Development and validation of a NOx+ ratio method for the quantitative separation of inorganic and organic nitrate aerosol using a unit-mass-resolution time-of-flight aerosol chemical speciation monitor equipped with a capture vaporizer (CV-UMR-ToF-ACSM)

Nursanto, Farhan R.; Day, Douglas A.; Meinen, Roy; Holzinger, Rupert; Saathoff, Harald; Fu, Jinglan; Mulder, Jan; Dusek, Ulrike; Fry, Juliane L.

doi:10.5194/amt-18-3051-2025

Articles | Volume 18, issue 13

https://doi.org/10.5194/amt-18-3051-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/amt-18-3051-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 18, issue 13

Research article

|

11 Jul 2025

Research article |

| 11 Jul 2025

Development and validation of a NO_x⁺ ratio method for the quantitative separation of inorganic and organic nitrate aerosol using a unit-mass-resolution time-of-flight aerosol chemical speciation monitor equipped with a capture vaporizer (CV-UMR-ToF-ACSM)

Farhan R. Nursanto, Douglas A. Day, Roy Meinen, Rupert Holzinger, Harald Saathoff, Jinglan Fu, Jan Mulder, Ulrike Dusek, and Juliane L. Fry

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Feb 2025	107	16	4	127
Mar 2025	62	6	2	70
Apr 2025	32	10	4	46
May 2025	32	11	2	45
Jun 2025	33	13	5	51
Jul 2025	186	29	16	231
Aug 2025	172	31	4	207
Sep 2025	119	17	3	139
Oct 2025	49	21	3	73
Nov 2025	135	62	6	203
Dec 2025	118	36	8	162
Jan 2026	712	29	14	755
Feb 2026	113	23	5	141
Mar 2026	46	34	10	90
Apr 2026	96	38	15	149
May 2026	65	22	3	90
Jun 2026	14	10	1	25
Jul 2026	125	66	6	197
Aug 2026	20	16	6	42

Cumulative views and downloads (calculated since 09 Jan 2025)

Month	HTML	PDF	XML	Total
Jan 2025	135	21	2	158
Feb 2025	107	16	4	127
Mar 2025	62	6	2	70
Apr 2025	32	10	4	46
May 2025	32	11	2	45
Jun 2025	33	13	5	51
Jul 2025	186	29	16	231
Aug 2025	172	31	4	207
Sep 2025	119	17	3	139
Oct 2025	49	21	3	73
Nov 2025	135	62	6	203
Dec 2025	118	36	8	162
Jan 2026	712	29	14	755
Feb 2026	113	23	5	141
Mar 2026	46	34	10	90
Apr 2026	96	38	15	149
May 2026	65	22	3	90
Jun 2026	14	10	1	25
Jul 2026	125	66	6	197
Aug 2026	20	16	6	42

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Short summary

It is of increasing importance to monitor nitrate pollution that can harm ecosystems. However, commonly used aerosol monitoring equipment cannot distinguish inorganic from organic forms of nitrate, which may have different consequences for the environment. We describe a method to differentiate types of nitrates that can be applied to ambient monitoring to improve understanding of its formation and impact.