AWWA WQTC55050

Many of the current laboratories that analyze for NDMA, use a variety of different analytical approaches and techniques. Sample volume, preservation, extraction method, and instrumentation are all variables within the analysis of this target. While the number of laboratories analyzing for N-Nitrosodimethylamine (NDMA) at the low ppt range continues to increase, the data generated by them cannot be easily referenced against one another, because of the variability in sample preparation and analytical methods employed. The focus of this research was to develop a performance evaluation study to determine the reliability of these techniques and methods for the low level analysis of NDMA, in both reagent water and treated recycled water. The costs associated for the analysis of NDMA, the control conditions, and coordination for developing such a performance study is significant. Thus, the Department of Health Services developed clear objectives while developing this blind performance evaluation (PE) study. The objectives of this study were to: control the generation, storage, and shipment of the PE samples to ensure that all laboratories participating within this study analyzed the same samples, and develop quality controls to monitor this process; spike NDMA concentration levels that cover the monitoring requirements of both the current and proposed action levels, for reagent water and treated recycled water matrices, and confirm both the 2.0 ppt and 20.0 ppt concentration levels; determine the reliability of NDMA data generated by the participating laboratories in both reagent water and treated recycled water matrices; and, determine the extent of influence (if any) that specific techniques, parameters or instrumentation produce within the NDMA data set. The study's efforts were divided between California's Department of Health Services Laboratory - Sanitation and Radiation Laboratories Branch (SRLB-South) in Los Angeles and the Orange County Water District's Laboratory (OCWD) in Fountain Valley, California. OCWD generated the treated recycled water matrix and spiked samples, while SRLB-South generated the reagent water matrix and spiked samples. Includes 7 references, tables.

Product Details

Edition:

Vol. - No.

Published:

01/01/2001

Number of Pages:

13

File Size:

1 file , 290 KB