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Table 3 Summary of key water quality parameters classified by water type

From: Salinization and arsenic contamination of surface water in southwest Bangladesh

Parameter

Blank

Fresh water pond

Rice paddies

Rain water

Shrimp ponds

Tidal channel Oct.

Tidal channel May

Tube well

Number n

4

44

18

3

18

9

14

81

Avg.

1 σ

Avg.

1 σ

Avg.

1 σ

Avg.

1 σ

Avg.

1 σ

Avg.

1 σ

Avg.

1 σ

Avg.

1 σ

Eh (mV)

  

273

126

276

77

173

68

325

162

246

78

279

141

69

97

pH

  

8.2

0.6

8.2

0.7

7.3

1.2

8.1

0.4

7.8

0.8

7.4

0.4

6.9

0.4

Salinity (ppt)

  

1.02

0.69

0.91

0.55

0.02

0.02

14.76

3.91

0.43

0.26

15.14

4.48

3.64

2.00

Geom. mean As (μg/L)

−2.22

 

−2.0

0.3

−2.3

0.4

  

−1.8

0.4

−2.4

0.4

−1.8

0.4

−1.4

0.6

Geom. mean S (mg/L)

−0.63

0.67

1.6

0.3

1.4

0.4

−0.4

0.3

2.7

0.2

1.0

0.3

2.8

0.1

0.7

0.8

Geom. mean DOC (mg/L)

0.59

0.18

1.0

0.2

0.8

0.1

0.2

0.1

1.2

0.3

0.8

0.2

0.8

0.2

1.4

0.2

>10 μg/L As

  

41%

 

22%

 

0%

 

78%

 

11%

 

71%

 

83%

 

>50 μg/L As

  

2%

 

0%

 

0%

 

11%

 

0%

 

7%

 

47%

 

>2 mS/cm

  

36%

 

28%

 

0%

 

100%

 

11%

 

100%

 

100%

Â