Date of sampling
2-Feb 2010
18-Feb 2010
2-Mar 2010
18-Mar 2010
1-Apr 2010
15-Apr 2010
29-Apr 2010
13-May 2010
Arithmetic mean
pH
7.4
7.8
7.7
7.7
7.8
7.8
7.8
7.8
7.7
ECcalc [µS∙cm–1]
at 25˚C
528.2
495.3
465.0
470.1
478.2
498.9
489.3
502.1
490.9
Cations [mg∙l–1]
Ca2+
50.3
46.3
40.2
40.8
41.3
45.7
46.0
46.8
44.7
K+
46.7
42.3
39.7
40
41
40.7
40.5
40.8
41.5
Na+
18.3
20.4
21.4
21.9
22
23.8
22.5
24.6
21.9
Mg2+
6.9
7
6.7
6.72
6.75
6.8
6.7
6.8
6.8
Al3+
0.2
0.1
ND
ND
ND
ND
ND
ND
-
Anions [mg∙l–1]
Cl–
70.3
60.2
58.3
58.7
60.2
62.3
61.5
61.9
61.7
38.7
39.6
37.5
37.9
38
38.4
39.0
38.7
38.5
32.7
33.5
30.8
31.1
32
32.5
31.6
31.8
32.0
1.1
0.7
0.5
0.5
0.6
0.7
0.6
0.7
0.68