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- W2034338519 abstract "Dissolved 15N nitrate and 15N nitrite were determined by derivatization of 15NO2- with 2,4-dinitrophenylhydrazine (2,4-DNPH), followed by FT-IR spectrophotometric analysis of the resulting 15N azide. Samples were derivatized in the aqueous phase and partitioned into CHCl3 with a single extraction with greater than 98% efficiency. The 15N azide displays an asymmetric stretching band at 2089 cm-1 in a region of the infrared spectrum with relatively few interferences. 15N nitrate can be determined after initial reduction to 15N nitrite. The described method is quick and has minimal sample manipulations, undetectable blanks, and a low limit of detection of 0.5 μM, with an average precision in coastal seawater of 6% RSD for 15NO2- and 9% RSD for 15NO3-. Analytical results were verified with a completely independent standard colorimetric technique, in both deionized and natural waters. The two methods produced nitrite concentrations that agreed to within a few percent with no statistical differences observed in the data up to 60 μM. The quantification of 15N was not affected by variable amounts of 14N nitrate typically found in natural waters. Additionally, there was greater than 98% recovery of an added 15N nitrite spike from a coastal seawater sample. Application of the analysis to nitrogen uptake studies is also presented. In one such experiment, the average uptake of 15NO3- in coastal seawater was 13.6 μM day-1 between day 3 and day 7. This 15N uptake corresponded to maximum chlorophyll a increases in the cultured seawater, suggesting the biota were actively assimilating the added nitrate." @default.
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- W2034338519 date "1998-08-19" @default.
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- W2034338519 title "Determination of <sup>15</sup>N Nitrate and Nitrite in Spiked Natural Waters" @default.
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- W2034338519 doi "https://doi.org/10.1021/ac9802731" @default.
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