Anions in non saline waters - Determination of Anions in Natural and Treated Waters - page 246

generator and the emission signals are measured at 391.4nm.
The N 2+ 'main' system bandhead at 391.4nm provided the lowest detection limit, while
the N 2 'second positive' system bandhead at 337.1nm and the nitrogen atomic line at
746.8nm were observed to have wide dynamic ranges (more than three orders of
magnitude). The emission signal of the NH band maximum ('A' system) at 336.0nm was
the largest of the four analytical wavelengths investigated but the detection limits of this
band, especially for ammonium nitrogen, were not so good because of the significantly
large blank signals at 336.0nm. The relative standard deviation of eight replicate
measurements was about 7% at the 10-fold concentration of the detection limit and was
about 4% at the 100-fold concentration for all the analytical wavelengths.
Fig. 2.35 (a) Extract from 100ml of water spiked with 1µg of nitrate in 0.5ml of
eluent, aliquot volume 20µL (b) standard, 200ng of ol-nitrophenol
(2). (1) is an oxygen peak
Source: Reproduced with permission from Springer Verlag [578]
2.64.14 Ion chromatography
The application of this technique is discussed under multianion analysis in sections
12.2.1, 12.2.4 and 12.2.5.
2.64.15 High performance liquid chromatography
Alawi [578] has described a simple and specific high performance liquid