Anions in seawater - Determination of Anions in Natural and Treated Waters - page 388

standard deviation of a determination of 4nM nitrite was 2%. The limit of detection was
0.3nM for an adsorption time of 60s. The sensitivity of the method in seawater was the
same as in fresh water.
Fig. 3.10 Nitrate, temperature and chlorophyll measured at 15m in the Santa
Barbara Channel (34°01'56”N, 119° 19'30”W). Temperature and
chlorophyll were determined with a thermistor and a Turner Designs
fluorometer at the effluent of the debubbler
Source: Reproduced with permission from Springer Verlag [133]
3.20.7 Ion chromatography
Tyree and Bynum [136] describe an ion-chromatographic method for the determination
of nitrate and phosphate in seawater. The pretreatment comprised vigorous mixing of the
sample with a silver-based cation-exchange resin, followed by filtration to remove the
precipitated silver salt.
The application of electrostatic ion chromatography is discussed under multianion
analysis in section 3.32.2.
3.21 Nitrite
3.21.1 Spectrophotometric methods
Spencer and Brewer [115] have reviewed methods for the determination of nitrite in
seawater. Workers at the Water Research Centre, UK [137] have described an automated
procedure for the determination of oxidised nitrogen and nitrite in estuarine waters. The
procedure determines nitrite by reaction with N-1 naphthyl-ethylene diamine