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Recently, as part of an on-going American Water Works Association ResearchFoundation project, a two-page survey (i.e., SUVA survey) was conducted among drinking waterpractitioners and researchers (Karanfil et al., 2002). The survey objectives were to determinecurrent practices for measuring dissolved organic carbon (DOC) and ultraviolet (UV)absorbance, thus their implications on specific ultraviolet absorbance (SUVA) determination,and to compare them with the procedures specified in Standard Methods and the US Environmental Protection Agency'sEnhanced Coagulation Guidance Manual. One hundred thirty-eight (138) responses, including12 commercial and government laboratories, 21 university researchers and 105 water utilities,were received from 34 states in the U.S. and three other countries. Survey results indicated thatfilter selection (pore size and type), filter cleaning, and sample filtration are particular areaswhere notable differences existed among respondents. Therefore, the present study wasundertaken to examine the impacts of filter selection, cleaning and sample filtration on DOC andUV254 measurements.Three factors can significantly impact DOC and UV254 measurement results, and thusSUVA254 determinations: leaching of organic and UV254 absorbing components from filters;adsorption of dissolved and colloidal organic matter by filters; and, fouling of filtermembrane surfaces by the buildup of particulate matter present in raw waters. This papersummarizes the major findings from a systematic investigation of the first two factors. Adetailed summary of the findings from this work has recently been published in an article in theJournal of American Water Works Association (Karanfil et al., 2003) and can also be found inother documents currently being prepared (Karanfil et al., 2003; Erdogan, 2003). Includes 8 references, tables, figures.

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Edition: Vol. - No. Published: 06/15/2003 Number of Pages: 8File Size: 1 file , 340 KB