2019
DOI: 10.5194/amt-2019-394
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Multifactor colorimetric analysis on pH-indicator papers: an optimized approach for direct determination of ambient aerosol pH

et al.

Abstract: Abstract. Direct measurement of the acidity (pH) of ambient aerosol particles/droplets has long been a challenge for atmospheric scientists. A novel and facile method was introduced recently by Craig et al. (2018), where the pH of size-resolved aerosol droplets was directly measured by two types of pH-indicator papers (pH ranges: 0–2.5 and 2.5–4.5) combined with RGB-based colorimetric analyses using a model of G − B (G minus B) versus pH2. Given the wide pH range of ambient aerosols, we optimize the RGB-based … Show more

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Cited by 2 publications
(2 citation statements)
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“…Surface-enhanced Raman spectroscopy and the introduction of nanometer-sized pH probes into the droplets can be used to enhance sensitivity, but ambient measurements remains an experimental challenge. 39 Recently, methods have been developed to collect aerosol samples on pH indicator papers 40 and to determine their pH over the atmospherically most relevant range 41 of 0–6. This approach is restricted to the collection of particle ensembles, but ongoing developments of microspectroscopic techniques are aimed at pH measurements of ambient airborne aerosols.…”
Section: Current Challengesmentioning
confidence: 99%
“…Surface-enhanced Raman spectroscopy and the introduction of nanometer-sized pH probes into the droplets can be used to enhance sensitivity, but ambient measurements remains an experimental challenge. 39 Recently, methods have been developed to collect aerosol samples on pH indicator papers 40 and to determine their pH over the atmospherically most relevant range 41 of 0–6. This approach is restricted to the collection of particle ensembles, but ongoing developments of microspectroscopic techniques are aimed at pH measurements of ambient airborne aerosols.…”
Section: Current Challengesmentioning
confidence: 99%
“…Lastly, both acid–conjugate base and colorimetric can provide rapid pH data, while polymer degradation is slow. Thus, further method development is needed for atmospheric aerosol pH measurements, though other groups are already using these approaches in the laboratory. Taken together, our knowledge of aerosol acidity from these novel methods is improving, but considerable work remains.…”
Section: Discussionmentioning
confidence: 99%