MilliporeSigma
  • Effect of bromide on NDMA formation during chloramination of model precursor compounds and natural waters.

Effect of bromide on NDMA formation during chloramination of model precursor compounds and natural waters.

Water research (2019-12-04)
Wilson Beita-Sandí, Cagri Utku Erdem, Tanju Karanfil
ABSTRACT

In this work, we investigated the effect of bromide ion (Br-) on NDMA formation using model precursor compounds, wastewater effluents and surface waters. Previous studies showed that Br- reacts with chloramines and forms bromochloramine, a reactive compound responsible for NDMA formation enhancement. Some limitations of those studies were the highest Br- concentrations used, and the limited number of precursors considered. Here, we observed enhancement of NDMA formation from most of the model precursor compounds within the Br- range (0-1000 μg/L) but this effect was suppressed in the presence of NOM. Also, NDMA formation was favored at pH 8 in the presence of Br- compared to pH 6. Nevertheless, Br- suppressed NDMA formation in wastewater effluent samples at low monochloramine doses while no effects were observed in surface waters.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
N,N-Dimethylisopropylamine, ≥99%
Sigma-Aldrich
N,N-Dimethylbenzylamine, ≥99%