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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Water Treatment

Background:

  • Chloramination of bromide-containing water produces bromochloramine (NHBrCl).
  • Existing analytical methods struggle with accurate NHBrCl quantification due to interferences.
  • Pure NHBrCl solutions are difficult to prepare, hindering method development.

Purpose of the Study:

  • To develop an interference-free analytical method for accurate NHBrCl quantification.
  • To establish a reliable method for mechanistic studies on NHBrCl in water treatment.

Main Methods:

  • Quantification of NHBrCl using membrane introduction mass spectrometry (MIMS).
  • Determination of the molar absorption coefficient for NHBrCl via HPLC-UV comparison.
  • Establishment of a MIMS calibration curve using the m/z 131 signal.

Main Results:

  • A molar absorption coefficient of 304 M⁻¹cm⁻¹ was determined for NHBrCl.
  • MIMS provided unambiguous quantification based on the unique m/z 131 ion.
  • A limit of detection of 2.9 μM (378 μg/L) was achieved.

Conclusions:

  • MIMS offers the only unambiguous method for NHBrCl quantification.
  • While the detection limit is not suitable for drinking water, the method aids mechanistic research.
  • This advancement will facilitate studies on NHBrCl's contribution to toxic disinfection by-products.