کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10530053 | 960840 | 2005 | 18 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Measurement of gaseous and aqueous trace formaldehyde
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
The measurement of atmospheric formaldehyde has been of interest to the corresponding author for the last two decades. The initial approach based on the Hantzsch reaction with 2,4-pentanedione (PD) and ammonium acetate was later abandoned in favor of 1,3-cyclohexanedione (CHD) as the β-diketone because of an order of magnitude better limits of detection (LOD). Subsequently, it was discovered that at very high H2O2 to HCHO ratios, the CHD chemistry has a perceptible positive interference from H2O2. In this paper, we review techniques for the measurement of HCHO that have appeared since an account of a CHD-based instrument to measure HCHO was last published, outline our rationale to return to PD-based chemistry, and show that nearly equivalent LODs (16 nM aqueous, 3 pmol, 70 pptv gaseous) can be obtained with reagent components that are separated rather than a single mixed reagent in combination with a fluorescence detector that utilizes multiple high intensity light emitting diodes (LEDs) for excitation without the benefit of a Teflon AF based waveguide, the use of which has become more difficult due to legal restrictions. We present design and construction details of both a ground-based instrument and an instrument intended for aircraft use and provide illustrative field data for both.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 531, Issue 1, 21 February 2005, Pages 51-68
Journal: Analytica Chimica Acta - Volume 531, Issue 1, 21 February 2005, Pages 51-68
نویسندگان
Jianzhong Li, Purnendu K. Dasgupta, Winston Luke,