date:Jun 05, 2012
sources were at risk of contamination.
Risk of contamination
Nitrates were naturally present in water, the study said, but higher levels indicated contamination, whether from human or animal waste, fertilizers, septic tanks or sewage disposal.
Although not a direct toxicant in itself, nitrate was linked to a range of human health problems on conversion to nitrite, the researchers explained, where the latter can form N-nitro so compounds that are probably carcinogenic in humans
Excessive