title: Nitrification Activity of Water Sources in Dnipropetrovsk Region (Ukraine)
abstract: In the decentralized water supply sources all tacsons, except 6 tacson, had an unfavorable self-purification processes and incompleteness of nitrification activity. Therefore the average annual indicators in the water samples, carried out in 1 – 5 tacsons, increased in dynamics by the nitrogen ammonia: from (0.24±0.05) to (0.43±0.20) mg/dm<sup>3</sup>, i.e. in 2.0 times, in comparison with content of nitrates: (5.95±0.06) to (14.72±5.57) mg/dm<sup>3</sup>, which increased in 2.5 times (p < 0.001
journal: Hydrology