气相色谱–质谱法测定木材中的五氯苯酚

Determination of pentachlorophenol in wood by gas chromatography–mass spectrometry

建立采用气相色谱-质谱法检测木材中五氯苯酚含量的方法.用甲醇为萃取溶剂超声提取木材中五氯苯酚,以气相色谱-质谱仪进行定量分析.五氯苯酚的质量浓度X在0.025~2.0 mg/L范围内与其色谱峰面积Y呈良好的线性关系,线性回归方为Y=394.4X-8435,线性相关系数r2为0.999,检出限为0.03 mg/kg.在20,40,125μg/L加标水平下,样品加标回收率为94.1%~101.8%,测定结果的相对标准偏差为0.90%~2.13%(n=6).该方法的样品前处理简单,不需要衍生化,具有较高的准确度与精密度,可用于木材中五氯苯酚的测定.

A method for determination of pentachlorophenol in wood by gas chromatography–mass spectrometry(GC–MS) was established. Methanol was used as extraction solvent for extraction,and then pentachlorophenol was detected quantitatively by GC–MS. The mass concentration of pentachlorophenol had good linear relationship with the chromatographic peak area in the range of 0.025–2.0 mg/L,the linear equation was Y=394.4X–8 435,the correlation coefficient was 0.999,and the detection limit was 0.03 mg/kg. Under the 20,40,125 μg/L addition level,the recovery was 94.1%–101.8%,and the relative standard deviation of determination results was 0.90%–2.13%(n=6). The method is simple in sample pretreatment and does not require derivatization with high accuracy and precision, and it can be used for the determination of pentachlorophenol in wood.