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USE OF ULTRASOUND IN MONITORING CHEMICAL CONTAMINATION IN WATER
Citation:
Poziomek, E., G. Orzechowska, AND W. Engelmann. USE OF ULTRASOUND IN MONITORING CHEMICAL CONTAMINATION IN WATER. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-95/059.
Description:
The U.S. Environmental Protection Agency (EPA) has been examining the potential for combining sonication with other technologies for monitoring specific classes of organic pollutants in water. ollutants are decomposed into ions which can be detected using known electrochemical techniques. n increase in concentration of the target ion after sonication indicates the presence of the pollutant. his paper presents additional results on the use of sonochemistry in monitoring carbon tetrachloride, chloroform, and trichlorethylene in water. elationships were examined for changes in chloride ion and pH upon sonication versus concentration of the individual organochlorine pollutants. nother issue deals with the effect of various humic acids (at different concentrations) on changes in Cl-pH, and conductivity, as a result of sonicating solutions of the pollutants. inear relationships with excellent correlation coefficients were found between increases of Cl- (after sonications) and 3-80 ppm concentrations of CCl4, CHCl3 and TCE in water. he pH was found to decrease in all cases, and the relationships were nonlinear. hree different humic acids were examined in concentrations up to 400 ppm for effects on Cl- yield, pH changes, and conductivity changes. here were no differences in Cl- yield relative to control solutions of chlorinated hydrocarbons in deionized water. owever, conductivity and pH changes were smaller.