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Publication Abstract

Quality Assurance Report: NADP/NTN Deposition Monitoring James, Kenni O.W., 1996  Illinois State Water Survey, Champaign, IL,  ISWS MP-177    Full Text Available

The Atmospheric Chemistry Laboratory at the Illinois State Water Survey (ISWS) was selected in the summer of 1978 to be the Central Analytical Laboratory (CAL) for the National Atmospheric Deposition Program (NADP). CAL operations began on October 1, 1978, with 14 NADP sites. In 1982 NADP merged with the National Trends Network (NTN), and the designation changed to NADP/NTN. The number of sites has increased over the years to 200, and the CAL has remained at the ISWS. In 1994 several procedural changes were introduced in order to better quantify the constituents of weekly precipitation samples. With these modifications, the laboratory Quality Control (QC)/Quality Assurance (QA) Program continued to evolve during 1994.

Beginning on January 11, 1994, samples collected at the sites were decanted from the collection bucket into 1-liter wide-mouth high density polyethylene (HDPE) bottles for shipping to the CAL. This altered field procedure requires close observations on the part of the site operators so that the appearance of the sample at the time the bucket is removed from the collector is accurately reported on the Field Form for contamination coding. Since great care is taken to see that a representative sample is sent from sites, the laboratory is charged with observing stringent QC protocols.

The NADP/NTN Quality Assurance Plan (1) summarizes the methods used to analyze and document each sample. This report describes the procedures used at the CAL and presents summaries of these activities to better enable the data user to evaluate the analytical results. Modifications made in 1994 are described in some detail, while ongoing procedures are described in more detail in previous annual reports. All of these reports are available from the Coordinator's Office at Colorado State University (2-12).

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