On-line monitoring of chloramine reactions by membrane introduction mass spectrometry

Time persistence of monochloramine in human saliva and stomach fluid

“…Saliva is a complex mixture of different inorganic and organic compounds typically having a neutral pH (9). However, the formation of dichloramine, trichloramine, or molecular chlorine was not observed in stomach fluid whereas these compounds are observed in acidified water (10). The inorganic compounds include ions such as chloride, nitrite, iodide, and thiocyanate.…”

“…The pressure difference across the membrane is the main driving force for analytes to pass through the membrane. The application area of interest to this study is the use of MIMS in the direct analysis of inorganic (10,21) and organic chloramines (22) at sub-part-per-million levels without isolation or derivatization. The ready availability of silicone polymers, which pass small organic molecules in preference to water, allows the direct analysis of aqueous solutions.…”

“…The possible formation of dichloramine, trichloramine, and molecular chlorine, all of which can be analyzed by MIMS (10) and each of which may be formed from monochloramine solutions under acidic conditions (8,9,24,25), was also followed. The possible formation of dichloramine, trichloramine, and molecular chlorine, all of which can be analyzed by MIMS (10) and each of which may be formed from monochloramine solutions under acidic conditions (8,9,24,25), was also followed.…”

Polyurethane foams as solid chromogenic reagents for diffuse reflectance spectroscopy

“…The infrared data show that chlorination of the carbon skeleton does not occur when PUF interacts with active chlorine. Otherwise, an intense band arising from C-Cl bond vibrations would be observed in the spectral range where the polymer does not absorb (700-800 cm -1 [28]). …”

“…Shape changes occur in the 1600-1650 cm -1 region and some absorption bands are shifted, probably because of the formation of a -C=N-bond, the characteristic vibration of which lies at 1650 cm -1 [28].…”