Stability of nitrate-ion concentrations in simulated deposition samples used for quality-assurance activities by the U.S. Geological Survey
Water-Resources Investigations Report
89-4042
By: T. C. Willoughby, R.B. See, and L.J. Schroder
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Abstract
Three experiments were conducted to determine the stability of nitrate-ion concentrations in simulated deposition samples. In the four experiment-A solutions, nitric acid provided nitrate-ion concentrations ranging from 0.6 to 10.0 mg/L and that had pH values ranging from 3.8 to 5.0. In the five experiment-B solutions, sodium nitrate provided nitrate-ion concentrations ranging from 0.5 to 3.0 mg/L. The pH was adjusted to about 4.5 for each of the solutions by addition of sulfuric acid. In the four experiment-C solutions, nitric acid provided nitrate-ion concentrations ranging from 0.5 to 3.0 mg/L. Major cation and anion concentrations were added to each solution to simulate natural deposition. Aliquots were removed from the 13 original solutions and analyzed by ion chromatography about once a week for 100 days to determine if any changes occurred in nitrate-ion concentrations throughout the study period. No substantial changes were observed in the nitrate-ion concentrations in solutions that had initial concentrations below 4.0 mg/L in experiments A and B, although most of the measured nitrate-ion concentrations for the 100-day study were below the initial concentrations. In experiment C, changes in nitrate-ion concentrations were much more pronounced; the measured nitrate-ion concentrations for the study period were less than the initial concentrations for 62 of the 67 analyses. (USGS)
Suggested Citation
Willoughby, T.C., See, R., Schroder, L., 1989, Stability of nitrate-ion concentrations in simulated deposition samples used for quality-assurance activities by the U.S. Geological Survey: U.S. Geological Survey Water-Resources Investigations Report 89-4042, v, 15 p. :ill. ;28 cm., https://doi.org/10.3133/wri894042.
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Stability of nitrate-ion concentrations in simulated deposition samples used for quality-assurance activities by the U.S. Geological Survey |
| Series title | Water-Resources Investigations Report |
| Series number | 89-4042 |
| DOI | 10.3133/wri894042 |
| Year Published | 1989 |
| Language | ENGLISH |
| Publisher | U.S. Geological Survey ; Copies can be purchased from U.S. Geological Survey Books and Open-File Reports Section, |
| Description | v, 15 p. :ill. ;28 cm. |