Inscriere cercetatori

Premii Ad Astra

premii Ad Astra

Asociația Ad Astra anunță lansarea proiectului Premiilor Ad Astra 2022 (link aici), care își propune identificarea și popularizarea modelelor de succes, a rezultatelor excepționale ale cercetătorilor români din țară și din afara ei. Regulamentul de participare se poate gasi aici, iar  pagina de inscriere se poate accesa aici.

Asociatia Ad Astra a cercetatorilor romani lanseaza BAZA DE DATE A CERCETATORILOR ROMANI DIN DIASPORA. Scopul acestei baze de date este aceea de a stimula colaborarea dintre cercetatorii romani de peste hotare dar si cu cercetatorii din Romania. Cercetatorii care doresc sa fie nominalizati in aceasta baza de date sunt rugati sa trimita un email la cristian.presura@gmail.com

Formation and Stability of mono-, di- and trichloramine in Water Solutions I. Monochloramine

Autori: Corneliu Bogatu, Vasile Pode, Ilie Vlaicu, Aurel Iovi

Editorial: Petru Filip, SC Biblioteca Chimiei SA, Revista de Chimie (Bucureşti), 60 (2), p.189-192, 2009.

Rezumat:

Paper objectives were to determine conditions for monochloramine formation in water solutions, its stability against time at pH= 6, 7, and 8, for two series of chlorine : ammonia mass ratios (R), 1:1-8:1 and 2 :2-12:2 (mg/L:mg/L), at 200 C. Maximum monochloramine concentrations were recorded for the ratios 3:1 and 4.18:1 in the first minutes after reagents mixing: 1.8-2.3 mg/L (pH = 6.0), 2.4-3.0 mg/L (pH = 7.0), 2.7-3.7 mg/L (pH = 8.0). For the second series the maximum concentration, 5.6 mg/L, was recorded at pH = 7.0 and R = 4.18:1. Due to monochloramine autodecomposition, at 24 hours after reagents mixing for R = 3:1 and 4.18:1, the following percents from initial concentrations were determined: 60.8-72.2 % (pH = 6.0), 80.0-83.3 % (pH = 7.0), 96.2- 97.2 % (pH = 8).These results are useful to natural water treatment for drinking purpose.

Keywords: monochloramine, dichloramine, mass ratios, pH, stability

URL: http://www.revistadechimie.ro/pdf/BOGATU%20C..pdf