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Both soil and underground water of a vast area of the north and southern Bangladesh has already been threatened with arsenic contamination affecting health of millions of people. Arsenic content in soil and underground water has identified higher contamination. The experts at Bangladesh Council for Scientific and Industrial Research (BCSIR) found the highest contamination 14 mg/l of shallow tube well water in Pabna, a northern district and 220 mg/kg of soil in Sylhet area of Bangladesh. The World Health Organization (WHO) standard for arsenic is in between 0.01 and 0.05 mg/l. It is still unresolved the reason of such high contamination of arsenic in the subsurface of Bangladesh.
Inorganic arsenic has been recognized as a human poison since ancient
times and large doses can produce death. One of the major difficulties with
groundwater contamination is that it occurs underground, out of sight. The
pollution sources are not easily observed nor are their effects often
seen until damage has occurred. The tangible effects of groundwater contamination
usually come to light long after the incident causing the contamination has
occurred. Therefore, it has become increasingly important to map out
the stratigraphic occurrence of arsenic in subsurface and then install the
wells in such a manner to avoid it or take essential measures prior to drink
the well water.