R. Rando, H. Poovey
Feb 1, 1993
Citations
0
Influential Citations
1
Citations
Journal
Applied Occupational and Environmental Hygiene
Abstract
Abstract A new solid sorbent has been developed that is suitable for personal monitoring of exposure to chlorine. The sorbent was prepared from silica gel coated with 2,6-dimethylphenol (DMP), sodium bromide, and sulfuric acid. Chlorine oxidizes bromide to bromine, which then brominates DMP to form 4-bromo-2,6-dimethylphenol (BDMP) through electrophilic aromatic substitution. The direct reaction of chlorine with DMP to form 4-chloro-2,6-dimethylphenol was found to be unsuitable due to competing reactions. BDMP was desorbed with methanol and determined by gas chromatography (GC) with flame ionization detection or high-performance liquid chromatography (HPLC) with ultraviolet absorbance detection. Recovery of collected chlorine as BDMP was quantitative from 0.05 to at least 2 ppm for 20-L air samples, and precision and accuracy were within National Institute for Occupational Safety and Health guidelines. Limits of detection for a 20-L air sample were approximately 10 ppb chlorine, when analyzed by either GC...