On-line measurement of perchlorate in atmospheric aerosol based on ion chromatograph coupled with particle collector and post-column concentrator

► The automated system was developed for measuring ClO4− in atmospheric aerosol. ► The sensitivity was increased 7.7 times with the post-column concentration technique. ► The system provided the ClO4− concentration every 3 h with the LOD of 0.35 ng/m3.