Adjusted blank correction method for UV–vis spectroscopic analysis of PTIO-coated filters used in nitrogen oxide passive samplers
作者： Cindy DeForest Hauser , Paul Battle , Nina Mace
DOI: 10.1016/J.ATMOSENV.2008.12.022
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摘要: Abstract Passive sampling devices are popular in applications which do not require the monitoring of hourly concentrations. Nitrogen oxides often collected using filters coated with 2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (PTIO). The filter extract can then be analyzed flow injection analysis ion chromatography fitted a copper/cadmium reduction column or UV–vis spectroscopy. When latter is used to measure low concentrations nitrogen oxides, absorbance by PTIO at analytical wavelength 545 nm contributes significantly. concentration on also shows variation storage and exposure time accounted for single point blank subtraction wavelength. A method presented that uses scaling factor account variations field provides more accurate determining correcting contribution absorption when measuring ambient oxide
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