Estrogenic Substances in Wastewater Effluents

Methyl terf-butyl ether (MTBE) was once used as a gasoline octane booster, but was phased out after it appeared as a low-level water pollutant in the United States. Levels of this chemical in recreational lakes and reservoirs were attributed largely to emissions of unburned fuel from recreational motorboats and personal watercraft having two-cycle engines that discharge their exhausts directly to the water. 

Perfluorinated organic compounds constitute a unique class of POP. They occur as completely fluorinated hydrocarbon derivatives, such as CF4, in the atmosphere, where they are regarded as atmospheric pollutants and potential greenhouse gases (see Chapter 7). Other perfluorinated compounds that are organic acids or their salts have been encountered as water pollutants. Most commonly cited are salts of perfluorooctane sulfonic acid others include salts of perfluorinated carboxylic acids, such as perfluorohexanoic acid  

Brominated compounds have been recognized as significant environmental and water pollutants in recent years and have even been found in mothers milk in some conntries. These compounds have been manufactured as flame retardants, largely for use in polymers and textiles. The most common of the brominated compounds Ukely to be encountered as pollutants are polybrominated diphenyl ethers and tetrabromobisphenol  

4 Methyl l Cyclohexane carbox dic acid, a typical loW -molar- inass naphthenic acid 

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