Anions in potable waters - Determination of Anions in Natural and Treated Waters - page 469

Fig. 7.2 Calibration peaks obtained with 10cm 2 buffer solution diluted to
100cm 3 with distilled water. The values on top of the peaks represent
mg L −1 bicarbonate ions, (b) Corresponding calibration graph
Source: Reproduced with permission from United Trades Press [1]

7.1.2 Spectrophotometric method
Van Staden and Van Vleit [2] have described a dimple, automated procedure for
determining total alkalinity in potable water. Up to 120 samples per h can be analysed
with a coefficient of variation of better than 1.4%.

Table 7.1 Comparison of results obtained by the FIA method, the electrometric method
and the automated segmented bromocresol green methoda

Sample Automated Electrometric method FIA method Coefficient of