Efficacy of passive sampler collection for atmospheric NO<sub>2</sub> isotopes under simulated environmental conditions

Coughlin, Justin G.; Yu, Zhongjie; Elliott, Emily M.

doi:10.1002/rcm.7885

Cited by 6 publications

(5 citation statements)

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“…Ambient NO 2 and/or NO x have also been collected for 15 N analysis using passive samplers (Smirnoff et al, 2012;Dahal and Hastings, 2016) or experimental actively-sampled cartridges (Savard et al, 2017) based on proprietary sampling media (Maxxam Analytics). When NO 2 isotopes have been collected for 15 N analysis and analyzed as nitrite in solution, it has been noted that an additional fractionation factor (~ +27.5 ‰) must be applied when using the denitrifier method to account for an additional oxidation to NO 3 − during bacterial processing (Casciotti et al, 2007;Dahal and Hastings, 2016;Coughlin et al, 2017).…”

Section: ) Advances In Field and Laboratory Methodologiesmentioning

confidence: 99%

“…Nitrogen dioxide (NO 2 ) for isotopic analysis has been captured using passive diffusion samplers that contain a quartz filter impregnated with TEA (Redling et al, 2013;Felix and Elliott, 2014;Dahal and Hastings, 2016). A recent study using control laboratory experiments determined precision and accuracy of passive NO 2 filters as a collection medium for isotopic analysis of δ 15 N and δ 18 O across varying environmental conditions (Coughlin et al, 2017). Another recent study collected δ 15 N and δ 18 O of NO 2 using an active sampling denuder assembly coated with a potassium hydroxide solution, guaiacol, and methanol solution .…”

Section: ) Advances In Field and Laboratory Methodologiesmentioning

confidence: 99%

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Isotopic advances in understanding reactive nitrogen deposition and atmospheric processing

Elliott

Cole

et al. 2019

Science of The Total Environment

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140

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Recent advances in stable isotope measurements now allow for detailed investigations of the sources, transformations, and deposition of reactive nitrogen (N) species. Stable isotopes show promise as a complementary tool for apportioning emissions sources that contribute to deposition and also for developing a more robust understanding of the transformations that can influence these isotope ratios. Methodological advances have facilitated the unprecedented examination of the isotopic composition of reactive N species in the atmosphere and in precipitation including nitrogen oxides (NO x =nitric oxide (NO) + nitrogen dioxide (NO 2 )), atmospheric nitrate (NO 3 − ), nitric acid (HNO 3 ), and NH x ammonia (NH 3 ), and ammonium (NH 4 + )). This isotopic information provides new insight into the mechanisms of transformation and cycling of reactive N in the atmosphere and moreover help resolve the contribution of multiple NO x and NH 3 emission sources to deposition across landscapes, regions, and continents. Here, we highlight the current state of knowledge regarding the isotopic ratios of NO x and NH 3 emission sources and chemical alterations of isotopic ratios during atmospheric transformations. We also highlight illustrative examples where isotopic approaches are used and review recent methodological advances. While these highlights are not an exhaustive review of the literature, we hope they provide a glimpse of the potential for these methods to help resolve knowledge gaps regarding total N deposition to Earth surfaces. We conclude with promising opportunities for future research in the short-, medium-, and long-term.

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Section: ) Advances In Field and Laboratory Methodologiesmentioning

confidence: 99%

Section: ) Advances In Field and Laboratory Methodologiesmentioning

confidence: 99%

Isotopic advances in understanding reactive nitrogen deposition and atmospheric processing

Elliott

Cole

et al. 2019

Science of The Total Environment

Self Cite

140

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“…These measurements were made using passive samplers (Ogawa pads; Ogawa USA, Pompano Beach, FL) that required soil chambers to be permanently closed, prohibiting integration with our automated chambers. The passive sampling pads are chemically pretreated so that they would collect either NO x , NO 2 , or NH 3 and have been demonstrated to work well under warm and humid conditions expected inside our soil chambers (Coughlin et al 2017). We did not detect NO 2 on the NO 2 pads, indicating any N accumulation on the NO x pads was mostly NO.…”

