S. No

 

Location

 

No. of samples

 

Season

 

Minimum

 

Maximum

 

Mean

 

SD

No. of samples with             Fluoride level  (mg/l)

< 0.50

0.51 – 1.5

> 1.5

1.

Rameswaram temple

22

Summer

0.34

1.46

0.90

0.37

04

18

00

22

Winter

0.06

1.56

0.87

0.37

03

17

02

2.

R – D tract

71

Summer

WDL

3.08

1.08

0.74

18

30

20

40

Winter

WDL

1.92

0.45

0.55

26

12

02

3.

R – U  Northern tract

61

Summer

WDL

2.96

1.23

0.65

07

39

15

30

Winter

WDL

2.12

0.92

0.53

07

21

02

4.

R – U Southern  tract

51

Summer

WDL

2.50

1.06

0.60

12

27

12

35

Winter

WDL

2.02

0.79

0.56

12

20

03

5.

Residential area

50

SW

WDL

1.84

0.56

0.40

24

24

02

21

NE

0.16

1.84

0.88

0.46

04

05

03

16

NW

WDL

1.64

0.64

0.54

08

06

02

 

Total

419

 

 

 

 

 

  125

      231

63


WDL – Within Detectable Level; SD – Standard Deviation

Table 1: Summary of Fluoride level in the groundwater samples of the study area