Comparative evaluation of nitrogen oxides and ozone passive diffusion tubes for exposure studies

Vardoulakis, Sotiris; Lumbreras, Julio; Solazzo, Efisio

doi:10.1016/j.atmosenv.2009.02.048

Cited by 42 publications

(25 citation statements)

References 40 publications

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“…Previous studies have reported that the chemical reaction between O 3 and NO within diffusion tubes may result in an overestimation of NO 2 in urban environment (Heal and Cape, 1997;Heal et al, 1999); in addition, the lack of specificity of some absorbents used for NO 2 may cause the absorption of SO 2 which can reduce the collection efficiency of the sampler by acidifying those adsorbents (Cox, 2003). However, it has been impossible to establish generally applicable empirical correction factors as the concentrations of these gases vary both spatially and temporally (Vardoulakis et al, 2009).…”

Section: Quality Controlmentioning

confidence: 99%

“…In this study, all the samplers were co-located at the same atmospheric research stations in Singapore, the effects from meteorology were minimized by specially designed protective screens and shelters. The factors such as different materials of the tubes, non-consistent diffusion paths and areas for different samplers and various absorbent solutions applied may result in the variations of the measurement accuracy (Glasius et al, 1999;Kirby et al, 2000;Vardoulakis et al, 2009). In addition, it should be noted that the biases derived are associated with both sampling and analytical methods.…”

Section: Passive Sampling For Two Round Robin Tests In Singaporementioning

confidence: 99%

“…4 for NO 2 and SO 2 , and all three measured values for each sampler type are shown during 1 st and 2 nd round robin tests, respectively. The accuracy of the passive sampling was evaluated by using the relative bias (%), calculated from the relationship (Vardoulakis et al, 2009):…”

Section: Passive Sampling For Two Round Robin Tests In Singaporementioning

confidence: 99%

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Comparison of NO2 and SO2 Measurements Using Different Passive Samplers in Tropical Environment

Balasubramanian

et al. 2014

Aerosol Air Qual. Res.

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This report describes the results of an inter-comparison study conducted for the sampling and analysis of NO 2 and SO 2 by using different type of passive samplers in tropical urban environment. For this purpose, field experiments were proposed to be conducted by two round robin tests from Sept. 2007 to Aug. 2008 in Singapore. A set of different types of passive samplers have been exposed to ambient air at atmospheric research station in National University of Singapore along with suitable active samplers (as reference method) for a sufficient period of time (3-4 weeks). Annular denuder system (ADS) active sampling data showed that NO 2 concentration level (23.8-28.1 ppb) in Singapore was slightly higher than the WHO guideline but SO 2 concentration (12.5-14.9 ppb) was approximately twice the value of WHO guideline. For the two round robin tests, accuracy analysis by using active sampling data as reference demonstrated that grand mean values from passive air sampling (PAS) and active sampler average concentrations, for both NO 2 and SO 2 , are in close agreement with each other. Precision evaluation based on the triplicate samplers co-located at the same sampling siteSingapore showed that most of the passive samplers applied here had repeatability. ANOVA statistical analysis also showed no significant difference between the measurement data obtained by different type of passive samplers for both round robin tests in Singapore.

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Section: Quality Controlmentioning

confidence: 99%

Section: Passive Sampling For Two Round Robin Tests In Singaporementioning

confidence: 99%

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Comparison of NO2 and SO2 Measurements Using Different Passive Samplers in Tropical Environment

Balasubramanian

et al. 2014

Aerosol Air Qual. Res.

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“…Ainda, pelo fato de ser um método pouco oneroso e de fácil operação, pode ser usado para monitorar diversos pontos simultaneamente, identificando possíveis fontes de emissão em determinada área, e ser utilizado em períodos de tempo relativamente longos. Tal fato, aliado à interpolação de resultados, permite a obtenção de mapas que descrevem a distribuição espacial da poluição (KOT-WASIK et al, 2007;KUME et al, 2008;VARDOULAKIS et al, 2009).…”

Section: Amostragem Passivaunclassified

Os biocombustíveis no Brasil: panorama atual, emissões gasosas e os métodos analíticos de monitoramento da qualidade do ar referente a gases de natureza orgânica / Biofuels in Brazil: the current scene, gaseous emissions and analytical methods on air quality monitoring concerned to organic gases

Schirmer¹,

Gauer

2012

Ambiência

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ResumoA diminuição das reservas de petróleo, aliada às oscilações de seu preço e à pressão pela preservação do meio ambiente, evidenciam a necessidade de se diversificar a matriz energética mundial, por meio do uso de combustíveis renováveis. Grande parte da literatura referente a esse tema reporta, de fato, a redução significativa da grande maioria dos principais poluentes atmosféricos regulamentados. O presente trabalho aborda uma revisão do panorama dos biocombustíveis no Brasil (com ênfase no biodiesel), de modo sucinto, enfatizando os ganhos ambientais ao se substituir a matriz energética atual (predominantemente de origem fóssil), por combustíveis renováveis de origem vegetal. Traz ainda as principais técnicas de monitoramento no que se refere à amostragem e análise de gases orgânicos (especialmente compostos orgânicos voláteis), uma vez que compostos dessa natureza figuram entre os maiores poluentes do ar. Semelhantemente ao que se observa em âmbito internacional, a expectativa é de que, também no Brasil, ocorra um aumento no controle de fontes de poluentes dessa natureza, como a adoção de padrões de emissão mais rígidos (específicos para fontes de diferentes naturezas) e a inclusão de um programa de medida e controle/abatimento desses poluentes.Palavras-chave: biocombustíveis; biodiesel; monitoramento ambiental; qualidade do ar.

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“…Nevertheless, there are still many uncertainties in application of diffusive samplers to be accounted for (Cox 2003). For example, in the field, it is necessary to be aware of the effect of environmental conditions (such as wind, air temperature and relative humidity) and what abrupt changes in these conditions may have on the performance of diffusive samplers (Vardoulakis et al 2009). …”

Section: Introductionmentioning

confidence: 99%

Measurements of ground-level ozone in Czech mountain forests: what we have learnt from using diffusive samplers

Hůnová¹

2017

European Journal of Environmental Sciences

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Ground-level ozone (O 3 ) is a key atmospheric constituent participating in many important atmospheric reactions, and has many negative effects both on human health and the environment. We have measured O 3 ambient concentrations in four Czech rural areas of great natural value: the Orlické hory Mts., Novohradské hory Mts., České Švýcarsko and Jizerské hory Mts. For our measurement we used Ogawa diffusive samplers. The measurements were carried out during the vegetations seasons of 2004-2010, the samplers were exposed for two-weeks periods and the filters analyzed in the CHMI laboratory. The aim of this paper is to summarize the experience we have of using the diffusive sampling method in the field.

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Comparative evaluation of nitrogen oxides and ozone passive diffusion tubes for exposure studies

Cited by 42 publications

References 40 publications

Comparison of NO2 and SO2 Measurements Using Different Passive Samplers in Tropical Environment

Comparison of NO2 and SO2 Measurements Using Different Passive Samplers in Tropical Environment

Measurements of ground-level ozone in Czech mountain forests: what we have learnt from using diffusive samplers

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