title: Detection of bromine by ICP-oa-ToF-MS following photochemical vapor generation.
abstract: A unique flow-through photochemical reactor is utilized for the generation of volatile methyl bromide from aqueous solutions of bromide and bromate ions in a medium of 2% acetic acid containing 3000 μg/mL NH4Cl. The volatile product is transported to a thin-film gas-liquid phase separator and directed to an inductively coupled plasma (ICP) tine-of-flight mass spectrometer for detection and quantitation using either of the (79)Br or (81)Br isotopes. Utilizing a sample flow rate of 3.3 mL/min and a 13 s irradiation time, a detection limit of 0.14 ng/mL is achieved, yielding a 17-fold enhancement over conventional solution nebulization. The estimated generation efficiency of 95% provides for a significant increase in analyte transport efficiency to the ICP. Precision of replicate measurement is 2.5% (RSD) at 20 ng/mL. The methodology was validated by successful determination of bromine in reference materials, including IRMM (BCR-611) low level bromide in groundwater, NIST SRM 1568b Rice Flour, and SRM 1632 bituminous coal.
authors: National Research Council of Canada, Measurement Science and Standards , Ottawa, Ontario K1A 0R6, Canada.
authors: Ralph E
authors: RE
authors: Sturgeon
mesh_terms: D001966:Bromine / Q000032:analysis*; D004785:Environmental Pollutants / Q000032:analysis*; D055668:Photochemical Processes; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods*; D013054:Spectrophotometry, Atomic / Q000379:methods*; D014466:Ultraviolet Rays; D014835:Volatilization
chemical_list: D004785:Environmental Pollutants; D001966:Bromine