Principle of the Measurement
The BrC-PILS instrument measures the absorption and concentration of water-soluble organic carbon concentration. A particle-into-liquid sampler collects particles into a solution of pure water. The liquid is pumped through a liquid waveguide capillary cell to measure absorption at 300-700 nm using a deuterium/halogen lamp and a grating spectrometer. The total dissolved carbon is then measured by conversion to CO2. Together, these measurements provide the absorption spectrum, concentration of dissolved carbon, and the the mass absorption coefficient (absorption per unit carbon).
Absorption, concentration, and mass absorption coefficient of water-soluble organic aerosol
Time Response / Detection Limit
Absorption: 0.2 Mm-1 in 4 seconds
Organic aerosol mass: 0.06 μg m-3 in 4 seconds