کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4472156 1315059 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Photoacoustic infrared spectroscopy for conducting gas tracer tests and measuring water saturations in landfills
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
پیش نمایش صفحه اول مقاله
Photoacoustic infrared spectroscopy for conducting gas tracer tests and measuring water saturations in landfills
چکیده انگلیسی

Gas tracer tests can be used to determine gas flow patterns within landfills, quantify volatile contaminant residence time, and measure water within refuse. While gas chromatography (GC) has been traditionally used to analyze gas tracers in refuse, photoacoustic spectroscopy (PAS) might allow real-time measurements with reduced personnel costs and greater mobility and ease of use. Laboratory and field experiments were conducted to evaluate the efficacy of PAS for conducting gas tracer tests in landfills. Two tracer gases, difluoromethane (DFM) and sulfur hexafluoride (SF6), were measured with a commercial PAS instrument. Relative measurement errors were invariant with tracer concentration but influenced by background gas: errors were 1–3% in landfill gas but 4–5% in air. Two partitioning gas tracer tests were conducted in an aerobic landfill, and limits of detection (LODs) were 3–4 times larger for DFM with PAS versus GC due to temporal changes in background signals. While higher LODs can be compensated by injecting larger tracer mass, changes in background signals increased the uncertainty in measured water saturations by up to 25% over comparable GC methods. PAS has distinct advantages over GC with respect to personnel costs and ease of use, although for field applications GC analyses of select samples are recommended to quantify instrument interferences.


► Photoacoustic infrared spectroscopy tested for measuring tracer gas in landfills.
► Measurement errors for tracer gases were 1–3% in landfill gas.
► Background signals from landfill gas result in elevated limits of detection.
► Technique is much less expensive and easier to use than GC.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Waste Management - Volume 32, Issue 2, February 2012, Pages 297–304
نویسندگان
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