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Laboratory for aerosol filters treatment

The laboratory is used for treating and weighting the filters for aerosol sampling. Filters are weighted after a temperature and humidity conditioning following the requirements of the EN-14907 standards. This filter weighing procedure is used for determining the concentrations of TSP, PM10, PM2.5 and PM1 by means of standardized methods.

Filters are conditioned to 20ºC and a fixed relative humidity (50% RH for air quality studies and 30% RH for research studies) into a methacrylate box which also contains a balance used for filters weighing.

See in the following picture how the samples of particles collected on filters at Izaña in summer are usually red due to the predominant presence of Saharan dust reddish particles. This reddish color is due to the presence of iron oxides particles that absorb ultraviolet and blue light.

Left: blank filter (before sampling). Right: filter with a sample of PM10 particles collected at Izaña during a Saharan dust event.

See in the following picture how the samples of particles collected on filter in Santa Cruz are usually black (due to soot particles), except during Saharan dust events (when they are red). This black color evidence the presence of soot particles emitted in the exhaust of diesel automobiles, by ships and by industrial facilities.

Left: blank filter (before sampling). Right: filter with a sample of PM10 particles collected at Santa Cruz de Tenerife.