Table 2 Measurements of air pollutants (https://metnet.imd.gov.in, https://www.env.go.jp)
From: Microbial remediation of polluted environment by using recombinant E. coli: a review
Pollutants | Method | Instrument |
|---|---|---|
SO2 | Ultraviolet fluorescence method (analyzed sample is exposed to UV-lamp irradiation with energetic excitation of SO2 molecule) | Fluorescence analyzer |
NOx (NO, NO2, and NOx) | Chemiluminescence method (nitrogen molecule excitation by ozone) | Chemiluminescence analyzer |
NH3 | Chemiluminescence method (same principles as a NOx analyzer, but with an ammonia converter) | Chemiluminescence analyzer |
CO | Gas-filter correlation (GFC) spectroscopy (absorption of infrared radiation by the CO molecule) | NDIR gas-filter correlation (GFC) spectroscopy or gas chromatography-flame ionization |
Suspended particulates matter (SPM) Mineral dust, organic dust, metallic compounds | Air sampler (SPM is measured by sucking air through a filter and determining the weight of dust collected) Absorption spectrophotometry fluorescence analysis | High-volume air sampler Absorption spectrophotometer High-performance liquid chromatography |
BTEX | Gas chromatograph (detector is specific to volatile organic compounds — benzene, toluene, ethylbenzene, and xylene’s) | BTEX analyzer |
Ozone | Total ozone measurement by Dobson spectrophotometer (measuring the relative intensities of selected pairs of ultraviolet wavelengths) | Dobson spectrophotometer |
Organic gas (vapor) | Vessel method, adsorption method, coolant condensation method | Infrared spectrophotometry, gas chromatography, high-performance liquid chromatography |