کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4441992 1311132 2009 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Adjusted blank correction method for UV–vis spectroscopic analysis of PTIO-coated filters used in nitrogen oxide passive samplers
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علم هواشناسی
پیش نمایش صفحه اول مقاله
Adjusted blank correction method for UV–vis spectroscopic analysis of PTIO-coated filters used in nitrogen oxide passive samplers
چکیده انگلیسی

Passive sampling devices are popular in applications which do not require the monitoring of hourly concentrations. Nitrogen oxides are 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 using flow injection analysis ion chromatography fitted with a copper/cadmium reduction column or UV–vis spectroscopy. When the latter is used to measure low concentrations of nitrogen oxides, absorbance by PTIO at the analytical wavelength of 545 nm contributes significantly. PTIO concentration on the filter also shows variation with filter storage and exposure time not accounted for in a single point blank subtraction at the analytical wavelength. A method is presented that uses a scaling factor to account for variations in concentration of PTIO on the field blank and provides a more accurate method for determining and correcting for the PTIO contribution to absorption when measuring ambient nitrogen oxide concentrations.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Atmospheric Environment - Volume 43, Issue 10, March 2009, Pages 1823–1826
نویسندگان
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