The fluctuation ranges of the chemical compound concentrations in water of the Lena mouth area

The investigation is based on analysis of long standing (1980-2007) hydrochemical data from The State Service of Supervision, showing high spatial-time changing of the pollutants and nutrient compounds. The fluctuation ranges of the nutrient compound concentrations are distinguished between the river boundary area (the village Kusur), head of the delta (the village Habarova), the bay Neelov (the village Tiksi). The accumulation in the water of the biogenic compounds and prioritive pollutants to concentrations above established MPC2 results in formation of anthropogenically modified natural background which deviates from the range of the most often occurring values.