采用静态顶空气相色谱法对涂料与胶粘剂中的苯、甲苯和二甲苯3种苯系物的含量进行测定,最佳气液相平衡条件:气液相比2∶1,平衡温度70 ℃,平衡时间20 min.从顶空样瓶顶部取气体样品50 μL进样作气相色谱测定.苯、甲苯和二甲苯质量浓度在100~1 000 mg·L-1范围内与峰面积呈线性关系,平均回收率在99.3%~101.7%范围内,相对标准偏差(n=5)为1.6%~4.7%,检出限分别为0.074,0.106,1.292 mg·L-1.

Benzene homologues (benzene,toluene and xylene were tested in special) in paint and adhesive were determined by gas chromatography. Fifty μL of the gaseous analyte were taken from the top of the head-space sample bottle,in which an appropriate amount of the sample was added together with pure water to have the volume ratio of gas to liquid phase achieved to 2 to 1,and equilibrated statically at 70 ℃ for 20 min under hermetic condition,and were introduced into the GC instrument. Linear relationships between values of peak area and mass concentration of benzene,toluene or xylene were kept in the range from 100 to 1 000 mg·L-1. Detection limits (3S/N) for the 3 compounds found were 0.074,0.106 and 1.292 mg·L-1 respectively. Recovery and precision of the method were tested by analyzing a known paint sample with addition of mixed standard solution at 3 different concentration levels,and determining each for 5 replications,values of average recovery obtained were in the range of 99.3%-101.7%,and values of RSD′s (n=5) in the range from 1.6% to 4.7%.