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Wajrak, Magdalena – School Science Review, 2011
Natural arsenic salts are present in all waters, with natural concentrations of less than 10 parts per billion (ppb). Unfortunately, there is an increasing number of countries where toxic arsenic compounds in groundwater, which is used for drinking and irrigation, have been detected at concentrations above the World Health Organization's…
Descriptors: Water, Foreign Countries, Safety, Science Equipment