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Some forms of mercury are more insidious than others, and these forms are also among the more difficult to analyze. The method described by the authors is said to overcome many obstacles inherent in other methods. The authors provide some background with regard to mercury testing and then detail the procedure that evolved at their lab.

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This article begins by describing the U.S. Public Health Service Water Pollution Surveillance System that was established in 1957 for the collection and dissemination of basic data on water quality. The article lists the materials that fall into the trace metal category that may be measured spectrographically, along with the significance of each metal. This article discusses the sample preparation and the spectrographic method used in the analyses and summarizes the results of analyses of samples from six major water systems of the U.S. since the beginning of the program. The six major water systems include the Ohio River, Colorado River, Missouri River, Columbia River, Mississippi River, and the Great Lakes.