Table 1 Composition of water samples from the outflow of the Basel-1 borehole and from the river Rhine

Date /time

11.12.06 (16:00)

14.12.06 (17:25)

14.12.06

16.01.07

05.02.07

23.02.07

29.03.07

20.04.07

15.06.07

27.09.07

06.02.08

05.03.08

28.05.15

Laboratory

LV

IMPG

IMPG

IMPG

IWB

IWB

IWB

IMPG

IWB

IWB

L8

IMPG

IMPG

pH

–

6.13

7.12

7.9

7.56

7.90

–

7.12

7.50

–

–

6.59

8.07

EC mS/cm

–

11.3

11.3

14.9

16.9

15.0

–

18.0

20.0

22.0

–

23.7

0.27

Ca

302

300

301

283.1

301

297

334

538

372

450

465

480

51.30

Mg

1.5

1.48

1.46

0.70

0.57

0.50

0.70

0.18

0.70

0.90

0.60

0.96

6.46

Na

1405

1981

1975

2830

2998

2940

3170

3787

4230

5360

5110

5414

6.57

K

175

207

207

294.4

306

322

350

326

391

485

439

606

2.40

Sr

4

4.9

4.8

–

6.8

5.9

7.1

7.6

9.8

11.7

11.6

14.1

–

Rb

–

 < 0.03

 < 0.03

–

 < 0.03

–

–

3.18

–

–

–

 < 0.03

–

Li

–

11

11

16.6

16

19.2

19.8

19.9

25.1

31.9

31.6

28.3

–

Fe

–

0.49

0.22

2.72

2.61

4.29

1.32

0.16

0.42

0.20

–

0.64

–

Al

–

 < 0.02

 < 0.02

0.14

 < 0.02

 < 0.01

 < 0.01

 < 0.02

 < 0.01

 < 0.01

–

0.04

 < 0.02

As

0.15

0.18

0.46

0.14

0.05

0.04

0.03

0.03

0.02

0.09

–

0.18

–

HCO₃

–

103

99.5

141

140

133

138

125

45.1

–

117.1

131.2

145.00

SO₄

782

605

598

311.3

284

313

295

295

260

245

235

237

20.50

Cl

2520

3598

3521

5039

5382

5410

5890

6664

7680

7980

8990

9541

9.44

F

–

6.0

5.84

–

5.65

6.00

5.80

7.89

5.80

6.20

6.00

4.97

0.0

Br

–

16.8

16.6

–

25.4

27.4

27.8

37.4

38.2

41.4

45.5

52.7

 < 0.05

SiO₂

180

199.4

198.2

–

147.5

127

70.8

149

147

124.5

141.4

121.3

–

HBO₂

–

25.4

24.6

34.6

46.3

51.9

43.4

45.8

53.5

–

–

64.3

–

TDS

5372

7060

6965

8954

9662

9658

10354

12005

13259

14737

15593

16697

247.07