Section: Experimental Designmentioning

confidence: 99%

Rapid nitrate reduction produces pulsed NO and N2O emissions following wetting of dryland soils

et al. 2022

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Soil drying and wetting cycles can produce pulses of nitric oxide (NO) and nitrous oxide (N2O) emissions with substantial effects on both regional air quality and Earth’s climate. While pulsed production of N emissions is ubiquitous across ecosystems, the processes governing pulse magnitude and timing remain unclear. We studied the processes producing pulsed NO and N2O emissions at two contrasting drylands, desert and chaparral, where despite the hot and dry conditions known to limit biological processes, some of the highest NO and N2O flux rates have been measured. We measured N2O and NO emissions every 30 min for 24 h after wetting soils with isotopically-enriched nitrate and ammonium solutions to determine production pathways and their timing. Nitrate was reduced to N2O within 15 min of wetting, with emissions exceeding 1000 ng N–N2O m−2 s−1 and returning to background levels within four hours, but the pulse magnitude did not increase in proportion to the amount of ammonium or nitrate added. In contrast to N2O, NO was emitted over 24 h and increased in proportion to ammonium addition, exceeding 600 ng N–NO m−2 s−1 in desert and chaparral soils. Isotope tracers suggest that both ammonia oxidation and nitrate reduction produced NO. Taken together, our measurements demonstrate that nitrate can be reduced within minutes of wetting summer-dry desert soils to produce large N2O emission pulses and that multiple processes contribute to long-lasting NO emissions. These mechanisms represent substantial pathways of ecosystem N loss that also contribute to regional air quality and global climate dynamics.

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“…This technique is convenient in terms of time, portability, and cost of materials; however, it results in a much lower time resolution (i.e., weeks to months) compared to active sampling techniques (i.e., hours to days), and collections under low RH conditions have been reported to be not quantitative. Additionally, previous studies have indicated that passive samplers can yield systematic biases in isotopic compositions for molecules such as NO 2 · and ammonia (NH 3 ) that is caused by diffusion and postcollection artifacts such as isotopic exchange with water and/or loss of the analyte after collection. ,− …”

Section: Introductionmentioning

confidence: 99%

Speciated Collection of Nitric Acid and Fine Particulate Nitrate for Nitrogen and Oxygen Stable Isotope Determination

2020

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Stable isotopic composition of atmospheric nitrate (nitric acid (HNO 3 ) + particulate nitrate (pNO 3 − )) provides a higher-order dimensional analysis of critical atmospheric components, enabling a process-level understanding of precursor emissions, oxidation chemistry, aerosol acidity, and depositional patterns. Current methods have not been evaluated for their ability to accurately speciate and determine nitrogen (δ 15 N) and oxygen (δ 18 O and Δ 17 O) isotope compositions for gaseous and particle phases. Suitability of a denuder-filter sampling system for the collection of speciated HNO 3(g) and pNO 3 − for off-line concentration and isotopic determination was tested using both laboratory and field collections. Honeycomb denuders coated with either NaCl or Na 2 CO 3 solutions were used to collect HNO 3(g) . Laboratory experiments found that both coating solutions quantitatively collected HNO 3(g) , with the Na 2 CO 3 solution demonstrating a higher operative capacity (>1470 μg of HNO 3 ; n = 25) compared to the NaCl solution (∼750 μg of HNO 3 ; n = 25). The precision values for laboratory-tested HNO 3(g) collections are ±0.6‰ and ±1.2‰ for δ 15 N and δ 18 O for the NaCl solution and ± 0.8‰ and ±1.2‰ for the Na 2 CO 3 solution. Replicate (urban) samples indicate that the Na 2 CO 3 solution is significantly less selective for HNO 3(g) collection than the NaCl solution. Nylon filters were found to collect efficiently and retain laboratorygenerated NaNO 3 and NH 4 NO 3 particles, with maximum standard deviations for δ 15 N and δ 18 O of ±0.3‰ and ±0.3‰, respectively. Field replicates, while predictably more variable, also show consistency for δ 15 N and δ 18 O of ±0.6‰ and ±1.3‰ for particulate species, respectively. Recommended methods for field collections of speciated HNO 3(g) and pNO 3 − for isotopic measurements would best utilize the NaCl solution and Nylon filters.

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Efficacy of passive sampler collection for atmospheric NO₂ isotopes under simulated environmental conditions

Cited by 6 publications

References 59 publications

Isotopic advances in understanding reactive nitrogen deposition and atmospheric processing

Isotopic advances in understanding reactive nitrogen deposition and atmospheric processing

Rapid nitrate reduction produces pulsed NO and N2O emissions following wetting of dryland soils

Speciated Collection of Nitric Acid and Fine Particulate Nitrate for Nitrogen and Oxygen Stable Isotope Determination

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Efficacy of passive sampler collection for atmospheric NO2 isotopes under simulated environmental conditions

Cited by 6 publications

References 59 publications

Isotopic advances in understanding reactive nitrogen deposition and atmospheric processing

Isotopic advances in understanding reactive nitrogen deposition and atmospheric processing

Rapid nitrate reduction produces pulsed NO and N2O emissions following wetting of dryland soils

Speciated Collection of Nitric Acid and Fine Particulate Nitrate for Nitrogen and Oxygen Stable Isotope Determination

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Efficacy of passive sampler collection for atmospheric NO₂ isotopes under simulated environmental conditions