Research Needs and Gaps
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A wide array of research needs, gaps, and activities need to be addressed to delineate the scope of environmental and human health issues that might derive from the occurrence of PPCPs in the environment. Some of these research needs, gaps and activities are discussed in the 2004 Christian Daughton's book chapter.
Daughton CG. "PPCPs in the Environment: Future Research — Beginning with the End Always in Mind (PDF)," (28pp, 128KB) In Pharmaceuticals in the Environment, Kümmerer K (Ed.), 2nd edition, Springer, 2004, Chapter 33, pp. 463-495.