固相微萃取-气相色谱法测定塑料食品包装袋中的痕量挥发性有机物

Determination of Trace Volatile Organic Compounds in Packing Films by Solid-phase Microextraction/Gas Chromatograph (SPME/GC)

中文关键词:  固相微萃取(SPME)  聚丙烯酸树脂涂层  痕量有机物  塑料制品

英文关键词:solid-phase microextraction  polyacrylate coating  trace organic compounds  plastic

中文摘要:

      采用固相微萃取与气相色谱联用技术,对塑料制品—保鲜薄膜、牛奶包装袋中的痕量挥发性有机物异丙醇、乙酸乙酯、丁酮、甲苯进行定量测定.该方法的线性范围大于10²数量级,检出限低于4.4ng/mL水平,相对标准偏差为2.3%～4.7%.方法灵敏度高、重现性较好.

英文摘要:

      As a new preparation technique, solid-phase microextraction(SPME) focus sampling, extraction, concentrating and desorption in one simple step. SPME is a solvent-free, rapid, inexpensive and field usable technique, in which analytes are adsorbed from an aqueous sample onto a phase-coated fused silica fiber. The fiber is then inserted directly into the GC injection port for thermal desorption. SPME is combined with GC for determination of trace volatile organic compounds in packing films, including isopropanol, ethyl acetate, butanone and toluene. Linear rang is found to be more than 10² level. Limits of detection are below 4.44 ng/mL and the precision are from 2.3%～4.7%. The method has higher sensitivity and better repeatability.