Quantitative Determination of Airborne Redox-Active Compounds Based on Heating-Induced Reduction of Gold Nanoparticles.
Ranxue YuFei PanClaudia SchreineXinhou WangDavid M BellGuangyu QiuJing WangPublished in: Analytical chemistry (2021)
Airborne redox-active compounds (ARC) account for a substantial fraction of atmospheric aerosols and play a vital role in chemical processes that influence global climate and human and ecological health. With the exception of the determination of total organic carbon by the expensive total organic carbon (TOC) analyzer, there is currently no easy-to-use method to quantify ARC. Here, we designed a method to detect the concentration of ARC by using the thermal-induced reduction and colorimetric behaviors of gold nanoparticles (AuNPs), in which the humic substances (HS) was used as a standard model of ARC to calculate the HS-equivalent concentration of ARC. Distinguished from the conventional complex methods, e.g., TOC analysis, the proposed approach measured localized surface plasmon resonance absorption of AuNPs and the target ARC concentration can be either directly quantified by the absorption spectrometer or qualitatively evaluated by the naked eyes. By using the absorption spectrometer, a limit of detection of 0.005 ppm by our AuNP sensor was achieved. To validate this sensing technique, aerosol samples collected from Basel (suburban), Bern (urban), and Rigi mountain (rural and high-altitude) sites in Switzerland were further investigated through the TOC combustion method. The results thereby substantiated that our plasmonic absorption-based AuNP sensor upholds a great promise for fast, cost-efficient total ARC detection and air quality assessment.
Keyphrases
- gold nanoparticles
- particulate matter
- high resolution
- high glucose
- endothelial cells
- public health
- healthcare
- reduced graphene oxide
- climate change
- label free
- diabetic rats
- mental health
- solid phase extraction
- optical coherence tomography
- nitric oxide
- machine learning
- real time pcr
- hydrogen peroxide
- health information
- social media
- big data
- induced pluripotent stem cells
- electron transfer