对顶空进样条件、气相色谱条件和质谱参数进行考察和优化,建立了一种用顶空-气相色谱质谱联用仪(HS-GC/MS)测定热熔胶中苯及苯系物(苯、甲苯、乙苯、对-二甲苯、间-二甲苯、邻-二甲苯和苯乙烯)的方法,并采用该方法测定了15个热熔胶样品。结果表明:①优化确定的实验条件为,0.20 g剪碎的热熔胶样品,加入1 mL含氘代苯内标(0.10 mg/L)的三乙酸甘油酯(基质校正剂),140℃下平衡30 min后顶空进样,采用键合/交联聚乙醇毛细管色谱柱在选择离子监测模式下进行GC/MS分析。②苯及苯系物的检出限在0.01~0.03 mg/kg之间,精密度和回收率分别为1.29%~3.45%和94.1%~99.9%。③15个热熔胶样品中苯及苯系物均有不同程度检出,苯的检出率为13.3%,检出量0.03~0.04 mg/kg;甲苯、乙苯、对-二甲苯、间-二甲苯和邻-二甲苯的检出率均为100%,检出量分别为0.09~3.71、0.15~0.29、0.09~0.29、0.16~0.50和0.15~0.47 mg/kg;苯乙烯检出率86.7%,检出量0.14~0.71 mg/kg。该方法前处理简单、结果准确可靠,适用于热熔胶中苯及苯系物的常规检测。

     

    Abstract: For accurate quantification of benzene and its homologues (toluene, ethylbenzene, p-xylene, m-xylene, o-xylene and styrene) in hot melt adhesives, a headspace gas chromatography-mass spectrometry (HS-GC/MS) method was established. Experiments were performed to optimize the conditions and parameters of headspace sampling, and GC/MS parameters. Fifteen samples of hot melt adhesives were analyzed with the established method. The results showed that:1) The optimized experimental conditions used 0.20 g samples of hot melt adhesives, followed by extraction in 1 mL glyceryl triacetate (matrix correction agent) with deuterated benzene internal standard (0.10 mg/L) addition. 2) The limits of detection for benzene and its homologues were 0.01-0.03 mg/kg. The precision of method ranged from 1.29% to 3.45% with the recoveries from 94.1% to 99.9%. 3) The levels of benzene and its homologues determined in the 15 samples varied. The detection rate of benzene was 13.3% with the level ranged from 0.03 to 0.04 mg/kg. The detection rates of toluene, ethylbenzene, p-xylene, m-xylene and o-xylene reached 100% with the levels ranged from 0.09 to 3.71, 0.15 to 0.29, 0.09 to 0.29, 0.16 to 0.50 and 0.15 to 0.47 mg/kg, respectively. The detection rate of styrene was 86.7% with the level ranged from 0.14 to 0.71 mg/kg. This method is simple, accurate, reliable and suitable for the routine determination of benzene and its homologues in hot melt adhesives.

     

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