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- W6010478 abstract "This report is a compilation of analytical results from a study conducted at the U.S. Geological Survey, National Water Quality Laboratory (NWQL) in 1992 to assess the effectiveness of three field treatment protocols to stabilize nutrient concentra- tions in water samples stored for about 1 month at 4C. Field treatments tested were chilling, adjusting sample pH to less than 2 with sulfuric acid and chilling, and adding 52 milligrams of mercury (II) chloride per liter of sample and chilling. Field treatments of samples collected for determination of ammonium, nitrate plus nitrite, nitrite, dissolved Kjeldahl nitrogen, orthophosphate, and dissolved phosphorus included 0.45-micrometer membrane filtration. Only total Kjeldahl nitrogen and total phosphorus were determined in unfiltered samples. Data reported here pertain to water samples collected in April and May 1992 from 15 sites within the continental United States. Also included in this report are analytical results for nutrient concentrations in synthetic reference samples that were analyzed concurrently with real samples." @default.
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- W6010478 date "1995-01-01" @default.
- W6010478 modified "2023-09-27" @default.
- W6010478 title "U.S. Geological Survey nutrient preservation experiment: Nutrient concentration data for surface-, ground-, and municipal-supply water samples and quality-assurance samples" @default.
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- W6010478 doi "https://doi.org/10.3133/ofr95141" @default.
- W6010478 hasPublicationYear "1995" @default.
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