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Triazine compounds are used world-widely for the long-term control of annual grass and broad-leaved weeds,due to their ability to kill plants by interfering with photosynthesis.The extensive use of triazine atrazine has resulted in groundwater contamination by the pesticide in many areas,including some groundwater sources in Finland.In soil surface atrazine and terbutryn is degraded in few months by microorganisms,however,the degradation rate of microbes often decreases with increasing the depth in soil and some of pesticides are stored at deep sediments for years.The chemical degradation of atrazine usually is slow.