Introduction

Simultaneous time-resolved inorganic haloamine measurements enable analysis of disinfectant degradation kinetics and by-product formation

“…PTR-ToF-MS is an analytical technique that uses chemical ionization with hydronium ion (H 3 O + ) to measure gas phase volatile organic compounds (VOCs) as well as inorganic compounds at single parts per trillion concentrations 23 . Chemical ionization is a "soft ionization" process that results in signi cantly less fragmentation than electron ionization commonly used with MIMS because less energy is imparted on the parent compound when it is ionized 24 . One group of researchers utilized H 3 O + as a chemical ionization source in conjunction with MIMS and found that chloramines and NH 2 Br degraded signi cantly within the membrane such that the signals for the parent compounds were weaker than those of decay products 25 ; an issue that negated the advantages of chemical ionization when used in conjunction with MIMS.…”