Dissolved organic nitrogen determination

Dissolved Organic Nitrogen is Commonly Determined in Four Stages ... 

Shepherd and Davies [26] have described a semiautomated version of the alkaline peroxodisulfate procedure for the determination of total dissolved organic nitrogen in seawater. These workers carried out experiments on a range of contaminated and clean seawaters using a version [27] of Koroleff s [24] alkaline peroxodisulfate oxidation technique. 

Table 8.9 Rates of dissolved organic nitrogen (DON) release published and ratios of DON release to gross nitrogen (N) uptake, expressed as a percent, in the field. Rates were determined using N tracer techniques ( N) or changes in concentrations (CC)... 

CoUos, Y., and Momet, F. (1993). Automated procedure for determination of dissolved organic nitrogen and phosphorus in aquatic environments. Mar. Biol. 116, 685—688. 

Miyajima, T., Tanaka, T., and Koike, I. (2005). Determining enrichment of dissolved organic nitrogen in environmental waters by gas chromatography/negative-ion chemical ionization mass spectrometry. Limnol. Oceanogr. Methods 3, 164—173. 

Mitamura O. 1994. Determination of dissolved organic nitrogen in freshwater samples based on Kjeldahl digestion. Jpn.. Limnol. 55 39-45. 

Takeda K. and Fujiwara K. 1996. Characteristics on the determination of dissolved organic nitrogen compounds in natural waters using titanium dioxide and platinized titanium dioxide mediated photocatalytic degradation. Water Res. 30 323-330. 

Fig. 1. Dissolved organic carbon (DOC) (A, A ), nitrogen (DON) (B, B ), and oxygen (O2) (C, C ), in a north—south section off Greenland, as measured for April and September 1958. The watermasses are determined on basis of the temperature—salinity (T—S). Note the formation of Deep Atlantic Water in April and the southwards decrease of O2 and DOC at 1000—2500 m depth. (Reproduced from Duursma, 1961.)...

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