Dept. of Environmental Science
Oregon Graduate Center
This paper describes a study designed to develop an analytical protocol for the analysis of contaminants in drinking water believed to have originated in substandard galvanized pipe. These contaminants were both organic and inorganic in nature. The low levels of organic contamination necessitated the evaluation of four methods of preconcentration: 1) inert gas phase stripping onto a precolumn for subsequent direct heat desorption (Purge and Trap); 2) closed loop inert gas phase stripping ("Grob Stripping"); 3) concentration on XAD resins; and 4) liquid-liquid extraction with hexane. Each of these preconcentration techniques was used in conjunction with glass capillary gas chromatography except the Purge and Trap, which utilized packed column chromatography. The "Grob Stripping" method was found most suitable and was used in the analysis of samples from five locations plumbed with suspected galvanized pipe. Two samples were obtained at each site, one at the water meter (i.e., before the galvanized piping) and the other inside the structure. The organic contamination in samples originating after the galvanized pipe consisted of a wide variety of compounds at levels ranging from 20 to 800 parts per trillion. Heavy metal content was examined using X-ray fluorescence and Inductively Coupled Argon Plasma spectroscopies. Elevated levels of zinc and lead were found in samples obtained within the structure.
Joehler, Thomas Hans, "Development of methods for trace analysis of drinking water" (1980). Scholar Archive. 54.