Articolul precedent |
Articolul urmator |
651 1 |
Ultima descărcare din IBN: 2022-08-13 19:57 |
SM ISO690:2012 SPATARU, Petru, TRANCALAN, Ana, POVAR, Igor. Study of stable nitrogen forms in natural surface waters in the presence of mineral substrates. In: The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova, 28-30 mai 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Chimie al AȘM, 2014, p. 183. |
EXPORT metadate: Google Scholar Crossref CERIF DataCite Dublin Core |
The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova 2014 | ||||||
Conferința "The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova" Chișinău, Moldova, 28-30 mai 2014 | ||||||
|
||||||
Pag. 183-183 | ||||||
|
||||||
Descarcă PDF | ||||||
Rezumat | ||||||
The impact of gravel, polymer film and aeration of the reduced nitrogen forms in surface |
||||||
|
Cerif XML Export
<?xml version='1.0' encoding='utf-8'?> <CERIF xmlns='urn:xmlns:org:eurocris:cerif-1.5-1' xsi:schemaLocation='urn:xmlns:org:eurocris:cerif-1.5-1 http://www.eurocris.org/Uploads/Web%20pages/CERIF-1.5/CERIF_1.5_1.xsd' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' release='1.5' date='2012-10-07' sourceDatabase='Output Profile'> <cfResPubl> <cfResPublId>ibn-ResPubl-106311</cfResPublId> <cfResPublDate>2014</cfResPublDate> <cfStartPage>183</cfStartPage> <cfISBN></cfISBN> <cfURI>https://ibn.idsi.md/ro/vizualizare_articol/106311</cfURI> <cfTitle cfLangCode='EN' cfTrans='o'>Study of stable nitrogen forms in natural surface waters in the presence of mineral substrates</cfTitle> <cfAbstr cfLangCode='EN' cfTrans='o'><p>The impact of gravel, polymer film and aeration of the reduced nitrogen forms in surface<br />waters was studied in a previous paper [1]. Authors [1] found that gravel, polymer film and<br />aeration caused the acceleration of decreasing ammonia content in water. Gravel and polymeric<br />film speeded up the oxidation process of ammonia, while the aeration diminished its amount. In<br />this paper, the ammonium ion oxidation in the water samples, in the presence and absence of<br />mineral substrates, has been investigated. The presence of granite and expanded clays speeds the<br />oxidation of ammonium ion by 12 days in the case of downstream of the South Racovat River.<br />The time of oxidation of ammonium ion in the presence of these substrates is 7 days, while in<br />their absence is 20 days. The ammonium ion oxidation for samples with granite has an<br />insignificant delay in comparison with expanded clays, while the formation and decrease of the<br />nitrite ion concentration is favored for clays by 3-4 days with the maximum difference in the<br />concentration of 1 mg/L. The water models from the Isnovat River, in which the impact of<br />granite, ceramsite, calcium carbonate and their combination have been investigated, demonstrate<br />that separate granite and ceramsite as well as their combination have a significant influence on<br />the dynamics of nitrification. The addition of calcium carbonate slows down the oxidation of<br />reduced forms of nitrogen. The adding up of CaCO3 causes a larger effect on more polluted<br />water samples in the Ungheni section after WWTP than on less polluted ones in the Sculeni<br />section. On the other hand, the largest effect is registered for the highly polluted by cationic<br />detergents waters in the Varancau section of the Nistru River downstream of the Soroca city. In<br />the water samples without substrates, both the NH4<br />+ oxidation and the NO3<br />- reduction to the<br />NO2<br />- ions take place to their greater extent of nitrite formation (4-5 mg/L). The ammonium<br />oxidation is practically blocked by adding CaCO3 to the water samples. For the samples taken<br />from the Nistru River near to the Bursuc village the effect of calcium carbonate is smaller, but<br />still noticeable. In the case of the Cunicea village vicinity, where the river water is not polluted<br />by detergents, the nitrification dynamic of ammonia and nitrite ions with and without CaCO3 is<br />more or less similar.