Anions in surface, ground, mineral, borehole and pure waters - Determination of Anions in Natural and Treated Waters - page 461

Fig. 6.1 Ultraviolet absorption spectre of nitrate and nitrite standard solutions
containing 1 mg L −1 of nitrogen
Source: Reproduced with permission from the Royal Society of
Chemistry [28]

Table 6.4 Nitrate concentrations determined by ultraviolet and 2,4-xylenol methods
(absorbance measurement measured in ion cells)

Nitrate nitrogen mg L −1

Type of water Ultraviolet method 2, 4-xylenol method

Butler Sandstone 0.04 0.04 (4 in all)

Butler Sandstone 8.3 8.2 (4 in all)

Butler Sandstone 0.005 (4 in all) 0.04 (4 in all)

Butler Sandstone 0.54 0.55