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SM ISO690:2012 SANDU, Maria, GOREACIOC (ARAPU), Tatiana, LUPASCU, Tudor. The nitrite removal from water with sulfaminic acid. 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. 159. |
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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 | ||||||
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The process of nitrification in natural waters has as a mandatory stage the appearance of |
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<?xml version='1.0' encoding='utf-8'?> <resource xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns='http://datacite.org/schema/kernel-3' xsi:schemaLocation='http://datacite.org/schema/kernel-3 http://schema.datacite.org/meta/kernel-3/metadata.xsd'> <creators> <creator> <creatorName>Sandu, M.A.</creatorName> <affiliation>Institutul de Ecologie şi Geografie al AŞM, Moldova, Republica</affiliation> </creator> <creator> <creatorName>Goreacioc (Arapu), T.L.</creatorName> <affiliation>Institutul de Ecologie şi Geografie al AŞM, Moldova, Republica</affiliation> </creator> <creator> <creatorName>Lupaşcu, T.G.</creatorName> <affiliation>Institutul de Chimie al AŞM, Moldova, Republica</affiliation> </creator> </creators> <titles> <title xml:lang='en'>The nitrite removal from water with sulfaminic acid</title> </titles> <publisher>Instrumentul Bibliometric National</publisher> <publicationYear>2014</publicationYear> <relatedIdentifier relatedIdentifierType='ISBN' relationType='IsPartOf'></relatedIdentifier> <dates> <date dateType='Issued'>2014</date> </dates> <resourceType resourceTypeGeneral='Text'>Conference Paper</resourceType> <descriptions> <description xml:lang='en' descriptionType='Abstract'><p>The process of nitrification in natural waters has as a mandatory stage the appearance of<br />nitrite content in surface waters in Moldova that ranges of 0-10 and more mg/dm3 in small rivers<br />water downstream of sewage discharges, insufficiently treated in biological purification plants<br />type. In water from the Bac river downstream of the Chisinau municipality sometimes more than<br />10 mg/dm3 NO2<br />-; in the Lunga river (village Lunga) - of 3.6 till 12.6 mg/dm3 NO2<br />- and nitrates<br />content - from 0.5 to about 20 mg/dm3 were registered [1].<br />Thus, the assessment of nitrate and nitrite content (NO3<br />- in the presence of NO2<br />-) in the<br />aquatic medium, performed by analytical services for monitoring of natural, drinking, waste<br />waters, food and soil is of major importance.<br />There are various methods for nitrate and nitrite determining, including electrochemical,<br />spectrophotometric, fluorometric, luminescent, electrophoretic and chromatographic methods.<br />For the nitrate determination there are widely used methods based on the principle of<br />nitrate to nitrite preventive reduction, the latter one being determined by the Griess reaction. In<br />all the cases nitrites influence the process.<br />Pre-treatment of water with sulfaminic acid (ASA) allows the removal of the nitrite and<br />nitrosating agents before the nitrates determination after their reduction to nitrite [2, 3].<br />Sulfaminic acid reacts with nitrite and forms free nitrogen, water and sulphuric acid:<br />NH2SO3H + HNO2 N2<br />+ H2SO4 + Н2О<br />It has been established that the nitrite removal from water with sulfaminic acid takes<br />place at pH 1-2.5 during about 25-30 minutes and 3 mg of sulfaminic acid remove nitrite from<br />10 mL solution containing 20 mg/dm3 NO2<br />-.<br />The advantage of the sulfaminic acid use consists of economy, efficiency and ease of use.<br />In the passport of Security according Document 1907/2006/EC, art. 31(24/09/2013, version 3) is<br />mentioned that sulfaminic acid has insignificant effect in the waste water canalization.<br />References:<br />[1] Mustea, M. et al. Starea resurselor de apă. În: Starea mediului în Republica Moldova în 2007-<br />2010 (Raport National). – Ch.: S. n., Tipografia “Nova-Imprim” SRL. – 2011. p. 75-80.<br />[2] Новиков, Ю. В.; Ласточкина, К. О.; Болдина, З. Н. Методы исследования качества воды<br />водоемов. Москва, 1990, 321 с.<br />[3] Mir, Shabir Ahmed. A rapid technique for determination of nitrate and nitric acid by acid<br />reduction and diazotization at elevated temperature. In: Anal. Chim. Acta, 2008, 620 (1-2),<br />183-189.</p></description> </descriptions> <formats> <format>application/pdf</format> </formats> </resource>