热解析-气相色谱法测定印刷品中总挥发性有机化合物释放量

Determination of total volatile organic compounds in printed matter by thermal desorption-gas chromatography

建立用气袋法收集整册印刷品释放的挥发性有机化合物,热解析-气相色谱法检测总挥发性有机化合物(TVOC)的方法。将印刷品样品置入充满高纯氮气的密封PVF采样袋中,在35℃下放置12 h后,用采样器串联Tenax-TA采样管和采样袋,让袋内气体通过采样管,样品释放出的有机化合物被吸附到采样管的吸附剂上。用热解析-气相色谱法测试采样管中挥发性有机化合物的含量,其中苯、甲苯、邻二甲苯、间二甲苯、对二甲苯、乙苯、乙酸丁酯、苯乙烯和正十一烷按外标法定量,其它物质按甲苯标准曲线定量。该方法的加标回收率为74.4%~91.1%,测定结果的相对标准偏差不大于10%(n=9)。该方法的样品采集更贴近印刷品的实际生活场景,可以为评价印刷品挥发性有机物释放对人体健康的影响提供数据基础,为相关评价提供新思路。

Volatile organic compounds released from full volume printed matters were collected by PVF bag,and determined by thermal desorption-gas chromatography.The printed sample was placed in a sealed PVF sampling bag filled with high purity nitrogen,after being placed at 35℃for 12 h,Tenax-TA sampling tube and sampling bag were connected in series with a sampler,the air in the bag was passed through the sampling tube,and the organic compounds released from the sample were adsorbed on the adsorbent of the sampling tube.The contents of volatile organic compounds in sampling tubes were determined by thermo desorption-analytical gas chromatography.Benzene,toluene,o-xylene,m-xylene,p-xylene,ethylbenzene,butyl acetate,styrene and n-undecanone were quantified by external standard method,and other substances were quantified as toluene.The recovery of the method was 74.4%-91.1%,and the relative standard deviation of determination results was not more than 10%(n=9).The sample collection is more similar to the real life,which can provide data for evaluating the impact of volatile organic compounds(VOCs)released from printed matter,and provide new ideas for related evaluation.