Anions in non saline waters - Determination of Anions in Natural and Treated Waters - page 187

In the measurement of chloride, fluoride and nitrate a silver-silver chloride electrode
was applied as reference electrode.
Measuring cells were manufactred from Perspex. Internal diameter of all channels was
2mm.

Reagents
The compositions of solutions used for adjusting appropriate conditions of determination
and of standard solutions are listed in Table 2.18.

Table 2.18 Composition of solutions used in flow measurements for adjusting
appropriate conditions and for standardising

Concentrations mol L −1

Solution Components

CH 3 COOH

Solution 1 0.1

CH 3 COONa

0.1

H 2 O 2

0.03

DCTA 0.01

H 3 PO 4

Solution II 1.0

Solution III NaOH 0.2

EDTA 0.01

Standard NaCI 0.01 ( p Cl 2.00)

5×10 -5 ( p F 4.30)

solution I NaF

NaNO 3

7×10 −4 ( p NO 3 3.15)

(NH 4 ) 2 SO 4

5×10 −4 ( p NH 3 3.00)

Standard solution II As above 10-fold diluted standard solution I

Source: Reproduced with permission from Springer Verlag GmbH [192]

Fig. 2.22 Flow diagram of the four-parameter potentiometric system for the