Particulate organic nitrogen

Buesseler et al. (1992b) proposed a method to circumvent these difficulties in comparing residence times. They argued that the deficiency in total " Th with respect to indicates a flux of " Th in association with particles sinking out of the euphotic zone. If the POC (or particulate organic nitrogen, PON)/ Th ratio of these sinking particles is known, a POC (or PON) flux can be calculated as ... 

Removal of particulate organic nitrogen by filtering through a 0.45 xm pore... 

Ehrhardt M (1976) Determination of particulate organic carbon and nitrogen. In Grasshoff K (ed) Methods of seawater analysis. Verlag Chemie, New York, pp 215-220... 

Combustion methods have been used to determine total sulphur and total organic carbon and total halides in soil, total and particulate organic carbon, total halide, phosphorus and nitrogen, total and particulate organic carbon in saline sediments and total nitrogen in sludges. 

Lee, C., and C. Cronin. 1982. The vertical flux of particulate organic nitrogen in the sea decomposition of amino acids in the Peru upweUing area of the equatorial Atlantic. Journal of Marine Research 40 227-251. 

Nutrient regeneration The process whereby particulate organic nitrogen and phosphorous are transformed into dissolved inorganic species, such as nitrate and phosphate. Microorganisms are largely responsible for this process. 

PON, particulate organic nitrogen The fraction of the organic nitrogen pool that is not dissolved in seawater. In practical terms, this includes aU organic nitrogen compormds that do not pass through a filter with a 0.45-micron pore size. 

The extent of gas-to-aerosol conversion of secondary pollutants can be estimated by measuring gas particle distribution factors for carbon, nitrogen, and sulfur species. For example, /c = P/ P + G), where P = particulate organic carbon ng/m as carbon) and G = gas-phase... 

Saino T, Hattori A (1987) Geophysical variation of the water column distribution of suspended particulate organic nitrogen and its N natural abundance in the Pacific and its marginal seas. Deep Sea Res 34 807-827... 

Kendall, C., S. R. Silva, and V. J. Kelly. 2001. Carbon and nitrogen isotopic compositions of particulate organic matter in four large river systems across the United States. Hydro-... 

Figure 9.22. Oceanic cycles of organic carbon, nitrogen, and phosphorus. DOC = dissolved organic carbon POC = particulate organic carbon NPP = net primary production DN = dissolved nitrogen PN = particulate nitrogen DP = dissolved phosphorus, PP = particulate phosphorus. C and N fluxes are in units of 1012 moles C and N y1 P fluxes are in units of 1010 moles P y1.

Figure 10.7 Average composition of nitrogen pools (excluding dissolved N2) in estuarine waters DON = dissolved organic nitrogen PON = particulate organic nitrogen. (Modified from Berman and Bronk, 2003.)...

Sharp, J.H. (1983) The distribution of inorganic nitrogen and dissolved and particulate organic nitrogen in the sea In Nitrogen in the Marine Environment (Carpenter, E.J., and Capone, D.G., eds.), pp. 1-35, Academic Press, New York. 

Verity, P.G. (2002b) A decade of change in the Skidaway River estuary. II. Particulate organic carbon, nitrogen, and chlorophyll a. Estuaries 25, 961-975. 

For phytoplankton particulate organic carbon (POC) and particulate nitrogen (PON) determination, some suspended matter was collected on precombusted (450°C) Whatman GF/F filters, dried at 60°C and stored in polystyrene Petri dishes until analysis. POC and PON were analyzed with a Carlo Erba NA 2000 elemental analyzer. The analytical error of the... 

Table 1 Fe concentrations, Chi a per cell, P. antarctica cell abundance, particulate organic carbon (POC), particulate organic nitrogen (PON) and dissolved organic carbon (DOC) in the P. antarctica cultures under low Fe (<1 nM Fe, LFe) and Fe amended (FIFe) conditions used for bacterial regrowth experiments...

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