Multianion analysis, applications of ion chromatography - Determination of Anions in Natural and Treated Waters - page 662

for nitrate, 0.5mg L −1 for sulphite and 0.1mg L −1 for sulphate.
Little change was found in the concentration of anions during 3d storage when the
sample was kept at 25°C in a refrigerator.
Fig. 12.28 shows an example of an ion chromatogram of rainwater. Using the
following conditions, Schwabe et al. [60] determined chloride, fluoride, nitrate,
phosphate and sulphate in 20min in rainwater and potable water in amounts down to
0.5mg L −1 .

Type Dionex D12

Sensitivity 1ks

Analytical column Fast run anion separator

Suppressor column Anion suppressor

Sample loop 100µL

115ml h −1

Pump flow

Pressure 22 bar

Run time 11min per sample

0.0048mol L −1 Na HCO 3
0.0023mol L −1 Na 2 CO 3

Eluent

Fig. 12.29 shows the results for chloride, fluoride, nitrate and sulphate in Berlin
rainwater. The month of March shows significantly higher loads than the other months,
caused by high rainfall. There is also a high load of sulphate and nitrate for October and
November.

Fig. 12.28 Example of ion-chromatogram of rainwater
Source: Reproduced with permission from Elsevier Science [60]