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This paper describes the Purge and Trap-Gas Chromatography/Ion Trap Mass Spectrometry method which analyzes approximately 100 samples per month for the disinfection byproduct cyanogen chloride. This method has a detection limit of 2.20 ug/L and a linear dynamic range of 0.1-20 ug/L, has demonstrated excellent accuracy and precision as judged from fortified spike recoveries and duplicate sample results. Method ruggedness has also been excellent. Quality control splits analyzed at a second independent laboratory were also in good agreement. Data associated with a very high percentage of the sample analyzed during the first year of the study have met all EPA quality control performance criteria specified in the DBP/ICR Analytical Methods Manual. Finally, data from a time storage study, where 151 of the remaining first quarter ICR samples were stored an additional 7 days and then analyzed, are reported. These samples, which spanned a pH range of 4.2 to 8.4, displayed an average loss (relative to the day one measurement) of 12 percent and pH exhibited a marginally significant effect on recovery. Average recoveries for duplicate samples held an additional seven days at the laboratory prior to analysis (eight from time of collection) somewhat offsets the concern about the effect that compound degradation has on the accuracy of the second day results.

Product Details

Published: 01/01/1998 ISBN(s): 0898679796 Number of Pages: 13File Size: 1 file , 110 KB