One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, such as the rate of change in the concentration of reactants or products with time. 615-36-1, Name is 2-Bromoaniline, formurla is C6H6BrN. In a document, author is Liao, Xiaobin, introducing its new discovery. Application In Synthesis of 2-Bromoaniline.
New perspective of Br-‘s role on NDMA formation from daminozide (DMNZD) during ozonation
N-nitrosodimethylamine (NDMA) has recently been discovered to generate from daminozide (DMNZD) during ozonation. Moreover, its formation is affected by the presence of bromine ion (Br-) in water, but the mechanism is still unclear. In this study, the effect of Br- on NDMA formation from DMNZD during ozonation at various oxidation conditions (ozone dosages, pH) and distinct water parameters was studied. In addition, the transformation pathways with/without Br- were determined. The results demonstrated that low levels of Br- promoted NDMA formation from DMNZD during ozonation. When Br- dosages increased from 0 to 1 mu M, the concentration of NDMA augmented from 138 to 195.5 mu g/L. However, when Br- concentration raised to 100 mu M, NDMA amounts dropped to 80 mu g/L. Increasing pH can raise the ratio of deprotonated DMNZD no matter with or without Br-, and promote its reaction with O-3 molecular to achieve the maximum NDMA formation at pH = 7. The amounts of NDMA decreased dramatically (from 155 to 74 mu g/L) when HCO3- dosages increased from 0 to 160 mu M with 0.1 mu M Br-, however, its concentration increased remarkably (from 155 to 225 mu g/L) with increasing SO42- (from 0 to 20 mu M). Low levels of HA (0.1-0.2mg/L) boosted NDMA formation while relatively abundant of HA (>= 0.4 mg/L) suppressed its formation. In addition, the presence of NOM inhibited NDMA formation from DMNZD during ozonation no matter Br- existed or not. Based on the results of LC/MS/MS, GC/MS and IC-MS, the transformation pathways of DMNZD with/without Br(-)during ozonation were proposed. This study provided new insights into the role of Br- on NDMA formation from typical amine compounds during ozonation. (C) 2019 Elsevier B.V. All rights reserved.
If you are hungry for even more, make sure to check my other article about 615-36-1, Application In Synthesis of 2-Bromoaniline.