优化了液相色谱法测定大气样品中多环芳烃(PAHs)的前处理净化手段,相较于弗洛里土柱,硅胶能有效去除仪器分析中目标物定性和定量分析的背景干扰.通过控制样品溶剂转换时浓缩体积,提高了低环数多环芳烃的回收率,各目标物的空白加标回收率在53％-128％之间(RSD＜20％).使用高效液相色谱(HPLC)二极管阵列/荧光检测器联用测定大气中的PAHs,当以100 L·min-1采样24 h时,16种PAHs的方法检出限为0.08-0.29 ng·m-3,定量下限为0.32-1.16 ng·m-3.通过对实际样品的测定,验证了方法的可行性.
A method was optimized for determination of polycyclic aromatic hydrocarbons (PAHs) in atmospheric samples by liquid chromatography (HPLC).Compared to florisil column,silica gel column had better purification effect,which effectively removed the background interference for target analysis.Furthermore,higher recovery of low rings number PAHs were obtained by controlling the solvent volume in the solvent conversion process.The recoveries of 16 PAHs in the spiked standard solutions ranged from 53％ to 128％ (RSD ＜ 20％).Using high performance liquid chromatography (HPLC) method and combined detectors was fluorescence detector (FLD) and diode array detector (DAD).The detection limits for the 16 PAHs were 0.08-0.29 ng· m-3,and the quantification limit were 0.32-1.16 ng· m-3 for the air samples collected at 100 L· min-1 sampling rate and 24 h sampling time.The results of several actual atmospheric samples confirmed the feasibility of this method.
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