This document discusses acid sulfate soils (ASS), including potential ASS, actual or active ASS, and post-active ASS materials. It mentions that acid sulfate soils are formed by the oxidation of iron sulfides like pyrite in low-lying coastal areas. The table shows estimates of acid sulfate soil areas in various regions around the world, with Indonesia, Australia, and Brazil having the largest estimated areas. It also describes some of the wetland areas in Sri Lanka's southwestern coastal belt that contain acid sulfate soils, and notes that acid sulfate soils can adversely impact the environment if not properly managed.

1. Rathnappriya R.H.K.

2. 2

3. Potential ASS
Actual (or active) ASS
Post-active ASS materials
3

4. 4
(Rosicky et al., 2000, Lines-Kelly, 2000 and Bigham and Nordstrom, 2000)

5. 5

6. 6
(Fanning et al., 2002)

7. 7
(Fanning et al., 2002)

8. 8
Acidithiobacillus ferrooxidans
FeS2 (Pyrite)
+
Oxygen
+
Water

9. 9

10. 10
(Maciejowski, 2012, Andriesse and Mensvoort, 2002 and Shamshuddin et al., 2004)

11. Region Area (*103 ha)
Australia 3000
Bangladesh 226
Brazil 1111
China 100
Central America 650
India 293
Indonesia 4109
Kampuchia 211
Kenya <100
Sweden 140
Sri Lanka 30
Madagascar 528
Malaysia 657
Myanmar 1200
Nigeria 1000
North America 100
Philippines <500
Senegal 600
Thailand 1500
Uruguay 37
Venezuela 2000
Vietnam 2140 11
(Santharooban S. and Muralitharan S.D..2008)

12. 12
The South-Western coastal
belt consist;
• Negombo lagoon
• Lunawa lagoon
• Muthurajawela salt
marshes
• Wetlands
• Mangrove vegetation
etc.
(Fernando and Suranganee, 2009 and Santharooban S. and Muralitharan S.D.,2008)

13. 13

14. 14
(Deturck et al.)

15. 15

16. 16
(Deturck et al.)

17. 17
(Chandasiri and Pathirana, 1995)

18. 18
(EPA VICORIYA)

19. 19
(EPA VICORIYA)

20. 20
(EPA VICORIYA)

21. 21
(EPA VICORIYA)

22. 22
(EPA VICORIYA)

23. 23
(Government of South Australia)

24. 24
Epizootic Ulcerative
Syndrome

25. 25

26. 26

27. 27
(Fitzpatrick et al., 2008i)

28. 28
(Fitzpatrick et al., 2008i)

29. 29
(Fitzpatrick et al., 2008i)

30. 30
(Fitzpatrick et al., 2008i)

31. 31

32. 32

33. 33

34. 34

35. 35

36. 36