<br />As a result, granite and expanded clay substrates as well as their combination have a<br />comparable effect in supporting the oxidation of nitrogen reduced forms in natural surface<br />waters. Concomitantly, CaCO3 blocks abovementioned process, essentially for highly polluted<br />waters. Our research proves again that the organic pollutants, especially the cationic ones,<br />produce a noticeable impact on the ammonia oxidation process dynamics in natural waters.<br />References:<br />[1] Sandu, M.; Spataru, P.; Arapu, T.; Lupascu, T. Biochemical oxidation – a pathway for<br />ammonia removal from aquatic systems. In: „Methods and Techniques for Cleaning-up<br />Contaminated Sites”, Springer, 2008, 137-143.</p></cfAbstr> <cfResPubl_Class> <cfClassId>eda2d9e9-34c5-11e1-b86c-0800200c9a66</cfClassId> <cfClassSchemeId>759af938-34ae-11e1-b86c-0800200c9a66</cfClassSchemeId> <cfStartDate>2014T24:00:00</cfStartDate> </cfResPubl_Class> <cfResPubl_Class> <cfClassId>e601872f-4b7e-4d88-929f-7df027b226c9</cfClassId> <cfClassSchemeId>40e90e2f-446d-460a-98e5-5dce57550c48</cfClassSchemeId> <cfStartDate>2014T24:00:00</cfStartDate> </cfResPubl_Class> <cfPers_ResPubl> <cfPersId>ibn-person-12324</cfPersId> <cfClassId>49815870-1cfe-11e1-8bc2-0800200c9a66</cfClassId> <cfClassSchemeId>b7135ad0-1d00-11e1-8bc2-0800200c9a66</cfClassSchemeId> <cfStartDate>2014T24:00:00</cfStartDate> </cfPers_ResPubl> <cfPers_ResPubl> <cfPersId>ibn-person-41092</cfPersId> <cfClassId>49815870-1cfe-11e1-8bc2-0800200c9a66</cfClassId> <cfClassSchemeId>b7135ad0-1d00-11e1-8bc2-0800200c9a66</cfClassSchemeId> <cfStartDate>2014T24:00:00</cfStartDate> </cfPers_ResPubl> <cfPers_ResPubl> <cfPersId>ibn-person-14860</cfPersId> <cfClassId>49815870-1cfe-11e1-8bc2-0800200c9a66</cfClassId> <cfClassSchemeId>b7135ad0-1d00-11e1-8bc2-0800200c9a66</cfClassSchemeId> <cfStartDate>2014T24:00:00</cfStartDate> </cfPers_ResPubl> </cfResPubl> <cfPers> <cfPersId>ibn-Pers-12324</cfPersId> <cfPersName_Pers> <cfPersNameId>ibn-PersName-12324-3</cfPersNameId> <cfClassId>55f90543-d631-42eb-8d47-d8d9266cbb26</cfClassId> <cfClassSchemeId>7375609d-cfa6-45ce-a803-75de69abe21f</cfClassSchemeId> <cfStartDate>2014T24:00:00</cfStartDate> <cfFamilyNames>Spataru</cfFamilyNames> <cfFirstNames>Petru</cfFirstNames> <cfFamilyNames>Спатару</cfFamilyNames> <cfFirstNames>Петру</cfFirstNames> </cfPersName_Pers> </cfPers> <cfPers> <cfPersId>ibn-Pers-41092</cfPersId> <cfPersName_Pers> <cfPersNameId>ibn-PersName-41092-3</cfPersNameId> <cfClassId>55f90543-d631-42eb-8d47-d8d9266cbb26</cfClassId> <cfClassSchemeId>7375609d-cfa6-45ce-a803-75de69abe21f</cfClassSchemeId> <cfStartDate>2014T24:00:00</cfStartDate> <cfFamilyNames>Trancalan</cfFamilyNames> <cfFirstNames>Ana</cfFirstNames> </cfPersName_Pers> </cfPers> <cfPers> <cfPersId>ibn-Pers-14860</cfPersId> <cfPersName_Pers> <cfPersNameId>ibn-PersName-14860-3</cfPersNameId> <cfClassId>55f90543-d631-42eb-8d47-d8d9266cbb26</cfClassId> <cfClassSchemeId>7375609d-cfa6-45ce-a803-75de69abe21f</cfClassSchemeId> <cfStartDate>2014T24:00:00</cfStartDate> <cfFamilyNames>Повар</cfFamilyNames> <cfFirstNames>Игорь</cfFirstNames> </cfPersName_Pers> </cfPers> </CERIF>