Precipitation Chemistry Quality Assurance Project (PCQA)

National Atmospheric Deposition Program
Field Audit Program

The field-audit program was designed to measure the effects of field exposure, handling and processing on the chemistry of National Atmospheric Deposition Program /National Trends Network (NADP/NTN) precipitation samples. Field-audit data are used to estimate contamination levels in NADP/NTN samples and to evaluate the stability (preservation) of solutes in the samples.


  National Atmospheric Deposition Program National Trends Network National Water Quality Laboratory Office of Water Quality

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