Abstract
The Raman spectra of urban aerosols were obtained for the characterization of aerosols and a qualitative interpretation of the spectra is presented. An experiment was carried out using a double monochromator with a diffraction grating frequency of 1,800 grooves/mm, a diode laser with a 532-nm wavelength, and with a power source of 25 mW for excitation. The spectra exhibited the presence of various inorganic compounds, including carbonates, sulphates, persulphate of ammonium and potassium, nitrates of ammonium (NH4), potassium and strontium, etc. as well as organic species dominated by the carbon group. In the environmental research, this kind of analytical capability is very useful for the chemical identification of atmospheric aerosol.
Highlights
The role of atmospheric aerosols in modifying the regional and global radiative balance and thereby perturbing the climate is widely recognized among researchers internationally
A neon lamp covers the whole electromagnetic spectrum normally used in Raman Spectroscopy (3100 Å to 8900 Å) with an average spacing of about 20 Å
We have shown that Raman Spectroscopic analysis provides a means for obtaining qualitative information on the molecular composition of aerosol particles
Summary
The role of atmospheric aerosols in modifying the regional and global radiative balance and thereby perturbing the climate is widely recognized among researchers internationally. This technique is used for the chemical characterization of aerosols at Pune, India, an agricultural region producing sugarcane as a major crop and dominated by low rainfall and a dry climate with a relative humidity around 40%. We designed the Raman spectrometer so that the spectra of the samples were directly collected from the filters.
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