10.2190/CD7R-PKW1-8VM8-LAVF CD7RPKW18VM8LAVF 6 Nonionic Surfactants in Perspective 87 96 20020509 20020509 20020509 20020509 CD7RPKW18VM8LAVF.pdf http://baywood.metapress.com/link.asp?target=contribution&id=CD7RPKW18VM8LAVF 1 M. M. Varma Dakshesh Patel School of Engineering, Howard University, Washington, D.C. Roy F. Weston, Inc., West Chester, Pennsylvania The emergence of hard synthetic organic compounds in water has added a new dimension to public health-related problems. During the last thirty years, the chemical industry has demonstrated a gradual and steady growth. Industrial growth has generated nondegradable and slowly degradable chemicals. Tracing the fate of hard chemicals in a stream of water is sometimes difficult because of their identification and quantification, because the techniques for their identification are not fully developed, and/or their concentration may be extremely low, making it rather difficult to measure. 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