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环境化学  2015 

大气PM2.5在线监测仪对SO42-、NO3-和NH4+的测定评价

Keywords: PM2.5在线监测系统,AIM,MARGA,NH4+,NO3-,SO42-

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Abstract:

通过两套大气细颗粒物(PM2.5)水溶性离子在线监测仪与蜂巢式固气分离器膜采样系统作对比,评估了在线监测仪器对主要水溶性组分SO42-、NO3-和NH4+的测定结果.美国URG公司生产的在线连续监测分析系统(AIMURG-9000B)对NH4+和NO3-的监测结果较好,但对SO42-的测定结果存在明显高估,其原因是AIM的平板溶蚀器系统无法完全去除大气中高浓度SO2,从而对SO42-的测定结果有干扰.为解决这一问题,进行了一系列实验,结果表明采用两个溶蚀器串联并用5mmol·L-1H2O2+5mmol·L-1NaOH混合溶液作吸收液时,高浓度的SO2(甚至达到260μg·m-3)可以被完全吸收而对SO42-的测定结果不产生影响.由荷兰能源研究所(ECN)、Metrohm和Applikon共同研制的在线气体组分及气溶胶监测系统(MARGA,ADI2080)对NH4+和SO42-的监测结果较好,可以满足实验要求;但NO3-的测定结果偏高,其准确性需作进一步评估.新型监测仪器在不同大气环境中投入使用前需进行对比测试,以确定其准确性和精确性.

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