气相色谱-质谱法测定塑料书皮中17种增塑剂的含量

GC-MS Determination of 17 Plasticizers in Plastic Book Covers

采用气相色谱-质谱法测定塑料书皮中17种增塑剂的含量。取经剪碎至5mm×5mm的碎片样品（1.000g）置于索氏抽提器中，用二氯甲烷120mL，在60℃索氏提取6h。将提取液在50℃旋转蒸发至剩下约10mL，冷却，将提取液用二氯甲烷定容至25mL，以下按仪器工作条件进行气相色谱-质谱分析。在气相色谱分离中用DB-5MS毛细管柱为固定相，在质谱分析中采用选择离子监测模式。17种增塑剂的质量浓度均在0．10-10．0mg·L^-1之间与其峰面积呈线性关系，方法的检出限（3S／N）在0．13-0.96mg·kg^-1之间。以空白样品为基体进行加标回收试验，所得回收率在87．7％-110％之间，测定值的相对标准偏差（n=6）在2．6%-6．3%之间。

GC-MS was applied to the determination of 17 plasticizers in plastic book cover. A portion of sliced sample strips （5 mm）〈5 mm, 1. 000 g） was extracted with 120 mL of CH2C12 in a Soxhlet apparatus at 60℃ for 6 h. The extract was evaporated at 50℃ to about 10 mL in a rotating evaporator, and after cooling, the volume of the extract was made up to 25 mL with CH2Cl2. The solution was used for GC-MS analysis under the prescribed conditions. The DB-SMS capillary column was used for GC separation and the selected ion monitoring mode was adopted in MS determination. Linear relationships between values of peak area and mass concentration of the 17 plasticizers were kept in the same range of 0. 10-10. 0mg·L^-1 , with detection limits （3S/N） in the range of 0.13-0.96 mg·kg^-1. On the base of blank sample, test for recovery was made by standard addition method; values of recovery found were in the range of 87. 7%-110%, with RSD＇s （n=6） in the range of 2. 6%-6.3%.