顶空气相色谱法测定聚苯乙烯制品中苯乙烯和乙苯残留量  

Determination of Styrene and Ethylbenzene Residues in Polystyrene Products by Headspace Gas Chromatography

作　　者：苏淑坛 兰丽丽 章海涛 刘怡东 吴毅宁 蒋小良 SU Shu-Tan;LAN Li-Li;ZHANG Hai-Tao;LIU Yi-Dong;WU Yi-Ning;JIANG Xiao-Liang(Center Testing Certificate Co.,Ltd.Guangdong,Jiangmen 529000;Guangzhou Customs Technology Center,Guangzhou 510623;Jiangmen Customs Technology Center,Jiangmen 529000)

机构地区：[1]中德认证检测(广东)有限公司,江门529000 [2]广州海关技术中心,广州510623 [3]江门海关技术中心,江门529000

出　　处：《中国口岸科学技术》2023年第2期62-66,共5页China Port Science and Technology

摘　　要：本研究以二氯甲烷为溶剂,采用顶空气相色谱法测定聚苯乙烯制品中苯乙烯和乙苯残留量,考察了样品前处理溶剂的选择,以及顶空进样平衡温度和平衡时间。实验结果显示,顶空平衡温度为100℃、平衡时间为15 min时,苯乙烯和乙苯响应值达到最佳。在选择的最佳条件下,以外标法定量建立标准工作曲线,苯乙烯和乙苯的线性范围为0~20 mg/L,相关系数均大于0.999,检出限均为1 mg/kg;进行了不同浓度的加标回收率试验,苯乙烯加标回收率为97.3%~107.7%,乙苯加标回收率在92.3%~102.4%之间,相对标准偏差均小于3.6%。实验结果表明,该方法具有准确度高、精密度好、干扰小等优点,适合聚苯乙烯制品中苯乙烯和乙苯残留量的快速检测。A method for the determination of styrene and ethylbenzene residues in polystyrene products by headspace gas chromatography with dichloromethane as solvent was studied. The selection of sample pretreatment solvent, the equilibrium temperature and time of headspace injection were investigated. The test results showed that the response value of styrene and ethylbenzene reached the best when the headspace equilibrium temperature was 100℃ and the equilibrium time was 15 min. Under the optimal conditions, the external standard method was used to quantitatively establish the standard working curve. The linear range of styrene and ethylbenzene was 0-20 mg/L, and all the correlation coefficients were greater than 0.999, with detection limit 1 mg/kg. The spiked recoveries of styrene and ethylbenzene at different concentrations were 97.3%-107.7% and 92.3%-102.4% respectively, with relative standard deviations less than 3.6%. The experimental results show that the method has the advantages of high accuracy, good precision and small interference, and is suitable for rapid detection of styrene and ethylbenzene residues in polystyrene products.

关 键 词：聚苯乙烯制品 顶空气相色谱法 苯乙烯 乙苯 

分 类 号：TQ325.2[化学工程—合成树脂塑料工业] O657.71[理学—分析化学]