In pollution analysis

The discounting or eliminating from consideration of this apparently abnormal measurement is one of the most dangerous practices exs tent in the general field of trace analysis and particularly in pollution analysis. 

Since aromatic hydrocarbons are one of the chief pollutants in air, the fluoro-meter has been used by the Public Health Service [33] for determining these compounds. Fluorometry is more useful than ultraviolet spectrophotometry in pollution analysis, not only because it is more versatile, but also because it can measure the very low concentrations of hydrocarbons found in samples collected from the air. Such analyses are all the more important because some aromatic hydrocarbons are carcinogenic. One of the best known carcinogenic aromatic hydrocarbons is benzo[a]pyrene, or 3,4-benzpyrene. A very specific method for determining benzo-... 

Concentration of the extracts Common solvent evaporation techniques that are acceptable for use in pollutant analysis include the following ... 

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