ISSN:
1573-2932
Source:
Springer Online Journal Archives 1860-2000
Topics:
Energy, Environment Protection, Nuclear Power Engineering
Notes:
Abstract The variability in performance of 4 wet/dry atmospheric deposition samplers were compared for 1 yr. Samples were collected weekly and analyzed for pH, specific conductance, common ionic chemical constituents, and sample mass. Differences in the results between collectors were interpreted in terms of violations of siting criteria. Several of the criteria used in siting collectors for the National Atmospheric Deposition Program/National Trends networks were purposely compromised to determine the effect of such criteria on the validity of samples collected at sites where the location of samplers violates accepted siting criteria. This study showed that items should be excluded within a 45° cone of the sampler and also items of sufficient bulk to disturb wind patterns should be excluded within 5 m of the sampler. The nonnormal distribution of residuals from a parametric analysis of variance of the data set necessitated the application of the nonparametric Friedman test to assess comparability of chemical deposition and volume between and within samplers. Statistically significant differences existed for most comparisons, however, the test does not permit quantification of their magnitudes, although general trends may be determined. Two methods to try to estimate the magnitude of differences are presented. Differences in analyte concentrations between samplers were small.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00283117
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