Articles | Volume 14, issue 2
Research article
18 Feb 2021
Research article |  | 18 Feb 2021

Effects of multi-charge on aerosol hygroscopicity measurement by a HTDMA

Chuanyang Shen, Gang Zhao, and Chunsheng Zhao

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Cited articles

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Short summary
Aerosol hygroscopicity measured by the humidified tandem differential mobility analyzer (HTDMA) is affected by multiply charged particles from two aspects: (1) number contribution and (2) the weakening effect. An algorithm is proposed to do the multi-charge correction and applied to a field measurement. Results show that the difference between corrected and measured size-resolved κ can reach 0.05, highlighting that special attention needs to be paid to the multi-charge effect when using HTDMA.