English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

A proton transfer reaction ion-drift chemical ionization mass spectrometer(PTR-ID-CIMS) equipped with a hydronium (H3+O) ion source was developed and deployed near an industrial zone in the Yangtze River Delta(YRD) region of China in spring 2015 to investigate industry-relatedemissions of volatile organic compounds (VOCs). Air pollutants includingformaldehyde (HCHO), aromatics, and other trace gases (O3 and CO) were simultaneously measured. Humidity effects on the sensitivity of thePTR-ID-CIMS for HCHO detection were investigated and quantified. Theperformances of the PTR-ID-CIMS were also validated by intercomparing withoffline HCHO measurement technique using 2,4-dinitrophenylhydrazone (DNPH)cartridges and the results showed fairly good agreement (slope  =  0.81,R2  =  0.80). The PTR-ID-CIMS detection limit of HCHO (10 s,three-duty-cycle averages) was determined to be 0.9–2.4(RH  =  1–81.5 %) parts per billion by volume (ppbv) based on 3 timesthe standard deviations of the background signals. During the field study,observed HCHO concentrations ranged between 1.8 and 12.8 ppbv with acampaign average of 4.1 ± 1.6 ppbv, which was comparable with previousHCHO observations in other similar locations of China. However, HCHO diurnalprofiles showed few features of secondary formation. In addition, time seriesof both HCHO and aromatic VOCs indicated strong influence from localemissions. Using a multiple linear regression fit model, on average theobserved HCHO can be attributed to secondary formation (13.8 %), background level (27.0 %), and industry-related emissions, i.e., combustion sources(43.2 %) and chemical productions (16.0 %). Moreover, within theplumes the industry-related emissions can account for up to 69.2 % of theobserved HCHO. This work has provided direct evidence of strong primaryemissions of HCHO from industry-related activities. These primary HCHOsources can potentially have a strong impact on local and regional airpollution formation in this area of China. Given the fact that the YRD is thelargest economic zone in China and is dense with petrochemical industries,primary industrial HCHO emissions should be strictly monitored and regulated

atmospheric measurement techniques

Detection of formaldehyde emissions from an industrial zone in the Yangtze River Delta region of China using a proton transfer reaction ion-drift chemical ionization mass spectrometer