Date:   9/1/2007 8:35:02 PM ( 17 y ago)
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URL:   https://www.curezone.org/forums/fm.asp?i=955038

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Article says: naturally occuring deposits stirred up by the last few decades of agricultural irrigation methods...

But no doubt the monsoon season plays a big part in having this all come about... if one place on earth that could use a drought(i.e. less rain fall), it would be this place.

This is not in this article, but over the decades there has been massive deforestation going on in Nepal and probably elswhere in the Himalayan ranges north, causing Bangladesh to be constantly overwhelmed by the floods that run down from there... lots of erosion going on there because of this... perhaps arsenic being leached out of the soil also running down the mountains, adding to the problem of having these huge deposits to exist there...

http://www.bssnews.net/environment.php
Arsenic Poisoning
Some experts say that arsenic beneath Bangladesh’s fertile river delta was probably deposited long ago after being washed down from the ores in the Himalayas. For long, the arsenic compounds called arsenic sulphides were submerged in groundwater and remained inert. But with the advent of intensive irrigation in the 1960s, the aquifers started to drop, exposing the poisons to oxygen for the first time. Once oxidised, arsenic sulphides become water-soluble. They percolate from the sub-soils into the water tables during every monsoon flood like drops of tea seeping from a tea bag.

Late Amjad Hussain Khan, a Bangladeshi water expert, reportedly observed in 1997 that the arsenic contamination had originated in the Indian state of West Bengal bordering Bangladesh — particularly on the eastern side of the Ganges-Bhagirathi rivers. The deadly poison then slowly seeped into Bangladesh’s groundwater. He said that the western border districts, specially the southern-western region of Bangladesh, were particularly vulnerable to arsenic contamination . The reason is that the sediments on both sides of the border have the same depositional history and geological environment— the region being commonly known as the Ganges delta. Khan said that the aquifer of the contaminated zones in West Bengal and that of the areas within Bangladesh were hydrologically connected. He further observed that the groundwater of the region along the south-western border belt of Bangladesh is highly vulnerable to arsenic contamination.
 

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