气相色谱-质谱法测定地板材料中8种挥发性有机物质

摘要

应用气相色谱-质谱法测定了地板中甲苯、乙苯、邻二甲苯、间二甲苯、对二甲苯、苯乙烯、乙酸丁酯、正十一烷等8种挥发性有机物质的含量。地板样品（5 g）用甲醇（15 mL）超声提取20 min，所得提取液用 Rxi-5ms 毛细管色谱柱分离，在选择离子监测模式下测定。8种挥发性有机物质的质量浓度（间二甲苯与对二甲苯合并计算）均在0．5～10．0 mg·L-1范围内与其峰面积呈线性关系，方法的检出限（3S/N）在0．05～1．0 mg·L-1之间。加标回收率在98．0％～105％之间，测定值的相对标准偏差（n＝5）在2．3％～6．6％之间。%GC-MS was applied to the determination of 8 volatile organic compounds,i.e.toluene,ethyl benzene,o-xylene,m-xylene,p-xylene,styrene,butyl acetate and n-undecane in wooden or compound wooden floor.The sample (5 g)of floor board was extracted ultrasonically with methanol (15 mL)for 20 min.The extract was separated on Rxi-5ms capillary column,and determined under selected ion monitoring mode in MS.Linear relationships between values of peak area and mass concentration of the 8 volatile organic compounds (m-xylene and p-xylene were measured as cumulative total)were kept in the same range of 0.5 -10.0 mg·L-1 with detection limits (3S/N)in the range of 0.05-1.0 mg·L-1 .Values of recovery found by standard addition method were in the range of 98.0%-105%,and values of RSD′s (n=5)in the range of 2.3%-6.6%.