The “atmosphere” of the human body

Schoemaecker, Coralie; Carslaw, Nicola

doi:10.1126/science.add8461

Cited by 1 publication

(1 citation statement)

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“…Further, the increased • OH concentrations during 14:00–17:00 were likely caused by intensified works conducted in the laboratory with an increased use of instruments (e.g., UV and xenon lamps, sonicators, etc. ). − …”

Section: Resultsmentioning

confidence: 99%

Field Quantification of Hydroxyl Radicals by Flow-Injection Chemiluminescence Analysis with a Portable Device

Yu,

Zheng,

Tan

et al. 2024

Environ. Sci. Technol.

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Hydroxyl radical ( • OH) is a powerful oxidant abundantly found in nature and plays a central role in numerous environmental processes. On-site detection of • OH is highly desirable for real-time assessments of • OH-centered processes and yet is restrained by a lack of an analysis system suitable for field applications. Here, we report the development of a flow-injection chemiluminescence analysis (FIA-CL) system for the continuous field detection of • OH. The system is based on the reaction of • OH with phthalhydrazide to generate 5-hydroxy-2,3-dihydro-1,4phthalazinedione, which emits chemiluminescence (CL) when oxidatively activated by H 2 O 2 and Cu 3+ . The FIA-CL system was successfully validated using the Fenton reaction as a standard • OH source. Unlike traditional absorbance-or fluorescence-based methods, CL detection could minimize interference from an environmental medium (e.g., organic matter), therefore attaining highly sensitive • OH detection (limits of detection and quantification = 0.035 and 0.12 nM, respectively). The broad applications of FIA-CL were illustrated for on-site 24 h detection of • OH produced from photochemical processes in lake water and air, where the temporal variations on • OH productions (1.0−12.2 nM in water and 1.5−37.1 × 10 7 cm −3 in air) agreed well with sunlight photon flux. Further, the FIA-CL system enabled field 24 h field analysis of • OH productions from the oxidation of reduced substances triggered by tidal fluctuations in coastal soils. The superior analytical capability of the FIA-CL system opens new opportunities for monitoring • OH dynamics under field conditions.

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Section: Resultsmentioning

confidence: 99%