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[en] The IAEA, in collaboration with the University of Massachusetts, has developed an innovative method for tracing the origin of nitrogen pollution in lakes, seas and rivers. The nuclear-derived analytical tool provides a cheaper, safer and faster way to determine whether excessive nitrogen compounds in water stem from agriculture, sewage systems or industry, helping prevention and remediation efforts.Nitrogen, an essential and abundant element on earth, is an important fertilizer that has been widely used in agriculture since the mid- 1900s.