Total dissolved nitrogen analysis: comparisons between the persulfate, UV and high temperature oxidation methods

Bronk, Deborah A.; Lomas, Michael W.; Glibert, Patricia M.; Schukert, Karyn J; Sanderson, Marta P.

doi:10.1016/s0304-4203(99)00103-6

Cited by 221 publications

(151 citation statements)

References 29 publications

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“…Instead, our data suggest enhanced in situ DON production under nutrient-deplete and elevated light conditions. Several possible mechanisms for this have been suggested in the literature, including active phytoplankton DON release in response to nutrient stress or elevated light conditions (Fogg 1983;Bronk and Ward 1999;Lomas and Glibert 1999) or passive release due to physiological stress, grazing pressure, and viral lysis (Bronk 2002). Overall, the decoupling of DON from both DOC and POM pools, together with robust correlations to nutrient concentrations, suggests that DON production within this HNLC upwelling region may also be attributed to nutrient availability.…”

Section: Resultsmentioning

confidence: 84%

Elemental and isotopic characterization of dissolved and particulate organic matter in a unique California upwelling system: Importance of size and composition in the export of labile material

Walker

McCarthy

2012

Limnology & Oceanography

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We report the interseasonal variation in bulk elemental and stable isotopic (d 13 C, d 15 N) composition of dissolved and particulate organic matter (DOM, POM) during a high-resolution time series (2007)(2008)(2009)) on the Big Sur coast. In addition to interseasonal variations, we explore the relationships between physical size and reactivity (i.e., composition) of exportable organic matter (OM) pools, and characterize the elemental and isotopic composition of size-fractionated POM and DOM pools within this potentially high-nutrient, low-chlorophyll (HNLC) California upwelling region. Average POM concentrations were low (, 5.2 mmol C L 21 and , 0.7 mmol N L 21 ), and all OM pools had low C : N ratios (DOM average 5 15.0 and POM , 7.8)-indicating that this upwelling center may represent an important source of N-rich material to offshore environments. Seasonal ''excess'' dissolved organic carbon (DOC) production was significant (, 30-80 mmol L 21 DOC); however, dissolved organic nitrogen (DON) production and cycling was largely decoupled from both DOC and physical processes. Overall, our results are consistent with this region representing an ''HNLC upwelling system.'' The distinct bulk elemental and isotopic OM composition and seasonality vs. that of high-productivity upwelling regions highlights the need to better understand the biogeochemical diversity of upwelling systems. Finally, we observed a quantifiable size-composition relationship across both POM and DOM size classes, perhaps representing a powerful new tool for modeling N vs. C fluxes in ocean biogeochemical cycles.

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Section: Resultsmentioning

confidence: 84%

Elemental and isotopic characterization of dissolved and particulate organic matter in a unique California upwelling system: Importance of size and composition in the export of labile material

Walker

McCarthy

2012

Limnology & Oceanography

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“…The precision of the dissolved organic nitrogen (DON) measurement also depends on the inorganic nitrogen concentrations being lower when samples with high inorganic nitrogen concentrations are processed (Hansell 1993). The tendency for organic nitrogen is to be underestimated because the methods used for total dissolved nitrogen determination: UV photolysis, wet chemical persulphate oxidation, high-temperature catalytic combustion (to name the three most common techniques used for the conversion of organic nitrogen compounds into quantifiable N forms) are not able to transform all nitrogen in the sample to the analyte measured (Bronk et al 2000). As a re- Data on ICP Forests plots were retrieved from the Czech Hydrometeorological Institute web site (www.chmi.cz) or taken from Boháčová et al (2010) sult we can find papers reporting negative organic nitrogen concentrations (physically impossible) in up to 15% of the measurements Siemens, Kaupenjohann 2002).…”

Section: Institute Of Forest Ecology Faculty Of Forestry and Wood Tementioning

confidence: 99%

Organic and inorganic nitrogen in precipitation and in forest throughfall at Bílý Kříž site (Beskydy Mts., Czech Republic)

Drápelová¹

2012

J. For. Sci.

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Organic nitrogen is an important but yet not very well explored component of nitrogen deposition. In this study concentrations and fluxes of organic and inorganic nitrogen in bulk precipitation in an open field (BOF) and in throughfall (THR) were evaluated at the Bílý Kříž experimental site (Moravian-Silesian Beskydy Mts., Czech Republic, 908 m a.s.l.) with a young Norway spruce stand. The results of a two-year study (2008 and 2009) were compared with the results obtained during the same time period on forest plots included in ICP Forests Programme in the Czech Republic. Total nitrogen deposition in BOF at the Bílý Kříž site amounted to about 918 mg·m–2·a–1, the contribution of organic nitrogen was about 8%. Total nitrogen flux with THR at Bílý Kříž was about 1,305 mg·m–2·a–1 during the studied years and organic N accounted for 12% of this amount. The ranges of the two-year average values found for total nitrogen flux on ICP Forests plots throughout the Czech Republic were as follows: 759–1,857 mg N·m–2·a–1 with 7–38% contribution of organic N in BOF and 928–3,816 mg N·m–2·a–1 with 7–20% contribution of organic N in THR. The share of organic nitrogen in THR nitrogen fluxes at Bílý Kříž proved clear seasonality with maxima in July. A highly significant correlation between N-NH4+   and N-NO3–   concentrations in BOF suggested the common anthropogenic source of these substances at the Bílý Kříž site. No significant correlation was found either between organic N and N-NH4+ or between organic N and N-NO3– concentrations in BOF. Cumulative deposition charts showed different behaviour of particular nitrogen deposition components while passing through the canopy.

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“…Chloroform (1 ml L -1 ) was added to inhibit the growth of Bran-Luebbe Inc., Germany). TDN in rainwater was analyzed using the alkaline persulfate-oxidation (to nitrate) method (Bronk et al, 2000) followed by ultraviolet spectrophotometry (Shimadzu UV-2201, Shimadzu Inc., Japan). Organic N was then calculated by difference (TDN minus DIN).…”

Section: Collection Storage and Measurement Of Rainwatermentioning

confidence: 99%

Evidence for organic N deposition and its anthropogenic sources in China

Zhang¹,

Zheng²,

Liu³

et al. 2008

Atmospheric Environment

163

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Total dissolved nitrogen analysis: comparisons between the persulfate, UV and high temperature oxidation methods

Cited by 221 publications

References 29 publications

Elemental and isotopic characterization of dissolved and particulate organic matter in a unique California upwelling system: Importance of size and composition in the export of labile material

Elemental and isotopic characterization of dissolved and particulate organic matter in a unique California upwelling system: Importance of size and composition in the export of labile material

Organic and inorganic nitrogen in precipitation and in forest throughfall at Bílý Kříž site (Beskydy Mts., Czech Republic)

Evidence for organic N deposition and its anthropogenic sources in China

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