|Ultima descărcare din IBN:|
| SM ISO690:2012|
SANDU, Maria; MOSANU, Elena; TARITA, Anatol; LOZAN, Raisa; GOREACIOC, Tatiana; TURCAN, Sergiu. Index of ammonia ions nitrification in laces water. In: Ştiinţele vieţii în dialogul generațiilor: conexiuni dintre mediul academic, universitar și de afaceri. 21-22 octombrie 2019, Chişinău. Chișinău, Republica Moldova: Tipogr. "Biotehdesign", 2019, pp. 169-170.
|Ştiinţele vieţii în dialogul generațiilor: conexiuni dintre mediul academic, universitar și de afaceri 2019|
Conferința "Life sciences in the dialogue of generations: connections between universities, academia and business community" |
ed. IV, Chişinău, Moldova, 21-22 octombrie 2019
Unpolluted natural waters contain small amounts of ammonia and ammonia compounds, usually <0,1 mg/L nitrogen. Total ammonia concentration in surface water are typically less than 0,2 mg/L N but may reach 2-3 mg/L N . If in natural waters have been given ammonia and nitrogen concentrations more than 1 mg/L, that is as indicator of organic pollution (livestock, intensive agriculture, industrial effluents and liberation of domestic sewage) in courses of superficial waters. The concentration higher than 2,5 mg/L can be toxic to aquatic species . In the nitrogen cycle the oxidation of ammonia to nitrate by microorganisms is a key process, resulting in nitrogen loss from ecosystems, eutrophication of surface and ground waters. One Nitrification Index (NI) was proposed for chloraminated drinking water in distribution system . In order to evaluate the nitrification process in surface waters was developed a nitrification index (Initrif) , which characterizes the intensity of ammonium nitrification under natural conditions with the formula (in mg/L N): Initrif = (N-NO3 · 100) : (N-NO3- + N-NO2-+ N-NH4+) In this study was determinates the ammonia, nitrite and nitrate nitrogen content in laces from State Protected Areas in comparison with Salas lace and Ghidighici basine water for calculation of the Nitrification Index (Initrif.). It has been found that the Initrif of laces water from Landscape Reserve, Telita Noua village, has value of 1731%, in Salas lace 50%, and in Ghidighici basin Initrif is of 26-42% (table). The index of nitrification correlated positive with O2 Saturation (y = 3,05x + 88,05, R2 = 0,1063) and Index of Water Pollution (IWPcc) , y = 4,3x + 42,3, R2 = 0,4856, and negative with self purification capacity (SPC), y = -0,022x + 0,3; R2 = 0,5084.Based on obtained values it is concluded that the index of nitrification is small (till 50%) in all water basins, being dependent of O2 saturation, level of water pollution and self purification capacity.