Related Experiment Video
Updated: Jun 11, 2026

Production and Measurement of Organic Particulate Matter in the Harvard Environmental Chamber
Published on: November 18, 2018
Contribution from the primary and secondary sources to the atmospheric formaldehyde in Kolkata, India
C Dutta1, A Chatterjee, T K Jana
1Department of Chemistry, Calcutta University, 92, A.P.C. Road, Kolkata-700 009, India.
Abstract:
A novel and straight forward method is adopted to segregate the contribution of primary and secondary sources of formaldehyde based on the rates of its formation and removal at different times in the urban atmosphere of Kolkata. To achieve the above objective, the diurnal and seasonal mixing ratios of formaldehyde were measured during dry season at two busy roadside locations. The maximal secondary formation fluxes of formaldehyde during summer and winter were found to be 6.63 x 10(7) and 1.23 x 10(7) molecules cm(-3) s(-1), respectively. Apart from formaldehyde (C(1)), several other carbonyls were quantified in this study. An overall good correlation between acetaldehyde (C(2)) and propanal (C(3)) indicates the contribution of vehicular emission to the carbonyl budget. The secondary formaldehyde contributions in summer and winter were about 71% and 32%, respectively. The relative mean contributions of C(1), C(2) and ozone towards generation of OH fluxes in summer were found to be 1.56 x 10(7), 6.96 x 10(5), and 1.29 x 10(7)molecules cm(-3) s(-1), respectively, which were 3.2, 3.4 and 1.6 times higher than those in winter.
More Related Videos
07:12Façade-Level Monitoring of CO2 Variability under Urban Heat Island Conditions using Low-Cost Sensor Data Loggers
Published on: December 12, 2025
09:33Visualizing Field Data Collection Procedures of Exposure and Biomarker Assessments for the Household Air Pollution Intervention Network Trial in India
Published on: December 23, 2022
Related Concept Videos
NMR Spectroscopy and Mass Spectrometry of Aldehydes and Ketones
IR and UV–Vis Spectroscopy of Aldehydes and Ketones
Structures of Aldehydes and Ketones
In aldehydes (Figures 1a and 1b), the carbonyl...
Preparation of Aldehydes and Ketones from Alcohols, Alkenes, and Alkynes
Reactions of Aldehydes and Ketones: Baeyer–Villiger Oxidation
The carbonyl center is activated by...
Aldol Condensation with β-Diesters: Knoevenagel Condensation