AWWA WQTC69296

Research is now complete on the U.S. Environmental Protection Agency's (USEPA's) effort to revise USEPAMethod 524.2 for volatile organic contaminants in drinking water. The new method, DraftMethod 524.3, achieves several significant goals. It has a revised list of analytes that nowincludes the iodinated trihalomethanes (I-THMs), fuel oxygenates, and volatile organiccompounds (VOCs) amenable to purge-and-trap from the preliminary Contaminant CandidateList 3 (CCL3). It employs maleic acid, a common food preservative, to preserve samples,eliminating the requirement to ship a hazardous reagent (hydrochloric acid) to the field. The newmethod also allows selected ion monitoring (SIM) for the detection of analytes with very lowregulatory limits. Three purge-and-trap concentrators and several traps were evaluated under alarge range of purge volumes, purge rates, and dry purge times to determine acceptable limits forthese parameters in order to allow method flexibility without jeopardizing performance.Validation studies in a single laboratory have been completed to validate the revised method forprecision, accuracy, detection limit, and storage stability using the new preservation agents. Includes 2 references, tables.

Product Details

Edition:

Vol. - No.

Published:

11/01/2008

Number of Pages:

12

File Size:

1 file , 740 KB