Deep wells considered safe may be arsenic time-bombs
from Sci Dev Net
Wells deeper than 170 meters in Vietnam's Mekong Delta contain higher levels of arsenic than shallower ones, a study reports — prompting scientists to question the tradition of digging deeper for cleaner water. The study found that the number of wells with arsenic contamination higher than 10 micrograms per liter — the safe limit set by the WHO — is seven times higher in the deeper than shallower zones.
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