GC-MS法测定塑胶跑道面层中的6种有害物质

建立了检测塑胶跑道面层中6种有害物质(环己基异氰酸酯(CHI)、2,4-甲苯二异氰酸酯(2,4-TDI)、2,6-甲苯二异氰酸酯(2,6-TDI)、六亚甲基二异氰酸酯(HDI)、萘-1,5-二异氰酸酯(NDI)和4,4'-二苯基甲烷二异氰酸酯(4,4'-MDI))含量的GC-MS检测方法,分别讨论了定量方式和萃取时间对6种有害物质回收率的影响。将样品剪碎至10~20目(0.85~2.00 mm)的颗粒,用10 mL乙酸乙酯萃取,室温下超声20 min,提取液用DB-17MS石英毛细管色谱柱(30 m×0.25 mm×0.25μm)分离,采用GC-MS法并选择离子检测,内标法定量。结果表明,在0.5~100.0 mg/L(4,4'-MDI在1.0~100.0 mg/L)浓度范围内,线性良好,相关系数均大于0.998,方法检出限范围为2.0~10.0 mg/kg,定量限范围为6.0~20.0 mg/kg;加标平均回收率在80.1%~100.8%之间,相对标准偏差(n=6)小于5.2%。该方法快速、准确,适用于塑胶跑道面层中有害物质的测定。

Determination of 6 Harmful Substances in Surface Layer of Plastic Runway by Gas Chromatography-Mass Spectrometry

A method was developed for the determination of 6 harmful substances(cyclohexyl isocyanate(CHI),2,4-toluene diisocyanate(2,4-TDI),2,6-toluene diisocyanate(2,6-TDI),hexamethylene diisocyanate(HDI),naphthalene-1,5-diisocyanate(NDI)and 4,4'-diphenylmethane diisocyanate(4,4'-MDI))in surface layer of plastic runway by gas chromatography-mass spectrometer(GC-MS).The effects of recovery of 6 harmful substances by different quantitative methods and extraction time were discussed,respectively.The samples were cut to 20 to 10 meshe sieve(0.85~2.00 mm),extracted with 10 mL ethyl acetate for 20 min at room temperature.The samples were separated into DB-17MS quartz capillary column(30 m×0.25 mm×0.25μm).The samples were separated by GC-MS and quantified by internal standard method.The results showed that the correlation coefficientsr were more than 0.998,in the range of 0.5~100.0 mg/L(4,4'-MDI,0.5~100.0 mg/L).The limits of detection(LODs)were 2.0~10.0 mg/kg,the limits of quantitation(LOQs)were 6.0~20.0 mg/kg.The average recovery rate ranged from 80.1%to 100.8%,and the relative standard deviations(n=6)were less than 5.2%.This method could be suitable for the determination of harmful substances in surface layer of plastic runway rapidly and accurately.