Anions in potable waters - Determination of Anions in Natural and Treated Waters - page 475

La Rambla
(urban)

7.96 400.68 393.81 17.333 17.808

La Rambla (well) 7.51 366.79 366.29 13.145 13.340

a See text
Source: Reproduced with permission from the Royal Society of Chemistry [3]

Table 7.4 Determination of pH, alkalinity and total ionic concentration in synthetic
samples

Sample
position, ppm

Alkalinity/ µg mL −1
CaCO 3

Error,
%

Total ionic concentration/
mequiv L −1

Error,
%

pH

Cl − , 5; SO 4 2−, 5;
NO 3 − , 5; HCO 3
− , 10

674 15.84 −3.4 0.666 1.9

Cl − , 25; SO 4 2−, 30;
NO 3 − , 10;
HCO 3 − , 30

7.34 46.59 −5.3 2.519 1.9

Cl − , 60; SO 4 2− , 60;
NO 3 − , 20;
HCO 3 − , 60

7.65 99.95 1.5 5.363 2.6

Cl − , 125; SO 4 2− , 150;
NO 3 − , 40;
HCO 3 − , 150

8.24 252.9 2.7 12.010 −1.5

Cl − , 250; SO 4 2− , 250;
NO 3 , 50; HCO 3
− , 175

8.30 301.4 4.9 18.637 −0.7

Cl − , 350; SO 4 2− , 350;
NO 3 − , 50;
HCO 3 − , 250

8.38 420.3 2.4 26.564 1.63

Source: Reproduced with permission from the Royal Society of Chemistry [3]

measured by measurement of the decrease in absorbance of the indicator solution of
550nm.