US EPA

1485836 

Technical Report 

Detection of chlorinated aromatic compounds 

Ekechukwu, AA 

NTIS/03005981_a 

GRA and I 

GRA and I 

Disclosed is a method for making a composition for measuring the concentration of chlorinated aromatic compounds in aqueous fluids and an optical probe for use with said method. The composition comprises a hydrophobic polymer matrix, preferably polyamide, with a fluorescent indicator uniformly dispersed therein. The indicator fluoresces in the presence of the chlorinated aromatic compounds with an intensity dependent on the concentration of these compounds in the fluid of interest, such as 8-amino-2-naphthalene. The probe includes a hollow cylindrical housing that contains the composition in its distal end. The probe admits an aqueous fluid to the probe interior for exposure to the composition. An optical fiber transmits excitation light from a remote source to the composition while the indicator reacts with chlorinated aromatic compounds present in the fluid. The resulting fluorescence light signal is reflected to a second optical fiber that transmits the light to a spectrophotometer for analysis. 

Chlorinated Aromatic Hydrocarbons; Aqueous Solutions; Detection; Fluorescence; Optical Fibers; Spectrophotometry; Patent applications; EDB/400102; EDB/540320