【摘要】 近年来,以RDX为代表的痕量爆炸物检测已经是反恐斗争和国土安全领域的重要课题[1]。本实验将醋酸作为辅助试剂直接添加到待分析水样中,采用电喷雾电离直接进样,在正离子检测模式下,建立了直接快速测定水样中衡量RDX的电喷雾质谱分析方法。在样品流量为10.0μL/m in,喷雾电压为5.0 kV,毛细管温度为200℃条件下获得的RDX的检出限为0.001μg/L,线性范围为0.005~100μg/L。对天然湖水、矿泉水和自来水中添加的衡量RDX的回收率分别在92%~108%之间。单个样品分析(含串联质谱分析)所需时间不超过2 m in。更多还原

【Abstract】 Rapid detection of trace amount of explosives such as cyclotrimethylene trinitramine(RDX) is of increasing interest in recent years,and of extreme importance in homeland security program.In this study,RDX in various aqueous samples were detected directly by electrospray mass spectrometry(ESI-MS) in the positive ion detection mode by using(acetic) acid to promote protonation of RDX in water solution.Under the optimized working conditions: sample flow rate,10.0 μL/min;spray voltage,6 kV;capillary temperature,200℃,a detection limit of 1 ng/L was achieved with minimum sample preparation and direct infusion at(10 μL/min);the dynamic linear range of this method was found to be 0.005-100 g/L;the recovery of RDX in spring water,tap water and lake water was 92%,99% and 108%,respectively.The procedure took less than 2 min to get analytical results of a single sample with high confidence by performing tandem MS analysis to avoid false positives.更多还原