A novel technique for the humidity dependent calibration of hypoiodous acid (HOI) and iodine (I<sub>2</sub>)

Marden, Lewis; Shaw, Marvin D.; Andrews, Stephen J.; Zmajkovic, Maya; Rund, Phil; Alexander, Becky; Thornton, Joel; Peters, Andrew; Karadakov, Peter; Carpenter, Lucy J.

doi:10.5194/amt-19-2715-2026

Articles | Volume 19, issue 8

https://doi.org/10.5194/amt-19-2715-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/amt-19-2715-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 19, issue 8

Research article

|

22 Apr 2026

Research article |

| 22 Apr 2026

A novel technique for the humidity dependent calibration of hypoiodous acid (HOI) and iodine (I₂)

Lewis Marden, Marvin D. Shaw, Stephen J. Andrews, Maya Zmajkovic, Phil Rund, Becky Alexander, Joel Thornton, Andrew Peters, Peter Karadakov, and Lucy J. Carpenter

Data sets

A novel technique for the humidity dependent calibration of hypoiodous acid (HOI) and iodine (I2): Data resources Lewis Marden https://doi.org/10.15124/48ade8f3-d750-4fe6-a2d9-b8f69bf86262

Short summary

Hypoiodous acid (HOI) and molecular iodine (I₂) are the dominant precursors of reactive gaseous iodine, which plays an important role in the atmospheric oxidative capacity and in aerosol formation. However, difficulties in the quantification of HOI and I₂ mean that very few measurements are available. This work describes a novel calibration method for HOI and reports the detection of HOI and I₂ in the marine boundary layer using Br^- chemical ionisation mass spectrometry.